SeekBar进度条简单案例

SeekBar是进度条。我们使用进度条时，可以使用系统默认的进度条；也可以自定义进度条的图片和滑块图片等

向右拉进度条让图片显示出来

向右拉五角星加载有色进度条

baseSeekBar

package com.shaoxin.myseekbar;import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;/**
 * Created by shaoxin on 2016/12/4.
 */public abstract class baseSeekBar extends AppCompatActivity {    public abstract void init();    public abstract void listener();    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        init();
        listener();
    }}

MainActivity

package com.shaoxin.myseekbar;import android.os.Bundle;
import android.widget.ImageView;
import android.widget.SeekBar;public class MainActivity extends baseSeekBar {
    private ImageView img;
    private SeekBar seekBar2;
    private SeekBar seekBar;    @Override
    public void init() {
        setContentView(R.layout.activity_main);
        img = (ImageView) findViewById(R.id.img);
        seekBar2 = (SeekBar) findViewById(R.id.seekBar2);
        seekBar = (SeekBar) findViewById(R.id.seekBar);
        img.setAlpha(100);
        seekBar2.setProgress(100);
    }    @Override
    public void listener() {
        seekBar2.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                img.setAlpha(progress);
            }            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {            }            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {            }
        });
    }    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);    }
}

activity_main.xml

<?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:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.shaoxin.myseekbar.MainActivity">    <ImageView
        android:id="@+id/img"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher" />    <SeekBar
        android:id="@+id/seekBar2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />    <SeekBar
        android:id="@+id/seekBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="255"
        android:progressDrawable="@drawable/seek_style"
        android:thumb="@drawable/seek_selected" />
</LinearLayout>