廣告

2014年12月28日 星期日

[Java] difference between ProcessBuilder and Runtime.exec()

ref

http://desert3.iteye.com/blog/1596020

http://stackoverflow.com/questions/6856028/difference-between-processbuilder-and-runtime-exec

2014年12月4日 星期四

[Use github to show(deploy) your profile html page][使用github發布html網頁]

[作業系統window 7 ]

如果想簡單發佈一個個人簡介的網頁,

可以考慮用github。


step1. 在github local端create project ,命名方式 => your github name.github.io
           ex:cihm.github.io
































step2. 將你的網頁相關檔案放到你local端 你剛創的 github路徑。



























step3. commit and sync



step4, 網址列打上your github name.github.io
           ex:http://cihm.github.io/

























樣本網路上有很多種,
可以參考
http://html5up.net/

他們都是響應式網頁設計(Responsive web design,通常縮寫為RWD,
也就是可以自適應各種裝置的大小。




2014年12月1日 星期一

[WebService _ first project_ use eclipse,tomcat][第一個專案(Hello World)使用tomcat and eclipse]

download tomcat7 ,
1.使用者變數JAVA_HOME ===> C:\Program Files (x86)\Java\jdk1.7.0_06
系統變數 path ===>C:%JAVA_HOME%\bin
2.啟動 tomcat => cmd=> cd C:\Program Files\apache-tomcat-7.0.56\bin , startup
3.在網址列打上 http://127.0.0.1:8080/ (管理介面)
4.設定Tomcat目錄下的conf資料夾內的tomcat-users.xml
 <role rolename="manager-gui"/> <user username="lewis" password="lewis" roles="manager-gui"/>
===============================================================================

eclipse基本流程

  1. Servlet網站的Project類型是Dynamic Web Project。
  2. 可以在Web.xml裡面設定Servlet對應路徑等,這邊勾選的"Generate web.xml deployment descriptor"指的就是那個xml(也叫做Deployment Descriptor)
  3. 增加一個Servlet,對新建的project點右鍵選New->Servlet:
  4. 預設URL Mapping是對應到和這個Servlet名稱一樣(這個例子是HelloWorld),可以修改Pattern
  5. 設定Target Runtime
    如果沒有設定Target Runtime這個時候Servlet沒有辦法Build。因為會需要Servlet相關物件,因此需要加入對應的實作class。使用Tomcat,所以要先把他加入才可以。
    先加一個Tomcat的Server。在View 「Servers」裡面選擇新增,並且選Tomcat 7(路徑同上一篇)
  6. 最後需要把那個Server的class加進去。對Project點右鍵「Properties」找到"Java Build Path"選擇"Add Library"選"Server Runtime"
  7. 增加get顯示頁面
    回到「HelloWorld.java」,設定doGet()的內容:
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws
        ServletException, IOException {
            // TODO Auto-generated method stub      
            response.setCharacterEncoding("UTF-8");
        request.setCharacterEncoding("UTF-8");

        String requestUri = request.getRequestURI();

        response.setContentType("text/html");
        PrintWriter out = response.getWriter();

        out.println("<!DOCTYPE html>");
        out.println("<html>");
        out.println("<head>");
        out.println("<title>Hello world</title>");
        out.println("</head>");
        out.println("<body>");
        out.println("Hello World from frisrt servlet");

        out.println("<form action='" + requestUri + "' method='post'>");
        out.println("<input type='text' name='name' />");
        out.println("<input type='submit' value='submit' />");
        out.println("</form>");

        out.println("</body>");
        out.println("</html>");

        out.flush();
        out.close();

    }
增加post顯示頁面
這邊是把輸入的東西在顯示出來:
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws
        ServletException, IOException {
            // TODO Auto-generated method stub
        response.setCharacterEncoding("UTF-8");
        request.setCharacterEncoding("UTF-8");

        String name = request.getParameter("name");


        response.setContentType("text/html");
        PrintWriter out = response.getWriter();

               out.println("<!DOCTYPE html>");
        out.println("<html>");
        out.println("<head>");
        out.println("<title>Hello world</title>");
        out.println("</head>");
        out.println("<body>");

        out.println("Hello: " + name);

        out.println("</body>");
        out.println("</html>");

        out.flush();
        out.close();
    }
把Server Start起來以後,可以再IE直接輸入: http://localhost/ServletSample/TestServlet
2

===============================================================================

設定Servlet連接

如何把一個Servlet從另一個Servlet區分呢?

