@OnClick(R.id.to_camear_btn)
    public void onClick() {

//        checkSelfPermission 檢測有沒有 許可權
//        PackageManager.PERMISSION_GRANTED 有許可權
//        PackageManager.PERMISSION_DENIED  拒絕許可權
if(ActivityCompat.checkSelfPermission(this,Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED
 
){
            //許可權發生了改變 true  //  false 小米
if(ActivityCompat.shouldShowRequestPermissionRationale(this,Manifest.permission.CAMERA)){



                new AlertDialog.Builder(this).setTitle("title")
                        .setPositiveButton("ok", new DialogInterface.OnClickListener() {
                            @Override
 
public void onClick(DialogInterface dialog, int which) {
                                // 請求授權
ActivityCompat.requestPermissions(PermissionActivity.this,new String[]{Manifest.permission.CAMERA},1);
}
                        }).setNegativeButton("cancel", new DialogInterface.OnClickListener() {
                    @Override
 
public void onClick(DialogInterface dialog, int which) {

                    }
                }).create().show();
}else {
                ActivityCompat.requestPermissions(PermissionActivity.this,new String[]{Manifest.permission.CAMERA},1);
}

        }else{

            camear();
}




    }


    /**
     *
     * @param requestCode
* @param permissions 請求的許可權
     * @param grantResults 請求許可權返回的結果
     */
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if(requestCode == 1){
            // camear 許可權回撥
if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){

                // 表示使用者授權
Toast.makeText(this, " user Permission" , Toast.LENGTH_SHORT).show();
camear();
} else {

                //使用者拒絕許可權
Toast.makeText(this, " no Permission" , Toast.LENGTH_SHORT).show();
}



        }

    }

    public void camear(){
        try {
            Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent,1);
} catch (Exception e) {
            e.printStackTrace();
}
    }