private static final String TAG = "DragViewActivity";
private ImageView iv_dv_view;
private TextView tv_drag_view;
private int startx;
private int starty;
private SharedPreferences sp;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.dragview);
//   Drawable drawable = new ColorDrawable(color.transparent);
//   getWindow().setBackgroundDrawable(drawable);
    iv_dv_view = (ImageView) this.findViewById(R.id.iv_dv_view);
    tv_drag_view = (TextView) this.findViewById(R.id.tv_drag_view);
    sp = this.getSharedPreferences("config", Context.MODE_PRIVATE);
    iv_dv_view.setOnTouchListener(this);
  }
  @Override
  protected void onResume() {
    super.onResume();
    int x = sp.getInt("lastx", 0);
    int y = sp.getInt("lasty", 0);
//   iv_dv_view.layout(iv_dv_view.getLeft() + x, iv_dv_view.getTop() + y,
//       iv_dv_view.getRight() + x, iv_dv_view.getBottom() + y);
//   iv_dv_view.invalidate();//界面重新渲染
    LayoutParams params = (LayoutParams) iv_dv_view.getLayoutParams();
    params.leftMargin = x;
    params.topMargin = y;
    iv_dv_view.setLayoutParams(params);
  }
  @Override
  public boolean onTouch(View v, MotionEvent event) {
    switch (v.getId()) {
    // 如果手指放在imageView上拖動
    case R.id.iv_dv_view:
      // event.getRawX(); //獲取手指第一次接觸屏幕在x方向的坐標
      switch (event.getAction()) {
      case MotionEvent.ACTION_DOWN:// 獲取手指第一次接觸屏幕
        startx = (int) event.getRawX();
        starty = (int) event.getRawY();
        break;
      case MotionEvent.ACTION_MOVE:// 手指在屏幕上移動對應的事件
        int x = (int) event.getRawX();
        int y = (int) event.getRawY();
        if (y < 400) {
          // 設置TextView在窗體的下面
          tv_drag_view.layout(tv_drag_view.getLeft(), 420,
              tv_drag_view.getRight(), 440);
        } else {
          tv_drag_view.layout(tv_drag_view.getLeft(), 60,
              tv_drag_view.getRight(), 80);
        }
        // 獲取手指移動的距離
        int dx = x - startx;
        int dy = y - starty;
        // 得到imageView最開始的各頂點的坐標
        int l = iv_dv_view.getLeft();
        int r = iv_dv_view.getRight();
        int t = iv_dv_view.getTop();
        int b = iv_dv_view.getBottom();
        // 更改imageView在窗體的位置
        iv_dv_view.layout(l + dx, t + dy, r + dx, b + dy);
        // 獲取移動后的位置
        startx = (int) event.getRawX();
        starty = (int) event.getRawY();
        break;
      case MotionEvent.ACTION_UP:// 手指離開屏幕對應事件
        Log.i(TAG, "手指離開屏幕");
        // 記錄最后圖片在窗體的位置
        int lasty = iv_dv_view.getTop();
        int lastx = iv_dv_view.getLeft();
        Editor editor = sp.edit();
        editor.putInt("lasty", lasty);
        editor.putInt("lastx", lastx);
        editor.commit();
        break;
      }
      break;
    }
    return true;// 不會中斷觸摸事件的返回
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="#cc000000"
 >
<ImageView
   android:layout_width="160dip"
   android:layout_height="60dip"
   android:background="@drawable/button_background_selected"
   android:id="@+id/iv_dv_view"
  />
 <TextView
   android:id="@+id/tv_drag_view"
   android:layout_marginTop="80dip"
   android:layout_width="fill_parent"
   android:layout_height="20dip"
   android:text="按住綠色條拖動歸屬地顯示的位置"
   />
</RelativeLayout>