本文简单介绍下Android之自定义ProgressBar。

多的不说，先上图

布局文件

activity_main.xml

<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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity"
    android:orientation="vertical" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world"
        android:padding="5dp" />
    <ProgressBar
        android:id="@+id/progress1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="5dp"
        />
    <ProgressBar
        android:id="@+id/progress2"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="100"
        android:progress="60"
        android:secondaryProgress="80"
        android:padding="5dp"/>
    <ProgressBar
        android:id="@+id/progress3"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="100"
        android:progress="60"
        android:secondaryProgress="80"
        android:progressDrawable="@drawable/progress_horizontal"
        android:padding="5dp"/>
    <ProgressBar
        android:id="@+id/progress4"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="fill_parent"
        android:layout_height="25dp"
        android:max="100"
        android:progress="80"
        android:paddingLeft="1dp"
        android:paddingRight="1dp"
        android:progressDrawable="@drawable/progressbar_layer_list"
        android:padding="5dp"/>
    <ProgressBar
        android:id="@+id/progress5"
        android:layout_width="30dip"
        android:layout_height="30dip"
        android:indeterminateDrawable="@drawable/progress_selector"
        android:visibility="visible"
        />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="progress value"
        android:padding="5dp" />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <Button
            android:id="@+id/btn1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="value -"/>
        <Button
            android:id="@+id/btn2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="value +"/>
    </LinearLayout>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="second progress value"
        android:padding="5dp" />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <Button
            android:id="@+id/btn3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="value -"/>
        <Button
            android:id="@+id/btn4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="value +"/>
    </LinearLayout>

</LinearLayout>

布局文件关联的文件

progress_horizontal.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@android:id/background"
        android:drawable="@color/red">
    </item>

    <item android:id="@android:id/secondaryProgress">
        <scale
            android:drawable="@color/green"
            android:scaleWidth="100%" />
    </item>

    <item android:id="@android:id/progress">
        <scale
            android:drawable="@color/blue"
            android:scaleWidth="100%" />
    </item>

</layer-list>

progressbar_layer_list.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

	<item
		android:id="@android:id/background"
		android:drawable="@drawable/pic2">
	</item>

	<item
		android:id="@android:id/progress"
		android:drawable="@drawable/pic1">
	</item>

</layer-list>

progress_selector.xml

<?xml version="1.0" encoding="UTF-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
	android:pivotX="50%"
	android:pivotY="50%"
	android:fromDegrees="0"
	android:toDegrees="360">
	<shape
		android:shape="ring"
		android:innerRadiusRatio="3"
		android:thicknessRatio="8"
		android:useLevel="false">
		<gradient
			android:type="sweep"
			android:useLevel="false"
			android:startColor="#871318"
			android:centerColor="#D5202A"
			android:centerY="0.50"
			android:endColor="#FFEEEE"/>
	</shape>
</rotate>

主程序

package com.sl.progressbardemo;

import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.ProgressBar;
import android.app.Activity;

public class MainActivity extends Activity
{
	private ProgressBar mProgressBar2;
	private ProgressBar mProgressBar3;
	private ProgressBar mProgressBar4;
	private Button mButton1;
	private Button mButton2;
	private Button mButton3;
	private Button mButton4;

	@Override
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_PROGRESS);
		setContentView(R.layout.activity_main);
		setProgressBarVisibility(true);

		mProgressBar2 = (ProgressBar)findViewById(R.id.progress2);
		mProgressBar3 = (ProgressBar)findViewById(R.id.progress3);
		mProgressBar4 = (ProgressBar)findViewById(R.id.progress4);
		mButton1 = (Button)findViewById(R.id.btn1);
		mButton2 = (Button)findViewById(R.id.btn2);
		mButton3 = (Button)findViewById(R.id.btn3);
		mButton4 = (Button)findViewById(R.id.btn4);
		mButton1.setOnClickListener(listener);
		mButton2.setOnClickListener(listener);
		mButton3.setOnClickListener(listener);
		mButton4.setOnClickListener(listener);

	}

	Button.OnClickListener listener = new OnClickListener()
	{
		@Override
		public void onClick(View v)
		{
			Button button = (Button)v;
			switch (button.getId())
			{
			case R.id.btn1:
				mProgressBar2.incrementProgressBy(-5);
				mProgressBar3.incrementProgressBy(-5);
				mProgressBar4.incrementProgressBy(-5);
				break;
			case R.id.btn2:
				mProgressBar2.incrementProgressBy(5);
				mProgressBar3.incrementProgressBy(5);
				mProgressBar4.incrementProgressBy(5);
				break;
			case R.id.btn3:
				mProgressBar2.incrementSecondaryProgressBy(-5);
				mProgressBar3.incrementSecondaryProgressBy(-5);
				break;
			case R.id.btn4:
				mProgressBar2.incrementSecondaryProgressBy(5);
				mProgressBar3.incrementSecondaryProgressBy(5);
				break;
			default:
				break;
			}
		}
	};
}

源码下载