关于安卓开发实现拖动条和星级评论

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 }

效果图