  1. 靠設定檔。
  2. Servlet 3.0後增加了@WebServlet 標註功能
  3. java reflection and invoke

1. 靠設定檔

基本上會有一個Web.xml檔案(或者可以用annotation的方式設定),告訴我們的Container(Tomcat)當某一個路徑進來的時候,呼叫哪一個Servlet來處理。

servlet

這裡面的設定比較像servlet的對應。
這個裡面一定會有包含兩個element:
servlet-name:表示代表這個servlet的名字,方便其他部份reference。在整個web.xml是不可以重複的。
servlet-class:代表著這個servlet的Class名稱。這邊需要Fully Qualified Name, 也就是包含package名稱
那servlet下面還可以代入預設參數。這個意思是,我們可以再處理request的時候,透過getInitParameter()的方式讀取一些預設在這邊的參數。
格式是init-para表示一個參數,而其下面則是param-name和param-value代表著key, Value。
servlet設定範例
<servlet>
    <servlet-name>Log4JInitServlet</servlet-name>
    <servlet-class>com.ws.controller.Log4JInitServlet</servlet-class>
     <init-param>
      <param-name>log4j-properties-location</param-name>
      <param-value>/WEB-INF/properties/log4j.properties</param-value>
     </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

servlet-mapping

這個部份是要設定什麼路徑使用什麼Servlet。
有兩個基本element:
servlet-name:那一個servlet要對應到(上面設定servlet-name的對應)
url-pattern:相對路徑下面所要對應。
servlet-mapping設定範例
    <servlet-mapping>
      <servlet-name>Log4JInitServlet</servlet-name>
      <url-pattern>/Log4JInitServlet</url-pattern>
    </servlet-mapping>
表示只要url進來對應為/Log4JInitServlet,就使用在servlet定義的那個servlet-class作為處理的object。

2. Servlet 3.0後增加了@WebServlet 標註功能

Servlet 3.0後增加了@WebServlet 標註功能
只要Servlet上有這行標註,container就會自動讀取資訊
範例中的標註指的是這支Servlet會處理經由 /Log4JInitServlet這個虛擬路徑來的HTTP請求
@WebServlet標籤還能透過參數做更多的設定:
@WebServlet(name="Log4JInitServlet", urlPatterns={"/Log4JInitServlet"}, loadOnStartup=1)

1 and 2 's result

  • 所以將標註當成預設值,web.xml進行管理也是可以的
  • 設定的套用順序會是 標註 -> web.xml

3. java reflection and invoke

   
  • 之後再補充這部分


===============================================================================

Deploy web service


[1]use tomcat manager to load XXX,war , xxx is your project be exported

3

[2] 在C:\Program Files (x86)\apache-tomcat-7.0.56\webapps 下創建一個資料夾,

"結構 如附圖" or eclipse
WEB-INF底下必須放置名為 web.xml的部屬描述檔
META-INF下的MANIFEST.MF宣告程式庫的相依性
有需要再設定即可,一般不用管它
ib資料夾底下放置會被引用到web application的JAR檔
web application使用類別時,會先到classes裡尋找是否有該類別檔案
如果沒有就再到container實作中放classes檔的地方或lib目錄底下尋找
4


[Web Service Introuction ][初探&介紹]

Servlet生命週期簡單的概括分為四步:class加載實例化--->初始化--->服務--->銷毀。

Servlet生命週期是由javax.servlet.Servlet接口定義,所有的Servlet都必須實現這個接口。在Servlet接口中定義了5個方法,其中3個方法代表了Servlet的生命周期:
  1. init方法:負責初始化Servlet對象。
  2. service方法:負責回應客戶的請求。
  3. destroy方法:當Servlet對象退出生命週期時,負責釋放佔用的資源。
  servlet_lifecycle

1、加載(Load)和實例化(Instantiated)

   Servlet容器負責加載和實例化Servlet。因為容器是通過Java的反射API來創建Servlet實例,調用的是Servlet的默認構造方法(即不帶參數的構造方法),所以我們在編寫Servlet類的時候,不應該提供帶參數的構造方法。 Servlet容器加載Servlet,有以下幾種情況:
(1)、Servlet容器啟動時自動裝載Servlet,讀取配置文件web.XML文件中的屬性,如果為1,則容器啟動時加載Servlet.
(2)、在Servlet容器啟動後,客戶首次向Servlet發送請求。 Servlet容器會判斷內存中是否存在指定的Servlet對象,如果沒有則加載這個Servlet。
(3)、Servlet類文件被更新後,重新加載Servlet.

