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是否有可能繪製圖像時,觸摸並有一個透明的BG,所以我看到我的homesceen本:Android開發:2D圖形透明?
android:theme="@android:style/Theme.Translucent.NoTitleBar"
這裏是我的項目迄今:
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Bitmap.Config;
import android.os.Bundle;
import android.view.Display;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;
import android.view.WindowManager;
import android.os.Bundle;
public class main extends Activity {
private Panel mG;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
// setContentView(new Panel(this));
setContentView(R.layout.main);
mG = new Panel(this);
setContentView(mG);
}
class Panel extends SurfaceView implements SurfaceHolder.Callback {
private TutorialThread _thread;
private ArrayList<GraphicObject> _graphics = new ArrayList<GraphicObject>();
public Panel(Context context) {
super(context);
getHolder().addCallback(this);
_thread = new TutorialThread(getHolder(), this);
setFocusable(true);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
synchronized (_thread.getSurfaceHolder()) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
GraphicObject graphic = new GraphicObject(BitmapFactory.decodeResource(getResources(), R.drawable.myicon));
graphic.getCoordinates().setX((int) event.getX() - graphic.getGraphic().getWidth()/2);
graphic.getCoordinates().setY((int) event.getY() - graphic.getGraphic().getHeight()/2);
_graphics.add(graphic);
}
return true;
}
}
@Override
public void onDraw(Canvas canvas) {
Display display = ((WindowManager)getSystemService(WINDOW_SERVICE)).getDefaultDisplay();
int height = display.getHeight(); // not exactly correct
int width = display.getWidth(); // not exactly correct
//Bitmap bitmap = Bitmap.createBitmap(width, height, Config.ALPHA_8);//Config.RGB_565);
//canvas.drawColor(Color.Transparent);
Bitmap bitmap;
GraphicObject.Coordinates coords;
for (GraphicObject graphic : _graphics) {
bitmap = graphic.getGraphic();
coords = graphic.getCoordinates();
canvas.drawBitmap(bitmap, coords.getX(), coords.getY(), null);
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
// TODO Auto-generated method stub
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
_thread.setRunning(true);
_thread.start();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// simply copied from sample application LunarLander:
// we have to tell thread to shut down & wait for it to finish, or else
// it might touch the Surface after we return and explode
boolean retry = true;
_thread.setRunning(false);
while (retry) {
try {
_thread.join();
retry = false;
} catch (InterruptedException e) {
// we will try it again and again...
}
}
}
}
class TutorialThread extends Thread {
private SurfaceHolder _surfaceHolder;
private Panel _panel;
private boolean _run = false;
public TutorialThread(SurfaceHolder surfaceHolder, Panel panel) {
_surfaceHolder = surfaceHolder;
_panel = panel;
}
public void setRunning(boolean run) {
_run = run;
}
public SurfaceHolder getSurfaceHolder() {
return _surfaceHolder;
}
@Override
public void run() {
Canvas c;
while (_run) {
c = null;
try {
c = _surfaceHolder.lockCanvas(null);
synchronized (_surfaceHolder) {
_panel.onDraw(c);
}
} finally {
// do this in a finally so that if an exception is thrown
// during the above, we don't leave the Surface in an
// inconsistent state
if (c != null) {
_surfaceHolder.unlockCanvasAndPost(c);
}
}
}
}
}
class GraphicObject {
/**
* Contains the coordinates of the graphic.
*/
public class Coordinates {
private int _x = 100;
private int _y = 0;
public int getX() {
return _x + _bitmap.getWidth()/2;
}
public void setX(int value) {
_x = value - _bitmap.getWidth()/2;
}
public int getY() {
return _y + _bitmap.getHeight()/2;
}
public void setY(int value) {
_y = value - _bitmap.getHeight()/2;
}
public String toString() {
return "Coordinates: (" + _x + "/" + _y + ")";
}
}
private Bitmap _bitmap;
private Coordinates _coordinates;
public GraphicObject(Bitmap bitmap) {
_bitmap = bitmap;
_coordinates = new Coordinates();
}
public Bitmap getGraphic() {
return _bitmap;
}
public Coordinates getCoordinates() {
return _coordinates;
}
}
}
但是背景是黑色,我不認爲我的主屏幕(或我的背景活動)
我做錯了什麼?
//你的朋友!
哪個教程是你的? 而且我試過,但我只能在setContentView中寫一個東西。所以,如果我把main.xml它的作品,但沒有畫布或位圖。或者我選擇新的面板,它不會是透明的:(它必須工作,我已經看到應用程序,如假屏幕破解。 – user564612 2011-01-05 21:39:29
您的代碼是基於我的博客教程... http://www.droidnova.com .. 。你需要在main.xml文件中指定Panel,然後你可以在上面提到的鏈接中添加一些屬性。 – WarrenFaith 2011-01-05 21:42:56
Yeye Droidnova is niccee:P你能否解釋一下如何在main.xml中指定面板?你! – user564612 2011-01-05 21:47:06