Android中6.0及以上悬浮窗申请权限

try{

//判断当前系统版本
if(Build.VERSION.SDK_INT>=23) {

//判断权限是否已经申请过了（加上这个判断，则使用的悬浮窗的时候；如果权限已经申请则不再跳转到权限开启界面）
if (!Settings.canDrawOverlays(this)){

//申请权限
Intent  intent2=new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);
startActivityForResult(intent2, 1);
}else{

//创建悬浮窗
Intent intent3 = new Intent(MainActivity.this, MenuService.class);
startService(intent3);
}
}else{
Intent intent3 = new Intent(MainActivity.this, MenuService.class);
startService(intent3);
}
System.out.println("Build.VERSION.SDK_INT::::"+Build.VERSION.SDK_INT);
}catch (Exception e){
e.printStackTrace();
}

2.回调结果

@RequiresApi(api = Build.VERSION_CODES.M)
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 1) {
if(Build.VERSION.SDK_INT>=23) {
if (!Settings.canDrawOverlays(this)) {
Toast.makeText(MainActivity.this, "权限授予失败，无法开启悬浮窗", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(MainActivity.this, "权限授予成功！", Toast.LENGTH_SHORT).show();
//创建悬浮窗
Intent intent = new Intent(MainActivity.this, MenuService.class);
startService(intent);
}
}
}
}