Android SurfaceView 透明和半透明

1. <span >透明//Transparent
2. 半透明//Translucent</span>

1. package rw.Trans;
3. import Android.app.Activity;
4. import android.content.Context;
5. import android.graphics.Bitmap;
6. import android.graphics.BitmapFactory;
7. import android.graphics.Canvas;
8. import android.graphics.PixelFormat;
9. import android.os.Bundle;
10. import android.view.MotionEvent;
11. import android.view.SurfaceHolder;
12. import android.view.SurfaceHolder.Callback;
13. import android.view.SurfaceView;
15. public class TransParentActivity extends Activity {
16. /** Called when the activity is first created. */
17. class MySurfaceView extends SurfaceView implements Callback{
18. float left,top;
19. Bitmap bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.reen);
20. public MySurfaceView(Context context) {
21. super(context);
22. // TODO Auto-generated constructor stub
23. <span style="color:#ff0000;">getHolder().setFormat(PixelFormat.TRANSPARENT);//設置為透明
24. //getHolder().setFormat(PixelFormat.TRANSLUCENT);//半透明</span>
25. getHolder().addCallback(this);
26. setFocusable(true);
27. }
29. @Override
30. public void surfaceChanged(SurfaceHolder holder, int format, int width,
31. int height) {
32. // TODO Auto-generated method stub
34. }
36. @Override
37. public void surfaceCreated(SurfaceHolder holder) {
38. // TODO Auto-generated method stub
39. doDraw();
40. }
42. private void doDraw() {
43. // TODO Auto-generated method stub
44. Canvas canvas=getHolder().lockCanvas();
45. canvas.drawBitmap(bitmap, left, top, null);
46. getHolder().unlockCanvasAndPost(canvas);
47. }
49. @Override
50. public void surfaceDestroyed(SurfaceHolder holder) {
51. // TODO Auto-generated method stub
53. }
55. /* (non-Javadoc)
56. * @see android.app.Activity#onTouchEvent(android.view.MotionEvent)
57. */
58. @Override
59. public boolean onTouchEvent(MotionEvent event) {
60. // TODO Auto-generated method stub
61. left=event.getX();
62. top=event.getY();
63. doDraw();
65. return super.onTouchEvent(event);
66. }
67. }
68. @Override
69. public void onCreate(Bundle savedInstanceState) {
70. super.onCreate(savedInstanceState);
71. setContentView(new MySurfaceView(getApplicationContext()));
73. }
75. }

AndroidManifest.xml

1. <p><?xml version="1.0" encoding="utf-8"?>
2. <manifest xmlns:android="<a href="http://schemas.android.com/apk/res/android">http://schemas.android.com/apk/res/android</a>"
3. package="rw.Trans"
4. android:versionCode="1"
5. android:versionName="1.0">
6. <uses-sdk android:minSdkVersion="10" /></p><p> <application android:icon="@drawable/icon" android:label="@string/app_name">
7. <activity android:name=".TransParentActivity"
8. android:label="Transparent SurfaceView"
9. <span style="color:#ff0000;"> android:theme="@android:style/Theme.Translucent"
10. </span> ></p><p>
11. <intent-filter>
12. <action android:name="android.intent.action.MAIN" />
13. <category android:name="android.intent.category.LAUNCHER" />
14. </intent-filter>
15. </activity></p><p> </application>
16. </manifest></p>