Android 借助方向传感器实现 指南针
发布时间:2021-11-21 16:57:34 所属栏目:PHP教程 来源:互联网
导读:step1:新建一个项目Compass,并将一张指南针图片导入到res/drawable-hdpi目录中 1365944950_9473.jpg step2:设计应用的UI界面,main.xml ?xml version=1.0 encoding=utf-8? LinearLayout xmlns:Android=http://schemas.android.com/apk/res/android android:or
step1:新建一个项目Compass,并将一张指南针图片导入到res/drawable-hdpi目录中 1365944950_9473.jpg step2:设计应用的UI界面,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="fill_parent" android:layout_height="fill_parent" android:gravity="center" > <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/compass" android:id="@+id/imageView" /> </LinearLayout> step3:MainActivity.java import android.app.Activity; import android.content.Context; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.os.Bundle; import android.view.animation.Animation; import android.view.animation.RotateAnimation; import android.widget.ImageView; public class MainActivity extends Activity { private ImageView imageView; /** 传感器管理器 */ private SensorManager manager; private SensorListener listener = new SensorListener(); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); imageView = (ImageView) this.findViewById(R.id.imageView); imageView.setKeepScreenOn(true);//屏幕高亮 //获取系统服务(SENSOR_SERVICE)返回一个SensorManager 对象 manager = (SensorManager) getSystemService(Context.SENSOR_SERVICE); } @Override protected void onResume() { /** * 获取方向传感器 * 通过SensorManager对象获取相应的Sensor类型的对象 */ Sensor sensor = manager.getDefaultSensor(Sensor.TYPE_ORIENTATION); //应用在前台时候注册监听器 manager.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_GAME); super.onResume(); } @Override protected void onPause() { //应用不在前台时候销毁掉监听器 manager.unregisterListener(listener); super.onPause(); } private final class SensorListener implements SensorEventListener { private float predegree = 0; @Override public void onSensorChanged(SensorEvent event) { /** * values[0]: x-axis 方向加速度 values[1]: y-axis 方向加速度 values[2]: z-axis 方向加速度 */ float degree = event.values[0];// 存放了方向值 /**动画效果*/ RotateAnimation animation = new RotateAnimation(predegree, degree, Animation.RELATIVE_TO_SELF,0.5f,Animation.RELATIVE_TO_SELF,0.5f); animation.setDuration(200); imageView.startAnimation(animation); predegree=-degree; /** float x=event.values[SensorManager.DATA_X]; float y=event.values[SensorManager.DATA_Y]; float z=event.values[SensorManager.DATA_Z]; Log.i("XYZ", "x="+(int)x+",y="+(int)y+",z="+(int)z); */ } @Override public void onAccuracyChanged(Sensor sensor, int accuracy) { } } } step4:AndroidManifest.xml <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="cn.roco.sensor" android:versionCode="1" android:versionName="1.0"> <uses-sdk android:minSdkVersion="8" /> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name="MainActivity" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest> (编辑:应用网_丽江站长网) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |