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

package lianxi;

import com.example.jichu_lianxi.R;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RatingBar;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;
import android.widget.Toast;

public class SeekBar_Or_RatingBar extends Activity{
    private SeekBar seekbar;     //拖动条
    private TextView text;       //显示拖动条当前值的文本框
    private Button button_star;  //评分按钮
    private RatingBar ratingbar;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.seekbar_or_ratingbar);
        
        seekbar = (SeekBar) findViewById(R.id.seekBar1);
        text = (TextView) findViewById(R.id.now_num);
        button_star = (Button) findViewById(R.id.button_star);
        ratingbar = (RatingBar) findViewById(R.id.ratingBar1);
        //拖动条的响应事件
        seekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {   
            
            //结束拖动时的响应事件
            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                // TODO Auto-generated method stub
                Toast.makeText(SeekBar_Or_RatingBar.this, "结束滑动", Toast.LENGTH_SHORT).show();
                
            }
            //开始拖动时的响应事件
            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
                // TODO Auto-generated method stub
                Toast.makeText(SeekBar_Or_RatingBar.this, "开始滑动", Toast.LENGTH_SHORT).show();
            }
            //拖动过程中的响应事件
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                // TODO Auto-generated method stub
                text.setText("当前值:"+progress);    
            }
        });
        //评分按钮的响应事件
        button_star.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                int result = ratingbar.getProgress(); //获取进度
                float rating = ratingbar.getRating(); //获取等级
                float step = ratingbar.getStepSize(); //获取每次最少要改变多少星级
                Toast.makeText(SeekBar_Or_RatingBar.this, "你得到了"+rating+"颗星", Toast.LENGTH_SHORT).show();
                
                
            }
        });
    }

}

效果图