进度条

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.hanqi.textapp2.jindutiaoActivity">
    <ProgressBar
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        style="?android:attr/progressBarStyleHorizontal"
        android:progress="50"
        android:secondaryProgress="60"
        android:max="90"
        android:id="@+id/sb2"/>
    <ProgressBar
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        style="?android:attr/progressBarStyleSmall"
        android:progress="50"
        android:secondaryProgress="60"
        android:max="255"
        android:id="@+id/sb3"
        android:visibility="visible"
        />

    <SeekBar
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:progress="100"
        android:secondaryProgress="60"
        android:max="255"
        android:id="@+id/sb1"/>

    <RatingBar
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:numStars="6"
        android:rating="3.5"
        android:isIndicator="false"/>
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/aaa"
        android:id="@+id/sb4"
        />

</LinearLayout>

视图代码

package com.hanqi.textapp2;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.SeekBar;

public class jindutiaoActivity extends AppCompatActivity {
    SeekBar sb1;
    ProgressBar sb2;
    ProgressBar sb3;
   int jd;
    ImageView sb4;

    //AlertDialog ad= new AlertDialog.Builder(this).create();


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_jindutiao);
        sb1=(SeekBar)findViewById(R.id.sb1);
        sb2=(ProgressBar)findViewById(R.id.sb2);
        sb3=(ProgressBar)findViewById(R.id.sb3);
        sb4=(ImageView)findViewById(R.id.sb4);
        //需要在java里预设一下，范围1-255
        sb4.setImageAlpha(1);
        //sb4.setAlpha(1);

        sb1.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                //只要progress变化就会被触发
                //Toast.makeText(jindutiaoActivity.this, "当前进度=" + progress, Toast.LENGTH_SHORT).show();

                jd=progress;
               // String jd2=jd+"";
                //Float jd1=Float.parseFloat(jd2);
                //中划线-方法废弃不建议使用
                //sb4.setAlpha(jd/100);
                //sb4.setAlpha(jd/100.0f);
               //sb4.setAlpha(jd1);

                //该方法版本不支持16以下的
                //方法接收值的范围是255；
                sb4.setImageAlpha(jd);

               // Toast.makeText(jindutiaoActivity.this, "当前进度="+sb4.getAlpha(), Toast.LENGTH_SHORT).show();

                sb2.setProgress(jd);
                if(jd==sb2.getMax()){
                   sb3.setVisibility(View.INVISIBLE);//不显示位置保留
                }
                else {
                    sb3.setVisibility(View.VISIBLE);
                }

            }

            @Override
                public void onStartTrackingTouch(SeekBar seekBar) {
                Log.e("TAG","进度条开始拖动了");

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                Log.e("TAG","进度条停止拖动了");
            }
        });


    }
}

java代码