android中不依赖activity的dialog弹窗的实现

private void showUpdateSuccessDialog(){
final WindowManager wm = (WindowManager) AppContext.context.getSystemService(Context.WINDOW_SERVICE);

WindowManager.LayoutParams para = new WindowManager.LayoutParams();
para.height = -2;//WRAP_CONTENT
para.width = -2;//WRAP_CONTENT
para.format = 1;

para.flags = WindowManager.LayoutParams.FLAG_FULLSCREEN | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;
para.gravity = Gravity.CENTER;

para.type = WindowManager.LayoutParams.TYPE_TOAST;

final View contentView = LayoutInflater.from(getActivity()).inflate(R.layout.dialog_layout, null);
TextView tvDlgTiTle = (TextView) contentView.findViewById(R.id.tv_title_dialog);
TextView tvDlgSubTitle = (TextView) contentView.findViewById(R.id.tv_subtitle_dialog);
TextView tvDlgBtn = (TextView) contentView.findViewById(R.id.tv_dialog_btn);

tvDlgTiTle.setText("更新成功");
tvDlgSubTitle.setText("固件将会重启");
tvDlgBtn.setText("固件重启将会持续几分钟...");

tvDlgBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
wm.removeView(contentView);
}
});
wm.addView(contentView, para);
}

其中的关键就是

para.type = WindowManager.LayoutParams.TYPE_TOAST;

这段代码,即设置一个window级别与toast相同的弹窗.一般网上推荐使用的是

para.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;

但在某些手机系统上即便在manifest中声明了

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>

也不会生效,比如我遇到的魅族pro5就不会生效.

而toast级别的已经足够我们使用了,而且是不再依赖于activity的.