activity_main.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/rl"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="10dp"
tools:context=".MainActivity"
android:background="#f9fff5"
>
<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Start Operation"
android:layout_marginTop="10dp"
/>
</RelativeLayout>
MainActivity.java
package com.cfsuman.me.androidcodesnippets;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.os.Handler;
import android.app.ProgressDialog;
public class MainActivity extends Activity {
private int progressStatus = 0;
private Handler handler = new Handler();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Get the widgets reference from XML layout
final RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);
final Button btn = (Button) findViewById(R.id.btn);
// Set a click listener for button widget
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// Initialize a new instance of progress dialog
final ProgressDialog pd = new ProgressDialog(MainActivity.this);
// Set progress dialog style horizontal
pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
// Set the progress dialog background color transparent
pd.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
pd.setIndeterminate(false);
// Finally, show the progress dialog
pd.show();
// Set the progress status zero on each button click
progressStatus = 0;
// Start the lengthy operation in a background thread
new Thread(new Runnable() {
@Override
public void run() {
while(progressStatus < 100){
// Update the progress status
progressStatus +=1;
// Try to sleep the thread for 20 milliseconds
try{
Thread.sleep(20);
}catch(InterruptedException e){
e.printStackTrace();
}
// Update the progress bar
handler.post(new Runnable() {
@Override
public void run() {
// Update the progress status
pd.setProgress(progressStatus);
// If task execution completed
if(progressStatus == 100){
// Dismiss/hide the progress dialog
pd.dismiss();
}
}
});
}
}
}).start(); // Start the operation
}
});
}
}


