Question

我在android工作，我正在使用一个按钮。现在我想执行此按钮的拖放。

这是我的main.xml

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/ll_first"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
>

 <Button  
   android:id="@+id/btn"
   android:layout_width="wrap_content" 
   android:layout_height="wrap_content" 
    android:text="drag me"
  />
 </LinearLayout>

这是我在鼠标拖动时移动此按钮的代码： -

public class DragdropActivity extends Activity implements OnTouchListener {

private final static int START_DRAGGING = 0;
private final static int STOP_DRAGGING = 1;

private Button btn;

private int status;

private ImageView image;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    btn = (Button) findViewById(R.id.btn);
    btn.setDrawingCacheEnabled(true);
    btn.setOnTouchListener(this);

}

@Override
public boolean onTouch(View view, MotionEvent me) {
    if (me.getAction() == MotionEvent.ACTION_DOWN) {
        status = START_DRAGGING;


    }
    if (me.getAction() == MotionEvent.ACTION_UP) {
        status = STOP_DRAGGING;
        Log.i("Drag", "Stopped Dragging");
    } else if (me.getAction() == MotionEvent.ACTION_MOVE) {
        if (status == START_DRAGGING) {
            System.out.println("Dragging");
            Log.v("***Drag and drop **",
                    "me.getRawX and Y = " + me.getRawX() + " "
                            + me.getRawY());
            Log.v("***Drag and drop **",
                    "image position = " + image.getLeft() + " "
                            + image.getRight());
     btn.setPadding((int) me.getRawX(), (int) me.getRawY(), 0,0); //this is not working fine. 


            btn.invalidate();
        }
    }
    return false;
}

}

我认为btn.setPadding()工作不正常，请建议我应该怎么做，以便按钮可以轻松移动到鼠标或手势触摸的位置？

Answer 1

我这样解决了我的问题。

    @Override
     public boolean onTouch(View view, MotionEvent me) {
    if (me.getAction() == MotionEvent.ACTION_DOWN) {
        status = START_DRAGGING;


    }
    if (me.getAction() == MotionEvent.ACTION_UP) {
        status = STOP_DRAGGING;
        Log.i("Drag", "Stopped Dragging");
    } else if (me.getAction() == MotionEvent.ACTION_MOVE) {
        if (status == START_DRAGGING) {
            System.out.println("Dragging");

            LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                    50, 50);
            layoutParams.setMargins((int) me.getRawX() - 25,
                    (int) me.getRawY() - 50, 0, 0);
            layout.removeView(btn);
            layout.addView(btn, layoutParams);

            btn.invalidate();
        }
    }
    return false;
}

现在工作正常。

Answer 2

你应该得到按钮的布局参数，设置左，右，上，下并将这些布局参数设置回按钮

Answer 3

尝试从onTouch()方法返回true。这可能会成功。在我的一个应用程序中它起作用返回false不是按照我的触摸移动移动视图但是返回true语句解决了它。

Android拖放按钮

3 个答案: