Android implements dragging function ~ organization ~ available for personal testing-javaTutorial-php.cn

Android implements dragging function ~ organization ~ available for personal testing

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Release： 2017-08-02 11:26:48

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To develop Android applications, you need to install eclipse, jdk and sdk first, and then create an Android phone simulator. Not much to say here.

The dragging function of Android appears in many scenarios, so how to implement this function has been modified and debugged by me.

The code is as follows:

First create two instances of imageView1 and imageView2 on the view interface, and then paste the following code into the java class file

private int screenWidth; 
private int screenHeight; 
private ImageView img1; 
private ImageView img2;
img1 = (ImageView) findViewById(R.id.imageView1); 
img2 = (ImageView) findViewById(R.id.imageView2);
DisplayMetrics dm = getResources().getDisplayMetrics(); 
screenWidth = dm.widthPixels; 
screenHeight = dm.heightPixels - 50;
img1.setOnTouchListener(movingEventListener); 
img2.setOnTouchListener(movingEventListener);
private OnTouchListener movingEventListener = new OnTouchListener() { 
int lastX, lastY; 
@Override 
public boolean onTouch(View v, MotionEvent event) { 
    switch (event.getAction()) { 
    case MotionEvent.ACTION_DOWN: 
        lastX = (int) event.getRawX(); 
        lastY = (int) event.getRawY(); 
        break; 
    case MotionEvent.ACTION_MOVE: 
        int dx = (int) event.getRawX() - lastX; 
        int dy = (int) event.getRawY() - lastY;
        int left = v.getLeft() + dx; 
        int top = v.getTop() + dy; 
        int right = v.getRight() + dx; 
        int bottom = v.getBottom() + dy; 
        // ÉèÖÃ²»ÄÜ³ö½ç 
        if (left < 0) { 
            left = 0; 
            right = left + v.getWidth(); 
        }
        if (right > screenWidth) { 
            right = screenWidth; 
            left = right - v.getWidth(); 
        }
        if (top < 0) { 
            top = 0; 
            bottom = top + v.getHeight(); 
        }
        if (bottom > screenHeight) { 
            bottom = screenHeight; 
            top = bottom - v.getHeight(); 
        }
        v.layout(left, top, right, bottom);
        lastX = (int) event.getRawX(); 
        lastY = (int) event.getRawY();
        break; 
    case MotionEvent.ACTION_UP: 
        break; 
    } 
    return true; 
} 
};

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