[Android]开发摇一摇分歧表决器过程-阿里云开发者社区

?心血来潮，走进Android，准备开发一个摇一摇分歧表决器（PS：这个想法源自去年看的一个都市剧《约会专家》中主人公杭杭开发的分歧表决器APP）。

? ?简述：摇一摇分歧表决器是一款Android App，通过将传统的手头剪刀布分歧表决游戏移植到智能手机上，玩家可以通过摇动手机还获取结果，PK对家。（汗！）

? ?目标：一款简单，易用的Android分歧表决App

? ?设备要求：加速传感器，Android系统

? ?涉及知识点：Android ImageView,TextView,RelativeLayout,Sensor,Vibrator,SoundPool

? ?

? ?开始动手：

1.在Eclipse中创建Android 项目

2.准备资源文件，石头，剪刀，布，和玩法示意图，AppIcon四张图片，结果提示音（mp3）

3.创建布局文件（activity_splitter.xml）

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

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

????android:id="@+id/main_layout"

????android:layout_width="match_parent"

????android:layout_height="match_parent"

????android:orientation="vertical"?>

????<ImageView

????????android:id="@+id/image_result"

????????android:layout_width="match_parent"

????????android:layout_height="375dp"

????????android:layout_alignParentTop="true"

????????android:layout_centerHorizontal="true"

????????android:contentDescription="@string/image_desc_msg"

????????android:scaleType="fitXY"

????????android:scrollbars="none"

????????android:src="@drawable/rules"?/>

????<TextView

????????android:id="@+id/text_msg"

????????android:layout_width="match_parent"

????????android:layout_height="match_parent"

????????android:layout_below="@id/image_result"

????????android:layout_centerVertical="true"

????????android:layout_marginTop="50dp"

????????android:gravity="center_horizontal"

????????android:text="@string/user_method_msg"

????????android:textStyle="bold"?/>

</RelativeLayout>

? ? ??

4.实现思路

? 4.1启动App，在ImageView中展示玩法图片，TextView显示玩法说明；

? 4.2玩家摇动手机，应用程序通过加速传感器获得手机加速度，当加速度达到指定范围，发送更新UI界面消息；

? 4.3通过消息处理机制，更新UI界面，在ImageView中展示结果图片（石头，剪刀，布三者之一），TextView显示对应的文字说明，并伴随提示音和轻微震动。

5.开发实现

? 5.1该应用极其简单，仅有一个Activity，在ApplicationManifest.xml中配置启动界面

<activity

????????????android:name=".SplitterActivity"

????????????android:label="@string/app_name"?>

????????????<intent-filter>

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

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

????????????</intent-filter>

????????</activity>

? ??

? 5.2应用程序使用到设备的震动，在ApplicationManifest.xml中配置权限

<uses-permission?android:name="android.permission.VIBRATE"?/>

? 5.3具体开发Activity

? ? 需要熟悉：SensorManager，Sensor，SoundPool，Handler这几个类的使用，自己实现SensorEventListener接口方法，如下onSensorChanged，onAccuracyChanged方法。

public?class?SplitterActivity?extends?Activity?implements?SensorEventListener?{
?

????private?ImageView?imageViewResult;
?

????private?TextView?textViewMsg;
?

????private?int[][]?result?=?new?int[][]?{

????????????{?R.drawable.rock,?R.string.rock_result_msg?},

????????????{?R.drawable.paper,?R.string.paper_result_msg?},

????????????{?R.drawable.scissors,?R.string.scissors_result_msg?}?};
?

????private?SensorManager?sensorManager;
?

????private?Sensor?sensor;
?

????private?Vibrator?vibrator;
?

????private?SoundPool?soundPool;
?

????private?int?streamSoundId;
?

????private?static?final?int?UPDATE_VIEW?=?0x01;
?

????private?Handler?handler?=?new?Handler()?{
?

????????@Override

????????public?void?handleMessage(Message?msg)?{

????????????if?(msg.what?==?UPDATE_VIEW)?{

????????????????if?(vibrator.hasVibrator())?{

????????????????????vibrator.vibrate(new?long[]?{?200L,?500L?},?-1);

????????????????}

????????????????soundPool.play(streamSoundId,?0.5F,?0.5F,?5,?0,?1.0F);
?

