Processing Bar waehrend App voll ausgelastet ist

package com.example.matrix.threads1;


import android.Manifest;
import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.os.AsyncTask;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;


public class MainActivity extends AppCompatActivity {
    private ProgressBar bar1;
    private Button button1;
    private int STORAGE_PERMISSION_CODE = 1;


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


        bar1 = findViewById(R.id.bar1);
        button1 = findViewById(R.id.button1);


        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED){
                    new Downlaoder().execute();


                    double appOutput = Finish.ziel;
                    TextView textview = findViewById(R.id.view);
                    textview.setText(String.valueOf(appOutput));
                }
                else{
                    requestStoragePermission();
                }








            }
        });
    }


    class Downlaoder extends AsyncTask<Void, Integer, Integer> {


        @Override
        protected void onPreExecute() {
            super.onPreExecute();


            FFT_Finish.absolut();
            Read_In.target();
            Finish.compute(16000, 90880, FFT_Finish.output);


            bar1.setMax(100);
        }


        @Override
        protected void onProgressUpdate(Integer... values) {
            super.onProgressUpdate(values);






            bar1.setProgress(values[0]);
        }


        @Override
        protected Integer doInBackground(Void... arg0) {
            for(int i=0;i<100;i++){
                publishProgress(i);






                try {
                    Thread.sleep(100);
                }
                catch (InterruptedException ie){
                    ie.printStackTrace();
                }
            }


            return null;
        }


        @Override
        protected void onPostExecute(Integer result) {
            super.onPostExecute(result);


            Toast.makeText(getApplicationContext(), "Download Finished", Toast.LENGTH_LONG).show();
        }
    }


    private void requestStoragePermission(){
        if(ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.READ_EXTERNAL_STORAGE)){
            new AlertDialog.Builder(this).setTitle("Permission needed").setMessage("You must allow the Permission to run the App\n\nAfter this, please enter the Button again").setPositiveButton("ok", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    ActivityCompat.requestPermissions(MainActivity.this, new String[] {Manifest.permission.READ_EXTERNAL_STORAGE}, STORAGE_PERMISSION_CODE);
                }
            })
                    .setNegativeButton("cancle", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            dialog.dismiss();
                        }
                    })
                    .create().show();
        }
        else{
            ActivityCompat.requestPermissions(this, new String[] {Manifest.permission.READ_EXTERNAL_STORAGE}, STORAGE_PERMISSION_CODE);
        }
    }
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if(requestCode == STORAGE_PERMISSION_CODE){
            if(grantResults.length>0 && grantResults[0]==PackageManager.PERMISSION_GRANTED){
                Toast.makeText(this, "Permission GRANTED", Toast.LENGTH_SHORT).show();
            }
            else{
                Toast.makeText(this, "Permission DENIED", Toast.LENGTH_SHORT).show();
            }
        }
    }
}