2、初始化階段:init(ServletConfig conf)(補充)

   在Servlet實例化之後,Servlet容器將調用Servlet的init()方法初始化這個對象。初始化的目的是為了讓Servlet對像在處理客戶端請求前完成一些初始化的工作,如建立數據庫的連接,獲取配置信息等。對於每一個Servlet實例,init()方法只被調用一次。在初始化期間,Servlet實例可以使用Servlet容器為它準備的ServletConfig對像從Web應用程序的配置信息(在web.xml中配置)中獲取初始化的參數信息。
   在初始化期間,如果發生錯誤,Servlet實例可以拋出ServletException異常或者UnavailableException異常來通知容器。 ServletException異常用於指明一般的初始化失敗,例如沒有找到初始化參數;而UnavailableException異常用於通知容器該Servlet實例不可用。例如,數據庫服務器沒有啟動,數據庫連接無法建立,Servlet就可以拋出UnavailableException異常向容器指出它暫時或永久不可用。

3、回應請求服務階段(service)

   Servlet 被初始化以後,就處於能回應請​​求的就緒狀態。在service()方法中,Servlet實例通過ServletRequest對象得到​​客戶端的相關信息和請求信息,在對請求進行處理後,調用ServletResponse對象的方法設置回應訊息。當客戶端有一個請求時,Servlet容器將ServletRequest 和ServletResponse對像都轉發給Servlet,這兩個對像以參數的形式傳給service方法。這個方法由javax.servlet.Servlet定義並由具體的Servlet 實現。
   注意:客戶端每次請求Servlet都會運行該方法,該方法判斷訪問類型,然後根據HttpServletRequest的getMethod()方法返回結果判斷是執行doGet還是doPost,doPut。而且無論請求多少次Servlet,最多只有一個Servlet實例。多個客戶端並發請求Servlet時,服務器會啟動多個線程分別執行該Servlet的service()方法。
   在service()方法執行期間,如果發生錯誤,Servlet實例可以拋出ServletException異常或者UnavailableException異常。如果UnavailableException異常指示了該實例永久不可用,Servlet容器將調用實例的destroy()方法,釋放該實例。此後對該實例的任何請求,都將收到容器發送的HTTP 404(請求的資源不可用)回應。如果UnavailableException異常指示了該實例暫時不可用,那麼在暫時不可用的時間段內,對該實例的任何請求,都將收到容器發送的HTTP 503(服務器暫時忙,不能處理請求)回應。

4、終止服務階段(destroy)

   當需要釋放內存或者容器關閉時,容器就會調用Servlet實例的destroy()方法。在destroy()方法調用之後,容器會釋放這個Servlet實例,該實例隨後會被Java的垃圾收集器所回收。如果再次需要這個Servlet處理請求,Servlet容器會創建一個新的Servlet實例。

小結:

   在整個Servlet的生命週期過程中,創建Servlet實例、調用實例的init()和destroy()方法都只進行一次,當初始化完成後,Servlet容器會將該實例保存在內存中,通過調用它的service()方法,為接收到的請求服務。 Servlet有時會用到一些需要初始化與銷毀的資源,因此可以把初始化資源的代碼放入init()方法內,把銷毀資源的代碼放入destroy方法內,而不需要每次處理請求都要初始化與銷毀資源。






補充=====================================================================
when Servlet init() load 
http://guoliangqi.iteye.com/blog/667258



=======================================================================


image 13

Servlet/JSP處理HTTP請求的過程是:

  1. 使用者對Web Server發出HTTP請求
  2. Server收到請求後將其轉給container,並由container分析請求內容後建立相對應的物件
  3. container根據請求裡的URL分配給正確的Servlet 並為這個請求建立或配制執行緒,以及將請求物件與回應物件交予該執行緒處理
  4. container呼叫Servlet的sevice() method 根據請求的類別,service()會再呼叫doGet()或doPost() method
  5. 接著由所呼叫的method建置動態網頁,並將它放入回應物件裡
  6. 執行緒結束,container轉換回應物件為HTTP回應傳回Client端 接著刪除請求與回應物件



