安卓实现拖动功能~整理~亲测可用

开发安卓应用，你需要先安装 eclipse 和 jdk 和 sdk ,然后创建安卓手机模拟器。这里就不多说了。

安卓的拖动功能在很多场景中都会出现，那么如何实现这一功能,经本人修改调试通过。

代码如下：

先在试图界面上创建imageView1与imageView2两个实例，再将下面代码贴入java类文件中

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;         // éè??2??ü3???         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; } };

是不是已经成功了，欢迎来学习编程

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