Android scan and generate QR codes

public class MainActivity extends AppCompatActivity {

 private ImageView mImageView;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  (savedInstanceState);
  setContentView(.activity_main);

  Button button =findViewById();
  mImageView =findViewById();
  (new () { //Click the button to scan the QR code   @Override
   public void onClick(View view) {
    Intent intent = new Intent(,);


    startActivityForResult(intent,2);
   }
  });

 }

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  (requestCode, resultCode, data);
  if (requestCode==200&& resultCode==RESULT_OK){

   if (data!=null){
    String content = (Constant.CODED_CONTENT);
    if ((content)){

     (, "Your input is empty!", Toast.LENGTH_SHORT).show();
     return;

    }

    Bitmap logo = (getResources(), .ic_launcher);
    try {
     Bitmap bitmap = (content, 400, 400, logo);
     (bitmap);
    } catch (WriterException e) {
     ();
    }

    (,"scanning"+content,Toast.LENGTH_SHORT).show();


   }
  }
 }
}

< xmlns:andro
 xmlns:app="/apk/res-auto"
 xmlns:tools="/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context=".MainActivity"
 android:orientation="vertical">

 <Button
  android:
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="Scan"/>

 <ImageView
  android:
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  />

</>

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

minSdkVersion 16  //Configuration 16implementation'.yuzhiqiang1993:zxing:2.2.1' //rely

allprojects {
 repositories {
  google()
  jcenter()
  maven { url '' } //Add this line of code }
}