2014年11月30日 星期日

[Android 顯示從網路下載的圖片][Android show picture from url]

常常會用到即時從網路下載圖片,並顯示於原件上。
下載圖片的方式有很多種,這邊用AsyncTask 搭配 http GET的方式顯示
圖片在imageView上,(可以自行將imageView 改成其他元件,grid, list等等)。










































範例:


import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.Toast;

public class Lewis extends Activity {
 private ImageView imageView;
 private ProgressDialog simpleWaitDialog;
 private final static String url = "http://i.imgur.com/pJv6ccq.jpg";

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  imageView = (ImageView) findViewById(R.id.imageView);
  new DownloadImage().execute(url); 
 }

 private class DownloadImage extends AsyncTask {
  @Override
  protected Bitmap doInBackground(String... param) {
   return downloadBitmap(param[0]);
  }

  @Override
  protected void onPreExecute() {
   simpleWaitDialog = ProgressDialog.show(
     Lewis.this, "Wait",
     "Downloading Image");
  }

  protected void onPostExecute(Bitmap result) {
   imageView.setImageBitmap(result);
   simpleWaitDialog.dismiss();

  }

  private Bitmap downloadBitmap(String url) {
   final DefaultHttpClient client = new DefaultHttpClient();
   final HttpGet getRequest = new HttpGet(url);
   try {
    HttpResponse response = client.execute(getRequest);
    final int statusCode = response.getStatusLine().getStatusCode();
    if (statusCode != HttpStatus.SC_OK) {
     return null;
    }
    final HttpEntity entity = response.getEntity();
    if (entity != null) {
     InputStream inputStream = null;
     try {
      inputStream = entity.getContent();
      final Bitmap bitmap = BitmapFactory
        .decodeStream(inputStream);
      
      return bitmap;
      
     } finally {
      if (inputStream != null) {
       inputStream.close();
      }
      entity.consumeContent();
     }
    }
   } catch (Exception e) {

    getRequest.abort();
   }
   return null;
  }
 }
}

2014年11月29日 星期六

[Android_ColorPicker_Dialog][Android_調色盤_用dialog方式]






















將以下程式加入貼到專案中。

import android.app.Dialog;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.SweepGradient;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;

public class ColorPickerDialog extends Dialog {
 private final boolean debug = true;
 private final String TAG = "ColorPicker";
 
 Context context;
 private String title;
 private int mInitialColor;
    private OnColorChangedListener mListener;

 
    public ColorPickerDialog(Context context, String title, 
      OnColorChangedListener listener) {
     this(context, Color.BLACK, title, listener);
    }
    
  
    public ColorPickerDialog(Context context, int initialColor, 
      String title, OnColorChangedListener listener) {
        super(context);
        this.context = context;
        mListener = listener;
        mInitialColor = initialColor;
        this.title = title;
        
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        WindowManager manager = getWindow().getWindowManager();
  int height = (int) (manager.getDefaultDisplay().getHeight() * 0.5f);
  int width = (int) (manager.getDefaultDisplay().getWidth() * 0.7f);
  ColorPickerView myView = new ColorPickerView(context, height, width);
        setContentView(myView);
        setTitle(title);
    }
    
    private class ColorPickerView extends View {
     private Paint mPaint;
     private Paint mCenterPaint;
     private Paint mLinePaint;
     private Paint mRectPaint;
     
     private Shader rectShader;
     private float rectLeft;
     private float rectTop;
     private float rectRight;
     private float rectBottom;
        
     private final int[] mCircleColors;
     private final int[] mRectColors;
     
     private int mHeight;
     private int mWidth;
     private float r;
     private float centerRadius;
     
     private boolean downInCircle = true;
     private boolean downInRect;
     private boolean highlightCenter;
     private boolean highlightCenterLittle;
     
  public ColorPickerView(Context context, int height, int width) {
   super(context);
   this.mHeight = height - 36;
   this.mWidth = width;
   setMinimumHeight(height - 36);
   setMinimumWidth(width);
   
   
      mCircleColors = new int[] {0xFFFF0000, 0xFFFF00FF, 0xFF0000FF, 
        0xFF00FFFF, 0xFF00FF00,0xFFFFFF00, 0xFFFF0000};
      Shader s = new SweepGradient(0, 0, mCircleColors, null);
            mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
            mPaint.setShader(s);
            mPaint.setStyle(Paint.Style.STROKE);
            mPaint.setStrokeWidth(50);
            r = width / 2 * 0.7f - mPaint.getStrokeWidth() * 0.5f;
            
