ProgressDialog doesn't show when I use Intent.

[Oba22]

It's working normally, and the second Asmilitis starts, but... ProgressDialog It doesn't show.

I can't understand why it doesn't work. I saw a lot of similar code and my code is almost like it.
Can anyone find a mistake and tell us how to fix it?

public class StartActivity extends AppCompatActivity {
private Intent mIntent;
private final int totalProgressTime = 100;

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

public void onClick(View view) {

    new DownloadTask().execute();
    mIntent = new Intent(this, MainActivity.class);
    startActivity(mIntent);

}

private class DownloadTask extends AsyncTask<String,Void,Object>{

    ProgressDialog  mIndicator = new ProgressDialog(StartActivity.this);
    @Override
    protected void onPreExecute() {
        super.onPreExecute();

        mIndicator.setMessage("Wait..");
      mIndicator.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        mIndicator.setProgress(0);
        mIndicator.setMax(totalProgressTime );
        mIndicator.show();


        new Thread(new Runnable() {
            @Override
            public void run(){
                int counter = 0;
                while(counter < totalProgressTime ){
                    try {

                        Thread.sleep(300);
                        counter ++;
                        mIndicator.setProgress(counter);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }

                }
                mIndicator.dismiss();
            }
        }).start();

    }

    @Override
    protected Object doInBackground(String... params) {
        return null;
    }

    @Override
    protected void onPostExecute(Object o) {
        super.onPostExecute(o);

        mIndicator.dismiss();
    }
}

}

[Avante]

Then you need to be like this:

public class StartActivity extends Activity {
private final int totalProgressTime = 100;
private int counter = 0;
private ProgressDialog mIndicator = null;
protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mIndicator = new ProgressDialog(StartActivity.this);

mIndicator.setMessage("Wait..");

mIndicator.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

mIndicator.setProgress(0);

mIndicator.setMax(totalProgressTime);

new DownloadTask().execute();

}
private class DownloadTask extends AsyncTask<Void, Integer, Integer> {
@Override
protected void onPreExecute() {
    super.onPreExecute();
    mIndicator.show();
}

@Override
protected Integer doInBackground(Void... params) {
    while(counter &lt; totalProgressTime){
        try {
            publishProgress(++counter);
            Thread.sleep(300);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    return null;
}

@Override
protected void onProgressUpdate(Integer... values) {
    super.onProgressUpdate(values);
    mIndicator.setProgress(values[0]);
}

@Override
protected void onPostExecute(Integer integer) {
    super.onPostExecute(integer);
    mIndicator.dismiss();
    Intent intent = new Intent(StartActivity.this, MainActivity.class);
    startActivity(intent);
}

}

Call startActivity onPostExecute, and roll the cycle to doInBackGround, then get rid of new Thread()

And you must indicate your activity in AndroidManifest as starting the application.

<activity android:name=".StartActivity">

<intent-filter>

<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />

</intent-filter>

</activity>