Android的SeekBar和RateBar的使用-android学习之旅（三十二）
16lz
2021-12-12
SeekBar简介
SeekBar允许用户拖动，进行调节经常用于音量调节等方面。
android：thumb设置drawable对象来表示拖动的物体。
setOnSeekBarChangeListener（）设置SeekBar的改变。
代码示例
package peng.liu.test;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.widget.ImageView;import android.widget.SeekBar;public class MainActivity extends Activity { private ImageView image; private SeekBar seekBar; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); image = (ImageView) findViewById(R.id.image); seekBar = (SeekBar) findViewById(R.id.seekBar); seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { @Override public void onProgressChanged(SeekBar seekBar, int i, boolean b) { image.setAlpha(i); } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onStopTrackingTouch(SeekBar seekBar) { } }); }}布局代码
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity" android:orientation="vertical"> <ImageView android:layout_width="fill_parent" android:layout_height="240px" android:id="@+id/image" android:src="@drawable/ic_launcher" android:scaleType="fitXY"/> <SeekBar android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/seekBar" android:max="255" android:progress="255" /></LinearLayout> 效果图
RatingBar简介
RatingBar是一个星级评分条，它和SeekBar有着相同的父类AbsSeekBar，因此属性相似。
RatingBar属性
代码示例
package peng.liu.test;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.widget.ImageView;import android.widget.RatingBar;import android.widget.SeekBar;public class MainActivity extends Activity { private ImageView image; private RatingBar ratingBar; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); image = (ImageView) findViewById(R.id.image); ratingBar = (RatingBar) findViewById(R.id.ratingBar); ratingBar.setOnRatingBarChangeListener(new RatingBar.OnRatingBarChangeListener() { @Override public void onRatingChanged(RatingBar ratingBar, float v, boolean b) { image.setAlpha(v*255/5); } }); }}<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity" android:orientation="vertical"> <ImageView android:layout_width="fill_parent" android:layout_height="240px" android:id="@+id/image" android:src="@drawable/ic_launcher" android:scaleType="fitXY"/> <RatingBar android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/ratingBar" android:max="255" android:progress="255" android:numStars="5" android:stepSize="0.5"/></LinearLayout> 效果图
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