以下是指南针通过方向传感器而旋转实现。
CompassDemo.java：
package com.example.activity;import android.app.Activity;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 CompassDemo extends Activity implements SensorEventListener {private ImageView imageView;SensorManager mSensorManager;private float currentDegree=0f; @Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.compass); imageView=(ImageView)findViewById(R.id.znzImage); mSensorManager=(SensorManager)getSystemService(SENSOR_SERVICE);} @Override protected void onResume() { mSensorManager.registerListener(this,mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION), SensorManager.SENSOR_DELAY_GAME); super.onResume(); } @Override protected void onPause() { mSensorManager.unregisterListener(this); super.onPause(); } @Override protected void onStop() { mSensorManager.unregisterListener(this); super.onStop(); } @Override public void onAccuracyChanged(Sensor arg0, int arg1) { } @Override public void onSensorChanged(SensorEvent event) { int sensortype=event.sensor.getType(); switch(sensortype){ case Sensor.TYPE_ORIENTATION: float degree=event.values[0]; RotateAnimation ra=new RotateAnimation(currentDegree,-degree,Animation.RELATIVE_TO_SELF,0.5f,Animation.RELATIVE_TO_SELF,0.5f); ra.setDuration(200); imageView.startAnimation(ra); currentDegree=-degree; break; } }}
compass.xml：
在这里给大家分享一下指南针图片znz：