????????????????Random?random?=?new?Random();

????????????????int?index?=?random.nextInt(result.length);

????????????????imageViewResult.setImageResource(result[index][0]);

????????????????textViewMsg.setText(result[index][1]);

????????????}

????????}

????};
?

????public?SplitterActivity()?{

????}
?

????@Override

????protected?void?onCreate(Bundle?savedInstanceState)?{

????????super.onCreate(savedInstanceState);

????????this.setContentView(R.layout.activity_splitter);
?

????????imageViewResult?=?(ImageView)?this.findViewById(R.id.image_result);

????????textViewMsg?=?(TextView)?this.findViewById(R.id.text_msg);
?

????????sensorManager?=?(SensorManager)?this.getSystemService(SENSOR_SERVICE);

????????sensor?=?sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);

????????vibrator?=?(Vibrator)?this.getSystemService(VIBRATOR_SERVICE);
?

????????soundPool?=?new?SoundPool(10,?AudioManager.STREAM_SYSTEM,?5);

????????streamSoundId?=?soundPool.load(this,?R.raw.call_result,?0);
?

????}
?

????@Override

????protected?void?onResume()?{

????????super.onResume();

????????sensorManager.registerListener(this,?sensor,

????????????????SensorManager.SENSOR_DELAY_NORMAL);

????}
?

????@Override

????protected?void?onStop()?{

????????sensorManager.unregisterListener(this);

????????if?(null?!=?vibrator)?{

????????????vibrator.cancel();

????????????vibrator?=?null;

????????}
?

????????if?(null?!=?soundPool)?{

????????????soundPool.release();

????????????soundPool?=?null;

????????}

????????super.onStop();

????}
?

????@Override

????public?void?onSensorChanged(SensorEvent?event)?{
?

????????if?(event.sensor.getType()?==?Sensor.TYPE_ACCELEROMETER)?{

????????????float[]?values?=?event.values;

????????????if?(isNormalAcceler(values))?{
?

????????????????new?Thread(new?Runnable()?{
?

????????????????????@Override

????????????????????public?void?run()?{

????????????????????????Message?msg?=?new?Message();

????????????????????????msg.what?=?UPDATE_VIEW;

????????????????????????handler.sendMessage(msg);

????????????????????}

????????????????}).start();

????????????}

????????}

????}
?

????private?boolean?isNormalAcceler(float[]?values)?{

????????int?g?=?15;

????????return?(Math.abs(values[0])?>?g?&&?Math.abs(values[1])?>?g)

????????????????||?Math.abs(values[2])?>?g;

????}
?

????@Override

????public?void?onAccuracyChanged(Sensor?sensor,?int?accuracy)?{
?

????}
?

????@Override

????public?boolean?onKeyDown(int?keyCode,?KeyEvent?event)?{

????????if?(keyCode?==?KeyEvent.KEYCODE_BACK)?{

????????????BackListener?backListener?=?new?BackListener();

????????????new?AlertDialog.Builder(this)

????????????????????.setIcon(android.R.drawable.ic_dialog_info)

????????????????????.setTitle(R.string.app_name)

????????????????????.setMessage(R.string.exite_app_info)

????????????????????.setPositiveButton(R.string.leave,?backListener)

????????????????????.setNegativeButton(R.string.without,?backListener).show();

????????????return?true;

????????}

????????return?super.onKeyDown(keyCode,?event);

????}
?

????private?class?BackListener?implements?DialogInterface.OnClickListener?{
?

????????@Override

????????public?void?onClick(DialogInterface?dialog,?int?which)?{

????????????switch?(which)?{

????????????case?DialogInterface.BUTTON_POSITIVE:

????????????????SplitterActivity.this.finish();

????????????????break;

????????????case?DialogInterface.BUTTON_NEGATIVE:

????????????????break;

????????????default:

????????????????break;

????????????}

????????}

????}
}