AsyncTask 2 Example

Demo:

 

1)Activity:

package com.venky.asynctask;

import android.app.Activity;

import android.os.AsyncTask;

import android.os.Bundle;

import android.os.SystemClock;

import android.widget.ProgressBar;

import android.widget.TextView;

import android.widget.Toast;

public class AsyncTask2Activity extends Activity {

      /** Called when the activity is first created. */

      ProgressBar progressBar;

      TextView tv;

      @Override

      public void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);

            setContentView(R.layout.main);

            progressBar = (ProgressBar) findViewById(R.id.progressBar2);

            tv = (TextView) findViewById(R.id.textView1);

            MyAsyncTask myAsyncTask = new MyAsyncTask();

            myAsyncTask.execute();

      }

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

            int progress_status;

            @Override

            protected void onPreExecute() {

                  // TODO Auto-generated method stub

                  progress_status = 0;

                  tv.setText("0 %");

                  super.onPreExecute();

            }

            @Override

            protected Void doInBackground(Void... params) {

                  // TODO Auto-generated method stub

                  while (progress_status < 100) {

                        progress_status += 2;

                        publishProgress(progress_status);

                        SystemClock.sleep(300);

                  }

                  return null;

            }

            @Override

            protected void onProgressUpdate(Integer... values) {

                  // TODO Auto-generated method stub

                  super.onProgressUpdate(values);

                  progressBar.setProgress(values[0]);

                  tv.setText("Download " + values[0] + " %" + " complete");

            }

            @Override

            protected void onPostExecute(Void result) {

                  // TODO Auto-generated method stub

                  Toast.makeText(getApplicationContext(), "Download Complete",

                              Toast.LENGTH_LONG).show();

                  tv.setText("Download Complete");

                  super.onPostExecute(result);

            }

      }

}

2)main.xml: 

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:background="#5F04B4"

    android:orientation="vertical" >

    <ProgressBar

        android:id="@+id/progressBar2"

        style="?android:attr/progressBarStyleHorizontal"

        android:layout_width="200dp"

        android:layout_height="30dp"

        android:layout_gravity="center"

        android:layout_marginTop="70dp" />

    <TextView

        android:id="@+id/textView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_gravity="center"

        android:layout_marginTop="20dp"

        android:text="Medium Text"

        android:textAppearance="?android:attr/textAppearanceMedium" />

</LinearLayout>

3)Download this Project Click Here