           
            mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
            mCenterPaint.setColor(mInitialColor);
            mCenterPaint.setStrokeWidth(5);
            centerRadius = (r - mPaint.getStrokeWidth() / 2 ) * 0.7f;
            
            
            mLinePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
            mLinePaint.setColor(Color.parseColor("#72A1D1"));
            mLinePaint.setStrokeWidth(4);
            
        
            mRectColors = new int[]{0xFF000000, mCenterPaint.getColor(), 0xFFFFFFFF};
            mRectPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
            mRectPaint.setStrokeWidth(5);
            rectLeft = -r - mPaint.getStrokeWidth() * 0.5f;
            rectTop = r + mPaint.getStrokeWidth() * 0.5f + 
              mLinePaint.getStrokeMiter() * 0.5f + 15;
            rectRight = r + mPaint.getStrokeWidth() * 0.5f;
            rectBottom = rectTop + 50;
  }

  @Override
  protected void onDraw(Canvas canvas) {
            canvas.translate(mWidth / 2, mHeight / 2 - 50);
            canvas.drawCircle(0, 0, centerRadius,  mCenterPaint);
            if (highlightCenter || highlightCenterLittle) {
                int c = mCenterPaint.getColor();
                mCenterPaint.setStyle(Paint.Style.STROKE);
                if(highlightCenter) {
                 mCenterPaint.setAlpha(0xFF);
                }else if(highlightCenterLittle) {
                 mCenterPaint.setAlpha(0x90);
                }
                canvas.drawCircle(0, 0, 
                  centerRadius + mCenterPaint.getStrokeWidth(),  mCenterPaint);
                
                mCenterPaint.setStyle(Paint.Style.FILL);
                mCenterPaint.setColor(c);
            }
            canvas.drawOval(new RectF(-r, -r, r, r), mPaint);
            if(downInCircle) {
             mRectColors[1] = mCenterPaint.getColor();
            }
            rectShader = new LinearGradient(rectLeft, 0, rectRight, 0, mRectColors, null, Shader.TileMode.MIRROR);
            mRectPaint.setShader(rectShader);
            canvas.drawRect(rectLeft, rectTop, rectRight, rectBottom, mRectPaint);
            float offset = mLinePaint.getStrokeWidth() / 2;
            canvas.drawLine(rectLeft - offset, rectTop - offset * 2, 
              rectLeft - offset, rectBottom + offset * 2, mLinePaint);
            canvas.drawLine(rectLeft - offset * 2, rectTop - offset, 
              rectRight + offset * 2, rectTop - offset, mLinePaint);
            canvas.drawLine(rectRight + offset, rectTop - offset * 2, 
              rectRight + offset, rectBottom + offset * 2, mLinePaint);
            canvas.drawLine(rectLeft - offset * 2, rectBottom + offset, 
              rectRight + offset * 2, rectBottom + offset, mLinePaint);
   super.onDraw(canvas);
  }
  
  @Override
  public boolean onTouchEvent(MotionEvent event) {
   float x = event.getX() - mWidth / 2;
            float y = event.getY() - mHeight / 2 + 50;
            boolean inCircle = inColorCircle(x, y, 
              r + mPaint.getStrokeWidth() / 2, r - mPaint.getStrokeWidth() / 2);
            boolean inCenter = inCenter(x, y, centerRadius);
            boolean inRect = inRect(x, y);
            
