Android Application Development Cookbook: 93 Recipes for Building Winning Apps

 
Recipe 2.5 implementing a star Rating system
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53
android:id="@+id/star4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:tag="4" />
android:id="@+id/star5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:tag="5" />

Note that the checkboxes are arranged horizontally and displayed using the star style. Also note that 
each checkbox is tagged using the 
android:tag
attribute. This will be useful later when you need to 
programmatically locate the individual checkbox. 
The following code snippet shows how to implement the star rating system:
package net.learn2develop.checkboxesratings;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.CheckBox;
import android.widget.LinearLayout;
public class MainActivity extends Activity {
LinearLayout rating;
CheckBox star;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//---get the layout containing the stars---
rating = (LinearLayout) findViewById(R.id.ratings);
for (int i = 1; i <= 5; i++) {
star = (CheckBox) rating.findViewWithTag(String.valueOf(i));
star.setOnClickListener(starsListener);
}
}
private OnClickListener starsListener = new OnClickListener() {
public void onClick(View view) {
//---get the tag of the star selected---
int tag = Integer.valueOf((String) view.getTag());
//---check all the stars up to the one touched---
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