关于安卓开发实现拖动条和星级评论

浏览数：20 / 时间：2015年06月11日

拖动条组件(SeekBar)

<SeekBar
        android:id="@+id/seekBar1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="100"      //设置最大值
        android:progress="0"   //设置初值
        android:padding="10px"/>

星级评分条(RatingBar)

<RatingBar
        android:id="@+id/ratingBar1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:numStars="5" //设置几星级
        android:rating="3.5"    //设置初始星级
        android:isIndicator="false"  //设置允许用户改变星级
         />

完整代码

layout

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/now_num"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="当前值:0"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <SeekBar
        android:id="@+id/seekBar1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="100"
        android:progress="0" 
        android:padding="10px"/>

    <RatingBar
        android:id="@+id/ratingBar1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:numStars="5"
        android:rating="3.5"
        android:isIndicator="false"
         />

    <Button
        android:id="@+id/button_star"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="评分" />

</LinearLayout>

java文件

 1 package lianxi;
 2 
 3 import com.example.jichu_lianxi.R;
 4 
 5 import android.app.Activity;
 6 import android.os.Bundle;
 7 import android.util.Log;
 8 import android.view.View;
 9 import android.view.View.OnClickListener;
10 import android.widget.Button;
11 import android.widget.RatingBar;
12 import android.widget.SeekBar;
13 import android.widget.SeekBar.OnSeekBarChangeListener;
14 import android.widget.TextView;
15 import android.widget.Toast;
16 
17 public class SeekBar_Or_RatingBar extends Activity{
18     private SeekBar seekbar;     //拖动条
19     private TextView text;       //显示拖动条当前值的文本框
20     private Button button_star;  //评分按钮
21     private RatingBar ratingbar;
22     @Override
23     protected void onCreate(Bundle savedInstanceState) {
24         // TODO Auto-generated method stub
25         super.onCreate(savedInstanceState);
26         setContentView(R.layout.seekbar_or_ratingbar);
27         
28         seekbar = (SeekBar) findViewById(R.id.seekBar1);
29         text = (TextView) findViewById(R.id.now_num);
30         button_star = (Button) findViewById(R.id.button_star);
31         ratingbar = (RatingBar) findViewById(R.id.ratingBar1);
32         //拖动条的响应事件
33         seekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {   
34             
35             //结束拖动时的响应事件
36             @Override
37             public void onStopTrackingTouch(SeekBar seekBar) {
38                 // TODO Auto-generated method stub
39                 Toast.makeText(SeekBar_Or_RatingBar.this, "结束滑动", Toast.LENGTH_SHORT).show();
40                 
41             }
42             //开始拖动时的响应事件
43             @Override
44             public void onStartTrackingTouch(SeekBar seekBar) {
45                 // TODO Auto-generated method stub
46                 Toast.makeText(SeekBar_Or_RatingBar.this, "开始滑动", Toast.LENGTH_SHORT).show();
47             }
48             //拖动过程中的响应事件
49             @Override
50             public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
51                 // TODO Auto-generated method stub
52                 text.setText("当前值:"+progress);    
53             }
54         });
55         //评分按钮的响应事件
56         button_star.setOnClickListener(new OnClickListener() {
57             
58             @Override
59             public void onClick(View v) {
60                 // TODO Auto-generated method stub
61                 int result = ratingbar.getProgress(); //获取进度
62                 float rating = ratingbar.getRating(); //获取等级
63                 float step = ratingbar.getStepSize(); //获取每次最少要改变多少星级
64                 Toast.makeText(SeekBar_Or_RatingBar.this, "你得到了"+rating+"颗星", Toast.LENGTH_SHORT).show();
65                 
66                 
67             }
68         });
69     }
70 
71 }