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                 downInCircle = inCircle;
                 downInRect = inRect;
                 highlightCenter = inCenter;
                case MotionEvent.ACTION_MOVE:
                 if(downInCircle && inCircle) {
                  float angle = (float) Math.atan2(y, x);
                        float unit = (float) (angle / (2 * Math.PI));
                        if (unit < 0) {
                            unit += 1;
                        }
                  mCenterPaint.setColor(interpCircleColor(mCircleColors, unit));
                  if(debug) Log.v(TAG, ": " + x + "," + y);
                 }else if(downInRect && inRect) {
                  mCenterPaint.setColor(interpRectColor(mRectColors, x));
                 }
                 if(debug) Log.v(TAG, "[MOVE] : " + highlightCenter + ": " + highlightCenterLittle + " : " + inCenter);
                 if((highlightCenter && inCenter) || (highlightCenterLittle && inCenter)) {
                  highlightCenter = true;
                  highlightCenterLittle = false;
                 } else if(highlightCenter || highlightCenterLittle) {
                  highlightCenter = false;
                  highlightCenterLittle = true;
                 } else {
                  highlightCenter = false;
                  highlightCenterLittle = false;
                 }
                    invalidate();
                 break;
                case MotionEvent.ACTION_UP:
                 if(highlightCenter && inCenter) {
                  if(mListener != null) {
                   mListener.colorChanged(mCenterPaint.getColor());
                      ColorPickerDialog.this.dismiss();
                  }
                 }
                 if(downInCircle) {
                  downInCircle = false;
                 }
                 if(downInRect) {
                  downInRect = false;
                 }
                 if(highlightCenter) {
                  highlightCenter = false;
                 }
                 if(highlightCenterLittle) {
                  highlightCenterLittle = false;
                 }
                 invalidate();
                    break;
            }
            return true;
  }

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
   super.onMeasure(mWidth, mHeight);
  }

 
  private boolean inColorCircle(float x, float y, float outRadius, float inRadius) {
   double outCircle = Math.PI * outRadius * outRadius;
   double inCircle = Math.PI * inRadius * inRadius;
   double fingerCircle = Math.PI * (x * x + y * y);
   if(fingerCircle < outCircle && fingerCircle > inCircle) {
    return true;
   }else {
    return false;
   }
  }
  
 
  private boolean inCenter(float x, float y, float centerRadius) {
   double centerCircle = Math.PI * centerRadius * centerRadius;
   double fingerCircle = Math.PI * (x * x + y * y);
   if(fingerCircle < centerCircle) {
    return true;
   }else {
    return false;
   }
  }
  
 
  private boolean inRect(float x, float y) {
   if( x <= rectRight && x >=rectLeft && y <= rectBottom && y >=rectTop) {
    return true;
   } else {
    return false;
   }
  }
  
  
  private int interpCircleColor(int colors[], float unit) {
            if (unit <= 0) {
                return colors[0];
            }
            if (unit >= 1) {
                return colors[colors.length - 1];
            }
            
            float p = unit * (colors.length - 1);
            int i = (int)p;
            p -= i;

            // now p is just the fractional part [0...1) and i is the index
            int c0 = colors[i];
            int c1 = colors[i+1];
            int a = ave(Color.alpha(c0), Color.alpha(c1), p);
            int r = ave(Color.red(c0), Color.red(c1), p);
            int g = ave(Color.green(c0), Color.green(c1), p);
            int b = ave(Color.blue(c0), Color.blue(c1), p);
          //  Log.e("colort2222", Integer.toString(Color.argb(a, r, g, b)));
            return Color.argb(a, r, g, b);
        }
  
  
  private int interpRectColor(int colors[], float x) {
   int a, r, g, b, c0, c1;
         float p;
         if (x < 0) {
          c0 = colors[0]; 
          c1 = colors[1];
          p = (x + rectRight) / rectRight;
         } else {
          c0 = colors[1];
          c1 = colors[2];
          p = x / rectRight;
         }
         a = ave(Color.alpha(c0), Color.alpha(c1), p);
         r = ave(Color.red(c0), Color.red(c1), p);
         g = ave(Color.green(c0), Color.green(c1), p);
         b = ave(Color.blue(c0), Color.blue(c1), p);
         return Color.argb(a, r, g, b);
  }
  
  private int ave(int s, int d, float p) {
            return s + Math.round(p * (d - s));
        }
    }
    
    
    public interface OnColorChangedListener {
     
        void colorChanged(int color);
    }
    
    public String getTitle() {
  return title;
 }

 public void setTitle(String title) {
  this.title = title;
 }

 public int getmInitialColor() {
  return mInitialColor;
 }

 public void setmInitialColor(int mInitialColor) {
  this.mInitialColor = mInitialColor;
 }

 public OnColorChangedListener getmListener() {
  return mListener;
 }

 public void setmListener(OnColorChangedListener mListener) {
  this.mListener = mListener;
 }
}




