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当我按下 home 并返回它时,我的应用程序保持 FCing,logcat 没有给我任何错误:

D/gralloc_goldfish(1842): Emulator without GPU emulation detected.
I/Choreographer(1842): Skipped 60 frames!  The application may be doing too much work on its main thread.
I/dalvikvm(1842): threadid=3: reacting to signal 3
I/dalvikvm(1842): Wrote stack traces to '/data/anr/traces.txt'

这是一个非常具有示范性的应用程序,所以我不关心谁在使用它,所以我会发布整个代码:

public class MainActivity extends Activity {


dartBoard board;
EditText radius;
EditText numDarts;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    board = new dartBoard(this);
    Display mDisplay = this.getWindowManager().getDefaultDisplay();
    int width= mDisplay.getWidth();
    int Height= mDisplay.getHeight();
    LinearLayout lin = new LinearLayout(this);
    LinearLayout linMain = new LinearLayout(this);




    Button throwDart = new Button(this);
    Button setRadius = new Button(this);


    setRadius.setWidth(LinearLayout.LayoutParams.WRAP_CONTENT);
    setRadius.setHeight(LinearLayout.LayoutParams.WRAP_CONTENT);
    setRadius.setText("Set Radius");
    setRadius.setTextSize(10);

    setRadius.setOnClickListener(radiusListener);

    throwDart.setWidth(LinearLayout.LayoutParams.WRAP_CONTENT);
    throwDart.setHeight(LinearLayout.LayoutParams.WRAP_CONTENT);
    throwDart.setText("Throw Dart");
    throwDart.setTextSize(10);
    throwDart.setOnClickListener(throwListener);



    numDarts = new EditText(this);
    radius = new EditText(this);


    radius.setHint("Set Radius");
    radius.setText("3");
    radius.setInputType(InputType.TYPE_CLASS_NUMBER);
    numDarts.setText("5");
    numDarts.setHint("Num Darts?");
    numDarts.setInputType(InputType.TYPE_CLASS_NUMBER);


    android.widget.FrameLayout.LayoutParams params = new android.widget.FrameLayout.LayoutParams(width, width);
    board.setLayoutParams(params);


    lin.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT , LinearLayout.LayoutParams.WRAP_CONTENT));
    lin.setOrientation(LinearLayout.VERTICAL);

    lin.addView(board);
    linMain.addView(numDarts);
    linMain.addView(throwDart);
    linMain.addView(radius);
    linMain.addView(setRadius);

    lin.addView(linMain);

    setContentView(lin);
}
View.OnClickListener throwListener = new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        try{
            board.throwDarts(Integer.parseInt(numDarts.getText().toString()));
        }
        catch (NumberFormatException e){
            Toast.makeText(getApplicationContext(), "Enter A number!", Toast.LENGTH_LONG).show();

        }

    }
};

View.OnClickListener radiusListener = new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        try{
            int num = Integer.parseInt(radius.getText().toString());
            board.changeRadius(num);
        }
        catch(NumberFormatException e){
            Toast.makeText(getApplicationContext(), "Enter a Radius!", Toast.LENGTH_LONG).show();
        }

    }
}; 

@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    board.pause();
}
@Override
protected void onResume() {
    // TODO Auto-generated method stub
    super.onResume();
    board.resume();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}







public static class dartBoard extends SurfaceView implements Runnable{
    Boolean threadRunning, throwingDarts;
    SurfaceHolder holder;
    Thread t = null;
    Paint blue,red,black,white;
    int rad, numberOfDarts;
    Rect r; 
    int x[],y[];





    public dartBoard(Context context) {
    super(context);
    // TODO Auto-generated constructor stub

    threadRunning = false;
    throwingDarts = false; 

    holder = getHolder();
    blue = new Paint();
    blue.setColor(Color.BLUE);
    blue.setStyle(Style.FILL);

    red = new Paint();
    red.setColor(Color.RED);
    red.setStyle(Style.FILL);

    black = new Paint();
    black.setColor(Color.BLACK);
    black.setStyle(Style.STROKE);

    white = new Paint();
    white.setColor(Color.WHITE);
    white.setStyle(Style.FILL);

    rad = 3;

    }

    public void onDraw(Canvas canvas){
        canvas.getWidth();

        r = new Rect(0,0, canvas.getWidth(), canvas.getWidth());
        canvas.drawRect(r, blue);
        canvas.drawCircle(canvas.getWidth()/2, canvas.getHeight()/2, rad*(canvas.getWidth()/20) , red);
        canvas.drawLine(0, canvas.getWidth()/2, canvas.getWidth(), canvas.getWidth()/2, black);
        canvas.drawLine(canvas.getWidth()/2, 0, canvas.getWidth()/2, canvas.getWidth(), black);

        if(throwingDarts){

            for(int i = 0; i < numberOfDarts; i++){
                canvas.drawCircle(x[i]*(canvas.getWidth()/20), y[i]*(canvas.getWidth()/20), (canvas.getWidth()/20), white);
                canvas.drawCircle(x[i]*(canvas.getWidth()/20), y[i]*(canvas.getWidth()/20), (canvas.getWidth()/20), black);

            }


        }

    }
    @SuppressLint("WrongCall")
    @Override
    public void run() {
        // TODO Auto-generated method stub
        while(threadRunning){
            if(!holder.getSurface().isValid()){
                continue;
            }
            Canvas c = holder.lockCanvas();
            onDraw(c);
            holder.unlockCanvasAndPost(c);
        }


    }

    public final void resume(){
        t = new Thread(this);
        t.start();
        threadRunning = true;
    }
    public final void pause(){
        while(true){
            try {
                t.join();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            break;
        }
        t = null;

    }

    public void changeRadius(int r){
        rad = r;
    }
    public void throwDarts(int numDarts)
    {
        numberOfDarts = numDarts;

        Random rand = new Random();

        x = new int[numDarts];
        y = new int[numDarts];
        for(int i = 0; i < numDarts; i++)
        {
            x[i] = rand.nextInt(21);
            y[i] = rand.nextInt(21);
        }
        throwingDarts = true;

    }

    public boolean hit(int x, int y)
    {
        if(Math.sqrt(x*x + y*y) <= 3)
        {
            return true;
        }
        else
        {
            return false;
        }
    }

}
}

这个应用程序没有什么特别的,只是在按下按钮时绘制到画布上。返回应用程序时,除了 FC 外,它工作正常。谁能帮我?我会很感激的:]

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