Android之RatingBar

一. 初步认识

src

package cn.android.lyj; import android.app.Activity; import android.os.Bundle; import android.widget.RatingBar; import android.widget.TextView; public class Activity_01 extends Activity implements RatingBar.OnRatingBarChangeListener { RatingBar mSmallRatingBar; RatingBar mIndicatorRatingBar; TextView mRatingText; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mRatingText = (TextView) findViewById(R.id.rating); 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); } //暂时没发现用处 final float ratingBarStepSize = ratingBar.getStepSize(); if (mIndicatorRatingBar.getStepSize() != ratingBarStepSize) { mIndicatorRatingBar.setStepSize(ratingBarStepSize); mSmallRatingBar.setStepSize(ratingBarStepSize); } } }

main.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="5.0" /> <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="10dip" 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>

strings.xml

<?xml version="1.0" encoding="utf-8"?> <resources> <string name= "app_name">RatingBar</string> <string name="ratingbar_rating">Rating:</string> </resources>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="cn.android.lyj" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="10" /> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" > <activity android:label="@string/app_name" android:name=".Activity_01" > <intent-filter > <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
二. 运行结果

启动


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