Android自带Samples(一)——AccelerometerPlay

本文详细解析了Android SDK自带示例AccelerometerPlay的源代码。从AndroidManifest.xml配置到Activity的生命周期方法,包括传感器数据处理、屏幕锁管理及动画控制等关键实现。

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Android的SDK中有一个$(Android_SDK)/samples/目录,目录下根据不同SDK版本附带了很多自带的例子程序。这一个系列中将会对每一个例子的源代码进行剖析。


本篇文章分析AccelerometerPlay例子:


首先我们看看AndroidManifest.xml文件:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      android:versionCode="1"
      android:versionName="1.0" package="com.example.android.accelerometerplay">
        <!-- android:screenOrientation="portrait" 强制屏幕横屏显示 -->
        <!-- android:theme="@android:style/Theme.NoTitleBar.Fullscreen" 全屏显示 -->
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".AccelerometerPlayActivity"
                  android:label="@string/app_name"
                  android:screenOrientation="portrait" android:theme="@android:style/Theme.NoTitleBar.Fullscreen">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>


<uses-sdk android:minSdkVersion="5"></uses-sdk>
<!-- 允许震动 -->
<uses-permission android:name="android.permission.VIBRATE"></uses-permission>
<!-- 禁止休眠 -->
<uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>

接下来我们看看Acitivity代码(注意工程版本需要设置8以上,而且Acitivity注解需要:@TargetApi(Build.VERSION_CODES.FROYO)):

Activity的onCreate方法:

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // 获取SensorManager、PowerManager、WindowManager
        mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        mPowerManager = (PowerManager) getSystemService(POWER_SERVICE);
        mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        // 获取默认Display
        mDisplay = mWindowManager.getDefaultDisplay();
        // 创建一个屏幕唤醒lock
        mWakeLock = mPowerManager.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK, getClass()
                .getName());

        // 初始化显示View
        mSimulationView = new SimulationView(this);
        setContentView(mSimulationView);
    }

onResume和onPause里面需要获取/释放屏幕锁、开始动画和停止动画。


接下来需要注意的是startSimulation和stopSimulation,同时需要注意onSensorEvent事件处理。






List of Sample Apps The list below provides a summary of the sample applications that are available with the Android SDK. Using the links on this page, you can view the source files of the sample applications in your browser. You can also download the source of these samples into your SDK, then modify and reuse it as you need. For more information, see Getting the Samples. API Demos A variety of small applications that demonstrate an extensive collection of framework topics. Backup and Restore A simple example that illustrates a few different ways for an application to implement support for the Android data backup and restore mechanism. Bluetooth Chat An application for two-way text messaging over Bluetooth. BusinessCard An application that demonstrates how to launch the built-in contact picker from within an activity. This sample also uses reflection to ensure that the correct version of the contacts API is used, depending on which API level the application is running under. Contact Manager An application that demonstrates how to query the system contacts provider using the ContactsContract API, as well as insert contacts into a specific account. Home A home screen replacement application. JetBoy A game that demonstrates the SONiVOX JET interactive music technology, with JetPlayer. Live Wallpaper An application that demonstrates how to create a live wallpaper and bundle it in an application that users can install on their devices. Lunar Lander A classic Lunar Lander game. Multiple Resolutions A sample application that shows how to use resource directory qualifiers to provide different resources for different screen configurations. Note Pad An application for saving notes. Similar (but not identical) to the Notepad tutorial. SampleSyncAdapter Demonstrates how an application can communicate with a cloud-based service and synchronize its data with data stored locally in a content provider. The sample uses two related parts of the Android framework — the account manager and the synchronization manager (through a sync adapter). Searchable Dictionary A sample application that demonstrates Android's search framework, including how to provide search suggestions for Quick Search Box. Snake An implementation of the classic game "Snake." Soft Keyboard An example of writing an input method for a software keyboard. Spinner A simple application that serves as an application-under-test for the SpinnerTest sample application. SpinnerTest An example test application that contains test cases run against the Spinner sample application. To learn more about the application and how to run it, please read the Activity Testing tutorial. TicTacToeLib An example of an Android library project that provides a game-play Activity to any dependent application project. For an example of how an application can use the code and resources in an Android library project, see the TicTacToeMain sample application. TicTacToeMain An example of an Android application that makes use of code and resources provided in an Android library project. Specifically, this application uses code and resources provided in the TicTacToeLib library project. Wiktionary An example of creating interactive widgets for display on the Android home screen. Wiktionary (Simplified) A simple Android home screen widgets example.
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