进度条（ProgressBar）

java.lang.Object;

android.view.View;

android.widget.ProgressBar;

ProgressBar 类方法

ProgressBar 演示样例

完整project：http://download.csdn.net/detail/sweetloveft/9416791

以下我们要学习该类中最经常使用的方法。主要是 setMax 和 setProgress 等方法。

1.MainActivity.java

package com.sweetlover.activity;

import com.sweetlover.progressbar.R;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.ProgressBar;

public class MainActivity extends Activity {

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		// TODO Auto-generated method stub

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

		final ProgressBar progressHorizontal = (ProgressBar) findViewById(R.id.progress_horizontal);

        setProgress(progressHorizontal.getProgress() * 100);

        setSecondaryProgress(progressHorizontal.getSecondaryProgress() * 100);

        Button button = (Button) findViewById(R.id.increase);

        button.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {

                progressHorizontal.incrementProgressBy(1);

                // Title progress is in range 0..10000

                setProgress(100 * progressHorizontal.getProgress());

            }

        });

        button = (Button) findViewById(R.id.decrease);

        button.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {

                progressHorizontal.incrementProgressBy(-1);

                // Title progress is in range 0..10000

                setProgress(100 * progressHorizontal.getProgress());

            }

        });

        button = (Button) findViewById(R.id.increase_secondary);

        button.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {

                progressHorizontal.incrementSecondaryProgressBy(1);

                // Title progress is in range 0..10000

                setSecondaryProgress(100 * progressHorizontal.getSecondaryProgress());

            }

        });

        button = (Button) findViewById(R.id.decrease_secondary);

        button.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {

                progressHorizontal.incrementSecondaryProgressBy(-1);

                // Title progress is in range 0..10000

                setSecondaryProgress(100 * progressHorizontal.getSecondaryProgress());

            }

        });

	}

}

2.activity_main.xml

<?

xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="match_parent"

    android:layout_height="wrap_content"

    android:padding="30dp" >

    <ProgressBar android:id="@+id/progress_horizontal"

        style="?

android:attr/progressBarStyleHorizontal"

        android:layout_width="200dip"

        android:layout_height="wrap_content"

        android:layout_gravity="center"

        android:max="100"

        android:progress="50"

        android:secondaryProgress="75" />

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_gravity="center"

        android:layout_marginTop="20dp"

        android:text="@string/normal" />

    <LinearLayout

        android:orientation="horizontal"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:gravity="center"

        android:layout_marginTop="20dp" >

        <Button

            android:id="@+id/decrease"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="@string/decrease" />

        <Button

            android:id="@+id/increase"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="@string/increase" />

    </LinearLayout>

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_gravity="center"

        android:layout_marginTop="20dp"

        android:text="@string/custom" />

    <LinearLayout

        android:orientation="horizontal"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:gravity="center"

        android:layout_marginTop="20dp" >

        <Button

            android:id="@+id/decrease_secondary"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="@string/decrease" />

        <Button

            android:id="@+id/increase_secondary"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="@string/increase" />

    </LinearLayout>

</LinearLayout>

3.strings.xml

<resources>

    <string name="app_name">ProgressBar</string>

    <string name="normal">默认进度条</string>

    <string name="decrease">降低</string>

    <string name="increase">添加</string>

    <string name="custom">自己定义进度条</string>

</resources>

4.AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.sweetlover.progressbar"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="19" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity android:name="com.sweetlover.activity.MainActivity">

            <intent-filter>

                <action android:name="android.intent.action.MAIN"/>

                <category android:name="android.intent.category.LAUNCHER"/>

            </intent-filter>

        </activity>

    </application>

</manifest>