RatingBar1.java

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The file containing the source code shown below is located in the corresponding directory in <sdk>/samples/android-<version>/...

/*
 * Copyright (C) 2007 The Android开源工程
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.apis.view;

import android.app.Activity;
import android.os.Bundle;
import android.widget.RatingBar;
import android.widget.TextView;

import com.example.android.apis.R;

/**
 * Demonstrates how to use a rating bar
 */
public class RatingBar1 extends Activity implements RatingBar.OnRatingBarChangeListener {
    RatingBar mSmallRatingBar;
    RatingBar mIndicatorRatingBar;
    TextView mRatingText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.ratingbar_1);

        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);
        }
    }

}