Saturday, February 7, 2015

ProgressDialog and AsyncTask

Example of ProgressDialog, work with AsyncTask.



package com.example.android_er.androidprogressdialog;

import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;


public class MainActivity extends ActionBarActivity {

    Button btnStart;

    MyAsyncTask myAsyncTask;

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

        btnStart=(Button)findViewById(R.id.start);
        btnStart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this,
                        "- Start -",
                        Toast.LENGTH_LONG).show();

                myAsyncTask = new MyAsyncTask();
                myAsyncTask.execute();

            }
        });
    }

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

        boolean running;
        ProgressDialog progressDialog;

        @Override
        protected Void doInBackground(Void... params) {
            int i = 10;
            while(running){
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                if(i-- == 0){
                    running = false;
                }

                publishProgress(i);

            }
            return null;
        }

        @Override
        protected void onProgressUpdate(Integer... values) {
            super.onProgressUpdate(values);
            progressDialog.setMessage(String.valueOf(values[0]));
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            running = true;

            progressDialog = ProgressDialog.show(MainActivity.this,
                    "ProgressDialog",
                    "Wait!");

            progressDialog.setCanceledOnTouchOutside(true);
            progressDialog.setOnCancelListener(new DialogInterface.OnCancelListener() {
                @Override
                public void onCancel(DialogInterface dialog) {
                    running = false;
                }
            });

            Toast.makeText(MainActivity.this,
                    "Progress Start",
                    Toast.LENGTH_LONG).show();
        }

        @Override
        protected void onPostExecute(Void aVoid) {
            super.onPostExecute(aVoid);
            Toast.makeText(MainActivity.this,
                    "Progress Ended",
                    Toast.LENGTH_LONG).show();

            progressDialog.dismiss();
        }

    }

}


<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold" />

    <Button
        android:id="@+id/start"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Start"/>

</LinearLayout>


more:
Too busy in background thread of AsyncTask

5 comments:

Sravani Ch said...

Thank you very much for useful tutorials.
Culd not find this kind of working exmaple anywhere in google.

Sravani Ch said...

Thank you very much for useful example.

Abhijith Thankachen said...

Sir, everything works fine except the green progress animation. What to do ? I can see the space to left of progress message. but the animation is hidden

Andr.oid Eric said...

hello Abhijith Thankachen,

Will it be Too busy in background thread of AsyncTask?

S10KaPTaN said...

Thank you