Handler-- ProgressBar

Handler
參考：http://www.vogella.com/articles/AndroidPerformance/article.html

res/layout/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:orientation="vertical" >

    <TextView

        android:id="@+id/textView"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="Handler" />

    <ProgressBar

        android:id="@+id/progressBar1"

        style="?android:attr/progressBarStyleHorizontal"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:indeterminate="false"

        android:max="10"

        android:padding="4dip" />

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Start Progress" 

        android:onClick="startProgress"/>

</LinearLayout>

*******************************

main.java:

public class Cq_Handler_vogella01Activity extends Activity {

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

private Handler mHandler;

private ProgressBar mProgressBar;

private Button mBtn;

private TextView tv;

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        mProgressBar = (ProgressBar) findViewById(R.id.progressBar1);

        mBtn = (Button) findViewById(R.id.button1);

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

        

        mHandler = new Handler();

        mBtn.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

startProgress();

}

});

    }

    

    public void startProgress () {

    //Do something long

    Runnable runnable = new Runnable() {

@Override

public void run() {

// TODO Auto-generated method stub

for (int i = 0; i<= 10; i++) {

final int value = i;

try {

Thread.sleep(2000);

}catch (InterruptedException e) {

e.printStackTrace();

}

mHandler.post(new Runnable () {// 用來更新 View

@Override

public void run() {

// TODO Auto-generated method stub

mProgressBar.setProgress(value);

tv.setText("the value = " + value );

}

});

}

}

};

new Thread(runnable).start();

    }

}