Windowmanager使用

一、WindowManger可以用于应用外弹屏或悬浮窗360手机卫士的弹窗印象深刻 首先需要系统权限

<!-- 悬浮窗的显示 --> <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

二、在维护一个刚接手的项目时，发现有的手机像SUMSUNG,LENOVO，按home键 悬浮窗就会随应用消失， 为了解决这个问题就各种方式开始了， 1、MainActivity.java 启动按钮布置

/** * 从Service启动 */ findViewById(R.id.bt_servcie).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent wIntent = new Intent(MainActivity.this, WindowService.class); startService(wIntent); } }); /** * 从Activity启动 */ findViewById(R.id.bt_activity).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { WindowMnagerUtil.getWindowInstance(MainActivity.this).createWindow(); //会消失 // WindowMnagerUtil.getWindowInstance(getApplicationContext()).createWindow(); //不会消失 } }); /** * 不使用单例模式启动 */ findViewById(R.id.bt_noapplication).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { WindowMnagerNoinstanceUtil.createWindow(MainActivity.this); //会消失 // WindowMnagerNoinstanceUtil.createWindow(getApplicationContext()); 不会消失 } });

2、第一种方式是先启动WindowService,然后在Service通过WindowManager管 理，我觉得这样做的话和Service特性有关

public class WindowService extends Service { public WindowService() { } @Override public IBinder onBind(Intent intent) { // TODO: Return the communication channel to the service. throw new UnsupportedOperationException("Not yet implemented"); } @Override public int onStartCommand(Intent intent, int flags, int startId) { // WindowMnagerUtil.getWindowInstance(getApplicationContext()).createWindow(); //这个是在Service中用单例模式工具类 WindowMnagerNoinstanceUtil.createWindow(this); //在Service中正常启动 return super.onStartCommand(intent, flags, startId); } }

没想到这种方式是可行的

一开始，Service中是用使用了单例模式工具类，然后我就想， 我在Activity中启动试试，没想到也是可以的,其实主要的原因和是否单利是没有关系的 从实验例子中看到关系是传进去的Context的对象是 actiivty还是Application

至此在这两种特殊的手机机型的解决方法也就明朗了 一种是Service启动WindowMnager 另一种是传application对象

3、WindowManager管理方法

/** * 创建悬浮窗，添加一张美女图 */ public void createWindow() { final WindowManager windowMnager = getWindowMnager(context); //得到WindowManager对象 wmParams = new WindowManager.LayoutParams(); wmParams.type = WindowManager.LayoutParams.TYPE_TOAST; wmParams.width = WindowManager.LayoutParams.WRAP_CONTENT; wmParams.height = WindowManager.LayoutParams.WRAP_CONTENT; //只有打电话才会显示在屏幕上方 wmParams.gravity = Gravity.CENTER; wmParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE; imageView = new ImageView(context); //设置添加的图片 imageView.setImageResource(R.mipmap.girl); imageView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { removeWindow(); } }); windowMnager.addView(imageView, wmParams); }

4、用代码写布局、最外层用FrameLayout FrameLayout is designed to block out an area on the screen to display a single item. Generally, FrameLayout should be used to hold a single child view, because it can be difficult to organize child views in a way that’s scalable to different screen sizes without the children overlapping each other. You can, however, add multiple children to a FrameLayout and control their position within the FrameLayout by assigning gravity to each child, using the android:layout_gravity attribute.

//设置最外层FrameLayout布局 final FrameLayout fl = new FrameLayout(context); FrameLayout.LayoutParams flParams = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT); fl.setLayoutParams(flParams); fl.setBackgroundColor(Color.BLACK); //设置 RelativeLayout布局 RelativeLayout rl = new RelativeLayout(context); FrameLayout.LayoutParams rlp = new FrameLayout.LayoutParams(500, 500); rlp.gravity = Gravity.CENTER; //这两行设置剧中显示 ， 使用FrameLayout 属性中 android:layout_gravity 设置居中 rl.setBackgroundColor(Color.BLUE); rl.setLayoutParams(rlp); //设置图片 ImageView imageView = new ImageView(context); //设置添加的图片 RelativeLayout.LayoutParams ivParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); rl.addView(imageView, ivParams); imageView.setImageResource(R.mipmap.girl); fl.addView(rl, rlp);

Reference : http://blog.csdn.net/guolin_blog/article/details/8689140

代码