用法:在你要改顏色地方加入以下程式碼。
AlertDialog.Builder editDialog = new AlertDialog.Builder(DragListActivity.this);
editDialog.setTitle("pick color");

 dialog = new ColorPickerDialog(mContext, tempColor, "11",
 new ColorPickerDialog.OnColorChangedListener() {
   public void colorChanged(int color2) 
   {
    //set your color variable
   }
 });
 dialog.show();



[Android Animation _use extends Animation_3DFlip ][Android 讓layout有動畫_用extends Animation的方式_3D翻頁效果 ]

這篇用extends Animation 來做特效。

先將以下程式加入專案。


public class Flip3dAnimation extends Animation {
 private final float mFromDegrees;
 private final float mToDegrees;
 private final float mCenterX;
 private final float mCenterY;
 private Camera mCamera;

 public Flip3dAnimation(float fromDegrees, float toDegrees, float centerX,
   float centerY) {
  mFromDegrees = fromDegrees;
  mToDegrees = toDegrees;
  mCenterX = centerX;
  mCenterY = centerY;
 }

 @Override
 public void initialize(int width, int height, int parentWidth,
   int parentHeight) {
  super.initialize(width, height, parentWidth, parentHeight);
  mCamera = new Camera();
 }

 @Override
 protected void applyTransformation(float interpolatedTime, Transformation t) {
  final float fromDegrees = mFromDegrees;
  float degrees = fromDegrees
    + ((mToDegrees - fromDegrees) * interpolatedTime);

  final float centerX = mCenterX;
  final float centerY = mCenterY;
  final Camera camera = mCamera;

  final Matrix matrix = t.getMatrix();

  camera.save();

  camera.rotateY(degrees);

  camera.getMatrix(matrix);
  camera.restore();

  matrix.preTranslate(-centerX, -centerY);
  matrix.postTranslate(centerX, centerY);

 }

}



使用方法:

如果你是要點擊按鈕或item以後轉跳畫面,想要等動畫跑完再轉跳畫面,可以用以下方法,
600代表0.6秒後再轉跳畫面


final float centerX = view.getWidth() / 2.0f;
final float centerY = view.getHeight() / 2.0f;
final Flip3dAnimation rotation =  new Flip3dAnimation(0, 90, centerX, centerY);
rotation.setDuration(500);
rotation.setFillAfter(true);
rotation.setInterpolator(new AccelerateInterpolator());
              
view.startAnimation(rotation);
               
view.postDelayed(new Runnable() {
                   
          public void run() {                
            //do things here            
          }
},600);

[Android Animation _use xml][Android 讓layout有動畫_用xml的方式 ]

將動畫的xml檔寫如下的資料夾中























範例:
這邊用兩段式動畫當例子。

animSlide_up = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.slide_up); 
layout_login.setAnimation(animSlide_up);
layout_login.setVisibility(View.GONE); 

animSlide_down = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.slide_down); 
layout_after_login.setAnimation(animSlide_down);
layout_after_login.setVisibility(View.VISIBLE);



fade_in.xml
<?xml version="1.0" encoding="utf-8"?>
    android:fillAfter="true" >
    <alpha
        android:duration="1000"
        android:fromAlpha="0.0"
        android:interpolator="@android:anim/accelerate_interpolator"
        android:toAlpha="1.0" />
</set>

