阅读《Android 从入门到精通》（17）——进度条 _到精通

男儿欲遂平生志，六经勤向窗前读。这篇文章主要讲述阅读《Android 从入门到精通》（17）——进度条相关的知识，希望能为你提供帮助。
进度条（ProgressBar）java.lang.Object;
android.view.View;
android.widget.ProgressBar;
ProgressBar 类方法

文章图片

文章图片

ProgressBar 演示样例【阅读《Android 从入门到精通》（17）——进度条】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>