简单WindowManager应用

MyApplication.java

package com.example.windowmanagerdemo;import android.app.Application;import android.view.WindowManager;import android.view.WindowManager.LayoutParams;public class MyApplication extends Application{    private static WindowManager.LayoutParams params=new LayoutParams();    public WindowManager.LayoutParams getMywmParams(){        return params;    }}

注意，application需要在注册文件里面注册

MainActivity.java

package com.example.windowmanagerdemo;import android.app.Activity;import android.content.Context;import android.graphics.Color;import android.os.Bundle;import android.view.Gravity;import android.view.Menu;import android.view.MenuItem;import android.view.WindowManager;import android.view.WindowManager.LayoutParams;public class MainActivity extends Activity {    WindowManager mWindowManager;    WindowManager.LayoutParams params;    FloatView mLayout;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        showView();    }    /**     * 构造并显示该悬浮窗，这里不是通过service构造的,所以仅仅在本Activity有效     * 构造内容包括权限标志flags，type，其实位置xy， 宽高，通过给view设置WindowManager.LayoutParams实现     * 通过WindowManager显示     * 所设置的View本身有点击事件     */    private void showView(){        mLayout=new FloatView(getApplicationContext());        mLayout.setBackgroundColor(Color.GRAY);        mWindowManager=(WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE);        //初始化params        params=((MyApplication)getApplicationContext()).getMywmParams();        params.type=WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;//These windows are always on top of application windows.        params.format=1;        params.flags=LayoutParams.FLAG_NOT_FOCUSABLE;//不能抢占焦点        params.flags=params.flags|LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH;        params.flags=params.flags|LayoutParams.FLAG_LAYOUT_NO_LIMITS;//不受排版限制        params.alpha=1.0f;        params.gravity=Gravity.LEFT|Gravity.TOP;        params.x=0;        params.y=0;        params.width=140;        params.height=140;        mWindowManager.addView(mLayout, params);        //mWindowManager.updateViewLayout(mLayout, params);    }    @Override    protected void onDestroy() {        //mWindowManager.removeView(mLayout);    }}

FloatView.java

package com.example.windowmanagerdemo;import android.app.Application;import android.content.Context;import android.view.MotionEvent;import android.view.View;import android.view.WindowManager;public class FloatView extends View {    private float mTouchStartX;    private float mTouchStartY;    private float x;    private float y;    private WindowManager wm = (WindowManager) getContext()            .getApplicationContext().getSystemService(Context.WINDOW_SERVICE);    private WindowManager.LayoutParams wmParams = ((MyApplication) getContext()            .getApplicationContext()).getMywmParams();    public FloatView(Context context) {        super(context);        // TODO Auto-generated constructor stub    }    @Override    public boolean onTouchEvent(MotionEvent event) {        // 获取相对屏幕的坐标，即以屏幕左上角为原点        x = event.getRawX();        y = event.getRawY() - 60;// (不同手机所减的数值可能不一样)        switch (event.getAction()) {        case MotionEvent.ACTION_DOWN:            // 获取view的相对坐标，以此view的左上角为原点            mTouchStartX = event.getX();            mTouchStartY = event.getY();            break;        case MotionEvent.ACTION_MOVE:            updateViewPosition();            break;        case MotionEvent.ACTION_UP:            updateViewPosition();            mTouchStartX = mTouchStartY = 0;            break;        default:            break;        }        return true;    }    // 从这里倒着看，wmParams.x或wmParams.y是新位置的起始坐标，如果对着该图片点并不希望它会移动，但点击点的坐标和该图片所在的左上角的坐标明显不一样    // 这就需要去掉点击点相对该图片左上角的距离，也就是event.getX()或者event.getY()所得到的距离    // 由于y的由来是整个屏幕的左上角，而设置的需要是该Activity的左上角，所以y会偏大 ，偏大的距离是状态栏竖直方向的距离，本手机大概就是60    private void updateViewPosition() {        // 更新浮动窗口位置参数        wmParams.x = (int) (x - mTouchStartX);        wmParams.y = (int) (y - mTouchStartY);        wm.updateViewLayout(this, wmParams);    }}