实现拖拽ImageView

 

//实现 OnClickListener接口。。。
public class SettingCenterActivity extends Activity implements OnClickListener {
    private RelativeLayout rl_enter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        rl_enter = (RelativeLayout) findViewById(R.id.rl_enter);
        rl_enter.setOnClickListener(this);
    }

    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.rl_enter:
            Intent intent = new Intent(this, DragViewActivity.class);
            startActivity(intent);
            overridePendingTransition(R.anim.trans_in, R.anim.trans_out);
            break;
        }
    }
}

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

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="设置中心"
         android:gravity="center_horizontal"
        android:textColor="#66ff00"
        android:textSize="28sp" />

    <RelativeLayout
        android:id="@+id/rl_enter"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >


        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            >
            <TextView
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:text="归属地提示框位置"
                android:textColor="#66ff00"
                android:textSize="25sp"/>
              <TextView
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:text="提示归属地提示框位置"
                 android:textColor="#99ffffff"
                android:textSize="18sp" />
        </LinearLayout>
           <ImageView
            android:scaleType="center"
            android:paddingLeft="5dip"
            android:paddingTop="8dip"
            android:layout_width="40dip"
            android:layout_height="40dip"
            android:layout_alignParentRight="true"
            android:src="@drawable/director_icon" />

    </RelativeLayout>
     <View
        android:layout_width="fill_parent"
        android:layout_height="1dip"
        android:layout_marginTop="5dip"
        android:background="@drawable/list_devide"
        android:paddingTop="5dip" >
    </View>

</LinearLayout>

public class DragViewActivity extends Activity {
    protected static final String TAG = "DragViewActivity";
    private TextView tv;
    private ImageView iv;
    private SharedPreferences sp;
    private int windowHeight;
    private int windowWidth;
    private long clicktime;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        setContentView(R.layout.main2);
        super.onCreate(savedInstanceState);
        tv = (TextView) findViewById(R.id.tv_drag_view);
        iv = (ImageView) findViewById(R.id.iv_drag_view);

        sp = getSharedPreferences("config", MODE_PRIVATE);
        windowHeight = getWindow().getWindowManager().getDefaultDisplay()
                .getHeight();
        windowWidth = getWindowManager().getDefaultDisplay().getWidth();
        // 初始化 上次记录的imagview在窗体中的位置.
        int endleft = sp.getInt("endleft", 0);
        int endtop = sp.getInt("endtop", 0);

        // 更改imageview初始化的时候 在窗体中的位置
        RelativeLayout.LayoutParams params = (LayoutParams) iv
                .getLayoutParams();
        params.leftMargin = endleft;
        params.topMargin = endtop;
        iv.setLayoutParams(params);

        iv.setOnTouchListener(new OnTouchListener() {
            int startx;
            int starty;

            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN: // 手指第一次触摸到屏幕对应的事件
                    Log.i(TAG, "手指触摸");
                    startx = (int) event.getRawX();
                    starty = (int) event.getRawY();
                    break;

                case MotionEvent.ACTION_MOVE: // 手指在屏幕上移动的时候对应的事件
                    Log.i(TAG, "手指移动");
                    int x = (int) event.getRawX();
                    int y = (int) event.getRawY();
                    int dx = x - startx;
                    int dy = y - starty;
                    Log.i(TAG, "更改imageview在窗体中的位置");
                    int l = iv.getLeft();
                    int r = iv.getRight();
                    int t = iv.getTop();
                    int b = iv.getBottom();
                    int tvbottom = tv.getBottom();
                    int tvtop = tv.getTop();
                    int tvheight = tvbottom - tvtop;
                    if (t > (windowHeight / 2)) {// imageview 在窗体的下面
                        tv.layout(tv.getLeft(), 10, tv.getRight(),
                                10 + tvheight); // 设置tv在窗体的上面
                    } else {
                        // 设置tv在窗体的下面
                        tv.layout(tv.getLeft(), windowHeight - 25 - tvheight,
                                tv.getRight(), windowHeight - 25);
                    }

                    l += dx;
                    r += dx;
                    t += dy;
                    b += dy;

                    if (l < 0 || t < 0 || r > windowWidth || b > windowHeight) {
                        break;
                    }

                    iv.layout(l, t, r, b);
                    // 重新设置初始化图片移动后的位置.
                    startx = (int) event.getRawX();
                    starty = (int) event.getRawY();
                    break;

                case MotionEvent.ACTION_UP: // 手指离开屏幕一瞬间对应的事件
                    Log.i(TAG, "手指离开");
                    int endleft = iv.getLeft();
                    int endtop = iv.getTop();
                    Editor editor = sp.edit();
                    editor.putInt("endleft", endleft);
                    editor.putInt("endtop", endtop);
                    editor.commit();
                    break;
                }
                return false;// True if the listener has consumed the event,
                                // false otherwise.
                // true会消费掉触摸事件 flase话不会消费掉触摸事件.
            }
        });

        iv.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                Log.i(TAG, "我被点击了");
                if (clicktime > 0) {
                    // 第二次的点击
                    long secondtime = System.currentTimeMillis();
                    if (secondtime - clicktime < 500) {
                        Log.i(TAG, "双击");
                        int left = iv.getLeft();
                        int right = iv.getRight();
                        int width = right - left;
                        iv.layout(windowWidth / 2 - width / 2, iv.getTop(),
                                windowWidth / 2 + width / 2, iv.getBottom());
                        int endleft = iv.getLeft();
                        int endtop = iv.getTop();
                        Editor editor = sp.edit();
                        editor.putInt("endleft", endleft);
                        editor.putInt("endtop", endtop);
                        editor.commit();
                    }
                    clicktime = 0; // 两次点击后 数据清零
                    return;
                }

                clicktime = System.currentTimeMillis();
                new Thread() {
                    public void run() {
                        try {
                            Thread.sleep(500);
                            clicktime = 0;
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    };
                }.start();

            }
        });
    }
}

<?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" >

    <ImageView
        android:id="@+id/iv_drag_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/location" />

    <TextView
        android:id="@+id/tv_drag_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="60dip"
        android:text="拖动更改位置\n返回立刻生效"
        android:textSize="25sp" >
    </TextView>

</RelativeLayout>