WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY

然而我的在華為8.0 p10手機上沒有任何反應

最終解決的辦法是 

WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY-1

完整程式碼如下:

TYPE_SYSTEM_ALERT :在有些手機上不行,比如三星,努比亞的,所以使用:TYPE_TOAST

    AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(getApplicationContext(), AlertDialog.THEME_DEVICE_DEFAULT_LIGHT
 
);
dialogBuilder.setTitle("提示");
dialogBuilder.setMessage("xxxxxxxxxxxxx");
dialogBuilder.setCancelable(false);
dialogBuilder.setNegativeButton("退出登入", new DialogInterface.OnClickListener() {
            @Override
public void onClick(DialogInterface dialog, int which) {
}
        });
dialogBuilder.setPositiveButton("
 
重新登入", new DialogInterface.OnClickListener() {
            @Override
public void onClick(DialogInterface dialog, int which) {
}
        });
AlertDialog alertDialog = dialogBuilder.create();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {//8.0新特性
alertDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY 
 
- 1);
} else {
            alertDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_TOAST);
}
        alertDialog.show();