fade_out.xml
<?xml version="1.0" encoding="utf-8"?>
    android:fillAfter="true" >
    <alpha
        android:duration="1000"
        android:fromAlpha="1.0"
        android:interpolator="@android:anim/accelerate_interpolator"
        android:toAlpha="0.0" />
</set>
blink.xml
<?xml version="1.0" encoding="utf-8"?>
    <alpha android:fromAlpha="0.0"
        android:toAlpha="1.0"
        android:interpolator="@android:anim/accelerate_interpolator"
        android:duration="600"
        android:repeatMode="reverse"
        android:repeatCount="infinite"/>
</set>
zoom_in.xml
<?xml version="1.0" encoding="utf-8"?>
    android:fillAfter="true" >
    <scale
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:duration="1000"
        android:fromXScale="1"
        android:fromYScale="1"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toXScale="3"
        android:toYScale="3" >
    </scale>
</set>
zoom_out.xml
<?xml version="1.0" encoding="utf-8"?>
    android:fillAfter="true" >
    <scale
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:duration="1000"
        android:fromXScale="1.0"
        android:fromYScale="1.0"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toXScale="0.5"
        android:toYScale="0.5" >
    </scale>
</set>
rotate.xml
<?xml version="1.0" encoding="utf-8"?>
    <rotate android:fromDegrees="0"
        android:toDegrees="360"
        android:pivotX="50%"
        android:pivotY="50%"
        android:duration="600"
        android:repeatMode="restart"
        android:repeatCount="infinite"
        android:interpolator="@android:anim/cycle_interpolator"/>
</set>
move.xml
<?xml version="1.0" encoding="utf-8"?>
<set
    android:interpolator="@android:anim/linear_interpolator"
    android:fillAfter="true">
   <translate
        android:fromXDelta="0%p"
        android:toXDelta="75%p"
        android:duration="800" />
</set>
slide_up.xml
<?xml version="1.0" encoding="utf-8"?>
    android:fillAfter="true" >
    <scale
        android:duration="500"
        android:fromXScale="1.0"
        android:fromYScale="1.0"
        android:interpolator="@android:anim/linear_interpolator"
        android:toXScale="1.0"
        android:toYScale="0.0" />
</set>
slide_down.xml
<?xml version="1.0" encoding="utf-8"?>
    android:fillAfter="true">
    <scale
        android:duration="500"
        android:fromXScale="1.0"
        android:fromYScale="0.0"
        android:interpolator="@android:anim/linear_interpolator"
        android:toXScale="1.0"
        android:toYScale="1.0" />
</set>
bounce.xml
<?xml version="1.0" encoding="utf-8"?>
    android:fillAfter="true"
    android:interpolator="@android:anim/bounce_interpolator">
    <scale
        android:duration="500"
        android:fromXScale="1.0"
        android:fromYScale="0.0"
        android:toXScale="1.0"
        android:toYScale="1.0" />
</set>
sequential.xml
<?xml version="1.0" encoding="utf-8"?>
    android:fillAfter="true"
    android:interpolator="@android:anim/linear_interpolator" >
    <!-- Use startOffset to give delay between animations -->
    <!-- Move -->
    <translate
        android:duration="800"
        android:fillAfter="true"
        android:fromXDelta="0%p"
        android:startOffset="300"
        android:toXDelta="75%p" />
    <translate
        android:duration="800"
        android:fillAfter="true"
        android:fromYDelta="0%p"
        android:startOffset="1100"
        android:toYDelta="70%p" />
    <translate
        android:duration="800"
        android:fillAfter="true"
        android:fromXDelta="0%p"
        android:startOffset="1900"
        android:toXDelta="-75%p" />
    <translate
        android:duration="800"
        android:fillAfter="true"
        android:fromYDelta="0%p"
        android:startOffset="2700"
        android:toYDelta="-70%p" />
    <!-- Rotate 360 degrees -->
    <rotate
        android:duration="1000"
        android:fromDegrees="0"
        android:interpolator="@android:anim/cycle_interpolator"
        android:pivotX="50%"
        android:pivotY="50%"
        android:startOffset="3800"
        android:repeatCount="infinite"
        android:repeatMode="restart"
        android:toDegrees="360" />
</set>
together.xml
<?xml version="1.0" encoding="utf-8"?>
    android:fillAfter="true"
    android:interpolator="@android:anim/linear_interpolator" >
    <scale
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:duration="4000"
        android:fromXScale="1"
        android:fromYScale="1"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toXScale="4"
        android:toYScale="4" >
    </scale>
    <!-- Rotate 180 degrees -->
    <rotate
        android:duration="500"
        android:fromDegrees="0"
        android:pivotX="50%"
        android:pivotY="50%"
        android:repeatCount="infinite"
        android:repeatMode="restart"
        android:toDegrees="360" />
</set>


裡面的參數請自行微調。

最後副上一個也還不錯的animation lib

https://github.com/dkmeteor/ActivityAnimationLib

最近又有更新:http://developer.android.com/training/animation/cardflip.html