小巧指南針

</pre><pre code_snippet_id="1840629" snippet_file_name="blog_20160819_2_6137175" name="code" class="java">方便好用，界面簡潔。

先上圖

</pre><pre code_snippet_id="1840629" snippet_file_name="blog_20160819_4_2691612" name="code" class="java"></pre><pre code_snippet_id="1840629" snippet_file_name="blog_20160819_4_2691612" name="code" class="java">

<pre name="code" class="java">package co.cn.com.conpass;



import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorListener;
import android.hardware.SensorManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Window;
import android.view.animation.Animation;
import android.view.animation.RotateAnimation;
import android.widget.ImageView;

public class MainActivity extends Activity implements SensorEventListener {
    ImageView image,imageView1;  //指南針圖片
    float currentDegree = 0f; //指南針圖片轉過的角度

    SensorManager mSensorManager; //管理器

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);

        image = (ImageView)findViewById(R.id.image);
        imageView1 = (ImageView) findViewById(R.id.short_ima);

        mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE); //獲取管理服務
    }

    @Override
    protected void onResume(){
        super.onResume();
        //註冊監聽器
        mSensorManager.registerListener((SensorEventListener) this
                , mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION), SensorManager.SENSOR_DELAY_GAME);
    }

    //取消註冊
    @Override
    protected void onPause(){
        mSensorManager.unregisterListener(this);
        super.onPause();

    }

    @Override
    protected void onStop(){
        mSensorManager.unregisterListener(this);
        super.onStop();

    }

    //傳感器值改變

    @Override
    public void onSensorChanged(SensorEvent event) {
     //   獲取觸發event的傳感器類型
        int sensorType = event.sensor.getType();

        switch(sensorType){
            case Sensor.TYPE_ORIENTATION:
                float degree = event.values[0]; //獲取z轉過的角度
                //穿件旋轉動畫
                RotateAnimation ra = new RotateAnimation(currentDegree,-degree, Animation.RELATIVE_TO_SELF,0.5f
                        ,Animation.RELATIVE_TO_SELF,0.5f);
                ra.setDuration(100);//動畫持續時間
                image.startAnimation(ra);
                imageView1.setAnimation(ra);
                currentDegree = -degree;
                break;

        }
    }

    public void onAccuracyChanged(Sensor sensor, int accuracy) {
        // TODO Auto-generated method stub


    }
    //精度改變

//    public void onSensorChanged(SensorEvent event) {
//        // TODO Auto-generated method stub
//        //獲取觸發event的傳感器類型
//        int sensorType = event.sensor.getType();
//
//        switch(sensorType){
//            case Sensor.TYPE_ORIENTATION:
//                float degree = event.values[0]; //獲取z轉過的角度
//                //穿件旋轉動畫
//                RotateAnimation ra = new RotateAnimation(currentDegree,-degree, Animation.RELATIVE_TO_SELF,0.5f
//                        ,Animation.RELATIVE_TO_SELF,0.5f);
//                ra.setDuration(100);//動畫持續時間
//                image.startAnimation(ra);
//                currentDegree = -degree;
//                break;
//
//        }
//    }


}