android广播中实现弹出窗口

配置的权限：
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
public class MainActivity extends AppCompatActivity {Handler mHandle;    Button mButton;    private BroadcastReceiver mRecemiver=new BroadcastReceiver() {        @Override        public void onReceive(Context context, Intent intent) {            //检测API是不是小于23，因为到了API23之后getNetworkInfo(int networkType)方法被弃用            if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.LOLLIPOP) {                //获得ConnectivityManager对象                ConnectivityManager connMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);                //获取ConnectivityManager对象对应的NetworkInfo对象                //获取WIFI连接的信息                NetworkInfo wifiNetworkInfo = connMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);                //获取移动数据连接的信息                NetworkInfo dataNetworkInfo = connMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);                if (wifiNetworkInfo.isConnected() && dataNetworkInfo.isConnected()) {                    Toast.makeText(context, "WIFI已连接,移动数据已连接", Toast.LENGTH_SHORT).show();                } else if (wifiNetworkInfo.isConnected() && !dataNetworkInfo.isConnected()) {                    Toast.makeText(context, "WIFI已连接,移动数据已断开", Toast.LENGTH_SHORT).show();                } else if (!wifiNetworkInfo.isConnected() && dataNetworkInfo.isConnected()) {                    Toast.makeText(context, "WIFI已断开,移动数据已连接", Toast.LENGTH_SHORT).show();                } else {                    Toast.makeText(context, "WIFI已断开,移动数据已断开", Toast.LENGTH_SHORT).show();                }//API大于23时使用下面的方式进行网络监听            }else {                System.out.println("API level 大于23");                //获得ConnectivityManager对象                ConnectivityManager connMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);                //获取所有网络连接的信息                Network[] networks = connMgr.getAllNetworks();                //用于存放网络连接信息                StringBuilder sb = new StringBuilder();                //通过循环将网络信息逐个取出来                for (int i=0; i < networks.length; i++){                    //获取ConnectivityManager对象对应的NetworkInfo对象                    NetworkInfo networkInfo = connMgr.getNetworkInfo(networks[i]);                    sb.append(networkInfo.getTypeName() + " connect is " + networkInfo.isConnected());                }                Toast.makeText(context, sb.toString(),Toast.LENGTH_SHORT).show();            }        }    };    @RequiresApi(api = Build.VERSION_CODES.M)    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mButton= (Button) findViewById(R.id.button);        mButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //startService(new Intent(MainActivity.this,MyService.class));                mHandle.sendEmptyMessageDelayed(100,6000);            }        });        mHandle = new Handler() {            @Override            public void handleMessage(Message msg) {                Intent intent=new Intent();                intent.setAction("test");                sendBroadcast(intent);                super.handleMessage(msg);            }        };        checkDrawOverlayPermission();//        mHandle.postDelayed(new Thread() {//            @Override//            public void run() {//                Log.e("wxf", "111");//                AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this);////                dialog.setTitle("测试");//                dialog.setIcon(android.R.drawable.ic_dialog_info);//                dialog.setMessage("测试 ");//                AlertDialog mDialog = dialog.create();//                mDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);//                mDialog.show();//                super.run();//            }//        }, 3000);    }    @RequiresApi(api = Build.VERSION_CODES.M)    public void checkDrawOverlayPermission() {        //  Settings.canDrawOverlays()        if (!Settings.canDrawOverlays(MainActivity.this)) {            Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,                    Uri.parse("package:" + getPackageName()));            startActivityForResult(intent, 111);        }    }    @RequiresApi(api = Build.VERSION_CODES.M)    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        if (requestCode == 111) {            if (Settings.canDrawOverlays(this)) {            }        }    }}

public class reciber extends BroadcastReceiver{    @Override    public void onReceive(final Context context, Intent intent) {        AlertDialog.Builder builder = new AlertDialog.Builder(context);               builder.setTitle("提示");        builder.setMessage("确定打开主界面吗？");                builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {                      @Override                   public void onClick(DialogInterface dialog, int which) {                           Intent intent1 = new Intent(context, MainActivity.class);                      //在广播接收器中启动活动，一定要给Intent加入FLAG_ACTIVITY_NEW_TASK标志                      intent1.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);                      context.startActivity(intent1);                  }           });       AlertDialog dialog = builder.create();         //需要把对话框的类型设为TYPE_SYSTEM_ALERT，否则对话框无法在广播接收器里弹出           dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);         dialog.show();//////        AlertDialog.Builder dialog = new AlertDialog.Builder(context);////        dialog.setTitle("测试");//        dialog.setIcon(android.R.drawable.ic_dialog_info);//        dialog.setMessage("测试 ");//        AlertDialog mDialog = dialog.create();//        mDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);//        mDialog.show();    }}