Android学习笔记(二十四)

最新推荐文章于 2024-09-07 11:55:45 发布

原创最新推荐文章于 2024-09-07 11:55:45 发布 · 68 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#Android #OS #XML

本文详细介绍了SeekBar和RatingBar两个Android UI组件的使用方法。SeekBar用于显示进度条，并允许用户通过滑动来改变进度；RatingBar则常用于评分场景，用户可以通过点击星星来给出评价等级。文章展示了如何在布局文件中定义这两个组件，并在Activity中设置监听器来响应用户交互。

SeekBar

SeekBarActivity

package org.wp.activity;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.SeekBar;

public class SeekBarActivity extends Activity {
	private static final String TAG = "SeekBarActivity";
	private SeekBar seekBar;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		seekBar = (SeekBar) this.findViewById(R.id.seekBarId);
		// 设置该进度条的最大值
		seekBar.setMax(100);
		seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
			// 当进度条的进度发生变化时,调用该方法
			// fromUser是否用户手动改变进度条
			@Override
			public void onProgressChanged(SeekBar seekBar, int progress,
					boolean fromUser) {
				Log.i(TAG, "onProgressChanged():" + progress);
			}

			// 当用户开始改变进度条进度时候,调用该方法
			@Override
			public void onStartTrackingTouch(SeekBar seekBar) {
				Log.i(TAG, "onStartTrackingTouch():" + seekBar.getProgress());
			}

			// 当用户结束改变进度条进度时候,调用该方法
			@Override
			public void onStopTrackingTouch(SeekBar seekBar) {
				Log.i(TAG, "onStopTrackingTouch():" + seekBar.getProgress());
			}
		});
	}
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   	android:orientation="vertical"
   	android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
	<TextView  
  		android:layout_width="fill_parent" 
    	android:layout_height="wrap_content" 
    	android:text="SeekBar"
   		/>
   	<SeekBar
   		android:layout_width="fill_parent"
   		android:layout_height="wrap_content"
   		android:id="@+id/seekBarId"
   		/>	
</LinearLayout>

RatingBar

RatingBarActivity

package org.wp.activity;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.RatingBar;

public class RatingBarActivity extends Activity {
	private static final String TAG = "RatingBarActivity";
	private RatingBar ratingBar;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		ratingBar = (RatingBar) this.findViewById(R.id.ratingBarId);
		ratingBar.setOnRatingBarChangeListener(new RatingBar.OnRatingBarChangeListener() {
			// rating 分数
			// fromUser 是否来自用户操作
			@Override
			public void onRatingChanged(RatingBar ratingBar, float rating, 
					boolean fromUser) {
				Log.i(TAG, "onRatingChanged()" + rating);
			}
		});
	}
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
	<TextView  
	    android:layout_width="fill_parent" 
	    android:layout_height="wrap_content" 
	    android:text="RatingBar"
	    />
	<RatingBar
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:numStars="5"
		android:stepSize="0.5"
		android:id="@+id/ratingBarId"
		/>    
</LinearLayout>