我需要运行一个控制接近传感器状态的服务(始终在后台,我希望该服务不断检查,即使应用程序已关闭),并在它被覆盖时启动一个活动。我试过但我有错误。有这样的例子吗?
PS 在我的 AndroidManifest 中,我添加了:
<service
android:name="xxx.xxxxx.xxxxx.MyService"
android:enabled="true" />
这是我的 MyService.java :(Eclipse 不报告任何错误,但是当我在我的设备上尝试时,应用程序会强制关闭。)
import android.app.Service;
import android.content.Intent;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.IBinder;
import android.widget.Toast;
public class MyService extends Service implements SensorEventListener {
Sensor proxSensor;
SensorManager sm;
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
Toast.makeText(this, "Service Created", Toast.LENGTH_LONG).show();
sm=(SensorManager)getSystemService(SENSOR_SERVICE);
proxSensor=sm.getDefaultSensor(Sensor.TYPE_PROXIMITY);
sm.registerListener(this, proxSensor, SensorManager.SENSOR_DELAY_NORMAL);
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// TODO Auto-generated method stub
}
@Override
public void onSensorChanged(SensorEvent event) {
// TODO Auto-generated method stub
Intent panel = new Intent(this, Panel.class);
startActivity(panel);
}
@Override
public void onDestroy() {
Toast.makeText(this, "Service Stopped", Toast.LENGTH_LONG).show();
}
@Override
public void onStart(Intent intent, int startid) {
Toast.makeText(this, "Service Started", Toast.LENGTH_LONG).show();
}
}
这里是我的 Main.java :
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import com.lino99.smartTask.R;
public class Main extends Activity implements OnClickListener {
Button buttonStart, buttonStop;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
buttonStart = (Button) findViewById(R.id.buttonStart);
buttonStop = (Button) findViewById(R.id.buttonStop);
buttonStart.setOnClickListener(this);
buttonStop.setOnClickListener(this);
}
public void onClick(View src) {
switch (src.getId()) {
case R.id.buttonStart:
startService(new Intent(this, MyService.class));
break;
case R.id.buttonStop:
stopService(new Intent(this, MyService.class));
break;
}
}
}