It's a exercise of a Horizontal ProgressBar which running in a background AsyncTask.
Modify main.xml to have a button to start the progress, and the ProgressBar.
| Code: |
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<Button
android:id="@+id/startprogress"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Start"
/>
<ProgressBar
android:layout_width="fill_parent"
android:layout_height="wrap_content"
style="?android:attr/progressBarStyleHorizontal"
android:id="@+id/progressbar_Horizontal"
android:max="100"
/>
</LinearLayout>
|
Modify the java code.
| Code: |
package com.exercise.AndroidAsyncTaskProgressBar;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.Toast;
public class AndroidAsyncTaskProgressBar extends Activity {
ProgressBar progressBar;
Button buttonStartProgress;
public class BackgroundAsyncTask extends
AsyncTask<Void, Integer, Void> {
int myProgress;
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
Toast.makeText(AndroidAsyncTaskProgressBar.this,
"onPostExecute", Toast.LENGTH_LONG).show();
buttonStartProgress.setClickable(true);
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
Toast.makeText(AndroidAsyncTaskProgressBar.this,
"onPreExecute", Toast.LENGTH_LONG).show();
myProgress = 0;
}
@Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
while(myProgress<100){
myProgress++;
publishProgress(myProgress);
SystemClock.sleep(100);
}
return null;
}
@Override
protected void onProgressUpdate(Integer... values) {
// TODO Auto-generated method stub
progressBar.setProgress(values[0]);
}
}
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
buttonStartProgress = (Button)findViewById(R.id.startprogress);
progressBar = (ProgressBar)findViewById(R.id.progressbar_Horizontal);
progressBar.setProgress(0);
buttonStartProgress.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new BackgroundAsyncTask().execute();
buttonStartProgress.setClickable(false);
}});
}
}
|
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