android - mLayout.addView() 只工作一次

Question

我最近开始为 android 开发，但在尝试向布局添加多个 View 时遇到了困难。它实际上适用于第一次触摸，但之后它什么都不做。日志虽然继续工作并显示已检测到触摸并显示事件的位置。我有以下代码

public class MainActivity extends Activity {
private LinearLayout mLayout;
private Context con = this;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mLayout = (LinearLayout) findViewById(R.id.lLayout);
    mLayout.setOnTouchListener(new View.OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            switch (event.getActionMasked()) {
                case MotionEvent.ACTION_DOWN:
                    mLayout.addView(createNewView(event.getX(), event.getY()));
                    Log.d("this ","View has been add." + event.getX()+ ", " + event.getY());
                    break;
            }
            return false;
        }
    });
}

private markerView createNewView(float x, float y) {
    final LayoutParams lparams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    final markerView mView = new markerView(con, 150, x, y);
    mView.setLayoutParams(lparams);
    return mView;
}}

和 公共(public)类 markerView extends View implements View.OnTouchListener{

private Paint paint = new Paint();
private int diameter;
private float X,Y;

public markerView(Context context, int dia, float dx, float dy) {
    super(context);
    diameter = dia;
    X = dx; Y = dy;
    paint.setColor(Color.GREEN);
    paint.setStyle(Style.STROKE);
    paint.setStrokeWidth((float) 4.0);
}

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    canvas.save();
    canvas.drawCircle(X, Y, diameter, paint);
    canvas.restore();
}

@Override
public boolean onTouch(View v, MotionEvent event) {
    return true;
}}

Answer 1

尝试删除 final markerView 上的 final 标签 mView = new markerView(con, 150, x, y);