seekBar，RatingBar拖动条

 RatingBar：星级评分条与拖动条十分相似，它们有相同的父类：AbsSeekBar。

星级评分条：

XML 属性	说明
android:isIndicator	是否允许用户改变 (true 为不允许 )
android:numStars	设置总共有多少颗星星
android:rating	设置默认星级
android:stepSize	设置每次最少需要改变多少个星级

布局文件：

 

<?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"
>

        <ImageView
            android:id="@+id/imagei3"
            android:layout_width="fill_parent"
            android:layout_height="300px"
            android:src="@drawable/i3"
            />

            <TextView
                android:id="@+id/seektv"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_x="150dp"
                android:text="" />


        <SeekBar
            android:id="@+id/seekbar"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:max="100"
            android:progress="50"
            />

        <RatingBar
            android:id="@+id/ratingbar"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:max="100"
            android:progress="50"
            android:isIndicator="false"
            android:numStars="100"
            android:stepSize="0.05"
            />

</LinearLayout>

利用seekbar和Ratingbar改编照片alpha值：

import android.app.Activity;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.RatingBar;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.RatingBar.OnRatingBarChangeListener;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class AndroidtestActivity13 extends Activity {
    private ImageView iv;
    private TextView tv;
    private SeekBar sb;
    private RatingBar rb;
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main13);

            iv=(ImageView) findViewById(R.id.imagei3);
            tv=(TextView) findViewById(R.id.seektv);
            sb=(SeekBar) findViewById(R.id.seekbar);
            rb=(RatingBar) findViewById(R.id.ratingbar);

            iv.setAlpha((int) (sb.getProgress()*2.55));
            tv.setText(String.valueOf(sb.getProgress()));
            rb.setProgress(sb.getProgress());
            //sb.setOnSeekBarChangeListener(seekbarchangelistener);
            rb.setOnRatingBarChangeListener(ratingbarchangelistener);
    }
    //seekbar改变监听事件
    private OnSeekBarChangeListener seekbarchangelistener=new OnSeekBarChangeListener() {

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {
        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {
        }

        @Override
        public void onProgressChanged(SeekBar seekBar, int progress,
                boolean fromUser) {
            iv.setAlpha((int) (progress*2.55));
            tv.setText(String.valueOf(progress));
            rb.setProgress(progress);
        }
    };
    //ratingbar改变监听事件
    private OnRatingBarChangeListener ratingbarchangelistener=new OnRatingBarChangeListener() {

        @Override
        public void onRatingChanged(RatingBar ratingBar, float rating,
                boolean fromUser) {
            iv.setAlpha((int) (rating*2.55));
            tv.setText(String.valueOf(rating));
            sb.setProgress((int) rating);

        }
    };
}

 

本文出自 “个人笔记” 博客，谢绝转载！