阅读《Android 从入门到精通》（17）——进度条

来源：互联网发布：淘宝ifashion手机进入编辑：程序博客网时间：2024/05/16 09:37

进度条（ProgressBar）

java.lang.Object;
android.view.View;
android.widget.ProgressBar;

ProgressBar 类方法

ProgressBar 示例

完整工程：http://download.csdn.net/detail/sweetloveft/9416791

下面我们要学习该类中最常用的方法，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 {@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.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">减少</string>    <string name="increase">增加</string>    <string name="custom">自定义进度条</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>

0 0