Berechtigungen für eine App die ein Foto macht und anzeigt

public class AalBild extends AppCompatActivity {




    Button btn1;
    ImageView iv1;
    Intent bildintent;
    int RQ = 45;
    int RQ2 =23;
    int RQ3 =22;
    File bildfile;
    Uri bilduri;
    int Kameracode = 15;
    Bitmap bm1;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_aal_bild);


        if (ContextCompat.checkSelfPermission(AalBild.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED){
            if1();
        }else {


            ActivityCompat.requestPermissions(AalBild.this, new  String[] {Manifest.permission.WRITE_EXTERNAL_STORAGE},RQ);
        }


        File dir = new File(Environment.getExternalStorageDirectory(), "FotoApp");
        dir.mkdirs();
        bildfile = new File(dir, "bild.png");
        try {
            bildfile.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }




        bilduri = Uri.fromFile(bildfile);






        StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
        StrictMode.setVmPolicy(builder.build());
        btn1 = (Button) findViewById(R.id.btn2);
        iv1 = (ImageView) findViewById(R.id.imageView4);
        if (bildfile.exists()){
            bm1 = BitmapFactory.decodeFile(bildfile.getAbsolutePath());
            iv1.setImageBitmap(bm1);
        }
        btn1.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {




                foto();


            }
        });




    }
    private void if1(){
        if (ActivityCompat.checkSelfPermission(AalBild.this, Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED){
            if2();
        }else {
            ActivityCompat.requestPermissions(AalBild.this, new String[] {Manifest.permission.READ_EXTERNAL_STORAGE},RQ2);
        }
    }
    protected void if2(){
        if (ActivityCompat.checkSelfPermission(AalBild.this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED){
        }else{
            ActivityCompat.requestPermissions(AalBild.this, new String[] {Manifest.permission.CAMERA},RQ3);
        }
    }
    private void foto(){
        try{
            bildintent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            bildintent.putExtra(MediaStore.EXTRA_OUTPUT, bilduri);
            startActivityForResult(bildintent, Kameracode);
        }catch(Exception e) {
            e.printStackTrace();
            Toast.makeText(getApplicationContext(), "Kamera nicht unterstützt!", Toast.LENGTH_SHORT).show();
        }
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == RESULT_OK){
            if(requestCode == Kameracode){
                Toast.makeText(getApplicationContext(), "Bild gespeichert unter: " + bildfile.getAbsolutePath(), Toast.LENGTH_SHORT).show();
                bm1 = BitmapFactory.decodeFile(bildfile.getAbsolutePath());
                iv1.setImageBitmap(bm1);
            }
        }
        super.onActivityResult(requestCode, resultCode, data);
    }
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == RQ && grantResults.length >0 && grantResults[0] == PackageManager.PERMISSION_GRANTED && requestCode == RQ2 && grantResults.length >0 && grantResults[0] ==PackageManager.PERMISSION_GRANTED && requestCode == RQ3 && grantResults.length >0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){


        }
    }
}