Android SurfaceView 透明和半透明

透明//Transparent半透明//Translucent

package rw.Trans;import android.app.Activity;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.PixelFormat;import android.os.Bundle;import android.view.MotionEvent;import android.view.SurfaceHolder;import android.view.SurfaceHolder.Callback;import android.view.SurfaceView;public class TransParentActivity extends Activity {    /** Called when the activity is first created. */class MySurfaceView extends SurfaceView implements Callback{        float left,top;        Bitmap bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.reen);public MySurfaceView(Context context) {super(context);// TODO Auto-generated constructor stubgetHolder().setFormat(PixelFormat.TRANSPARENT);//設定為透明//getHolder().setFormat(PixelFormat.TRANSLUCENT);//半透明getHolder().addCallback(this);setFocusable(true);}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {// TODO Auto-generated method stub}@Overridepublic void surfaceCreated(SurfaceHolder holder) {// TODO Auto-generated method stub doDraw();}private void doDraw() {// TODO Auto-generated method stubCanvas canvas=getHolder().lockCanvas();canvas.drawBitmap(bitmap, left, top, null);getHolder().unlockCanvasAndPost(canvas);}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {// TODO Auto-generated method stub}/* (non-Javadoc) * @see android.app.Activity#onTouchEvent(android.view.MotionEvent) */@Overridepublic boolean onTouchEvent(MotionEvent event) {// TODO Auto-generated method stubleft=event.getX();top=event.getY();doDraw();return super.onTouchEvent(event);}}    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(new MySurfaceView(getApplicationContext()));            }}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="rw.Trans"      android:versionCode="1"      android:versionName="1.0">    <uses-sdk android:minSdkVersion="10" />
    <application android:icon="@drawable/icon" android:label="@string/app_name">        <activity android:name=".TransParentActivity"                  android:label="Transparent SurfaceView"                  android:theme="@android:style/Theme.Translucent"                  >
                              <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>
    </application></manifest>