今天和大家讲一下RatingBar和这个控件的OnRatingBarChangeListener监听

xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:paddingLeft="10dip"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <RatingBar android:id="@+id/ratingbar1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:numStars="3"
        android:rating="2.5" />

    <RatingBar android:id="@+id/ratingbar2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:numStars="5"
        android:rating="2.25" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dip">
        
        <TextView android:id="@+id/rating"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
            
        <RatingBar android:id="@+id/small_ratingbar"
            style="?android:attr/ratingBarStyleSmall"
            android:layout_marginLeft="5dip"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical" />
            
    </LinearLayout>

    <RatingBar android:id="@+id/indicator_ratingbar"
        style="?android:attr/ratingBarStyleIndicator"
        android:layout_marginLeft="5dip"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical" />
            
</LinearLayout>

public class MainActivity   extends Activity implements RatingBar.OnRatingBarChangeListener {
    RatingBar mSmallRatingBar;
    RatingBar mIndicatorRatingBar;
    TextView mRatingText;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.xml);
        
        mRatingText = (TextView) findViewById(R.id.rating);

        // We copy the most recently changed rating on to these indicator-only
        // rating bars
        mIndicatorRatingBar = (RatingBar) findViewById(R.id.indicator_ratingbar);
        mSmallRatingBar = (RatingBar) findViewById(R.id.small_ratingbar);
        
        // The different rating bars in the layout. Assign the listener to us.
        ((RatingBar)findViewById(R.id.ratingbar1)).setOnRatingBarChangeListener(this);
        ((RatingBar)findViewById(R.id.ratingbar2)).setOnRatingBarChangeListener(this);
    }

    public void onRatingChanged(RatingBar ratingBar, float rating, boolean fromTouch) {
        final int numStars = ratingBar.getNumStars();
        mRatingText.setText( 
                getString(R.string.ratingbar_rating) + " " + rating + "/" + numStars);

        // Since this rating bar is updated to reflect any of the other rating
        // bars, we should update it to the current values.
        if (mIndicatorRatingBar.getNumStars() != numStars) {
            mIndicatorRatingBar.setNumStars(numStars);
            mSmallRatingBar.setNumStars(numStars);
        }
        if (mIndicatorRatingBar.getRating() != rating) {
            mIndicatorRatingBar.setRating(rating);
            mSmallRatingBar.setRating(rating);
        }
        final float ratingBarStepSize = ratingBar.getStepSize();
        if (mIndicatorRatingBar.getStepSize() != ratingBarStepSize) {
            mIndicatorRatingBar.setStepSize(ratingBarStepSize);
            mSmallRatingBar.setStepSize(ratingBarStepSize);
        }
    }

}