public class MainActivity extends AppCompatActivity {

    @Override
protected void onCreate(Bundle savedInstanceState) {
        super
 
.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        this.findViewById(R.id.tv_callPhone).setOnClickListener(new View.OnClickListener() {
            @SuppressLint("MissingPermission")
            @Override
public void onClick(View v) {
                call();
            }


        });
    }

    /**
 
     * 檢查許可權
     */
private void call() {
        /**
         * 檢查App是否有permission.CALL_PHONE許可權，就申請許可權
         */
if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
          
            /**
             * 沒有permission.CALL_PHONE許可權，就申請許可權
 
             */
ActivityCompat.requestPermissions(MainActivity.this,
                    new String[]{Manifest.permission.CALL_PHONE}, 66);
        } else {
            callPhone();
        }

    }


    /**
     * 撥打電話
     */
@SuppressLint("MissingPermission")
    private void callPhone() {
        Intent intent = new Intent(Intent.ACTION_CALL);
        Uri uri = Uri.parse("tel:" + 10085);
        intent.setData(uri);
        startActivity(intent);
    }


    /**
     * 申請許可權的回撥結果
     *
     * @param requestCode  請求碼
     * @param permissions  請求許可權
     * @param grantResults 授權結果
     */
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        if (requestCode == 66) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                callPhone();
            } else {
                Toast.makeText(this,"許可權被拒絕",Toast.LENGTH_LONG).show();
            }
        }
    }
}

 if (requestCode == 66) {
        if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            callPhone();
        } else {
            if (!ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.CALL_PHONE)) {

                AlertDialog alertDialog = new AlertDialog.Builder(this)
                        .setMessage("提示")
                        .setPositiveButton("確定", new DialogInterface.OnClickListener() {
                            @Override
public void onClick(DialogInterface dialog, int which) {
                                
                            }
                        })
                        .create();

                alertDialog.show();
            }
            Toast.makeText(this, "許可權被拒絕", Toast.LENGTH_LONG).show();
        }
    }
}