我正在尝试学习Android应用程序开发,并编写了一个非常简单的应用程序,其中包含一个调用服务的活动。该服务将测量的加速度广播到活动。问题是服务运行正常,但它不会将数据发送回活动。从来没有打过onReceive on my receiver。此外,当活动结束时,有一个例外,说我的接收器尚未注册。下面是我的服务,活动和manifest.xml的代码。任何帮助将非常感谢。
活动呼叫服务:
package com.practice;
import com.practice.SimpleService;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.util.Log;
import android.view.Window;
public class ServiceActivity extends Activity {
MyReceiver myReceiver=null;
Intent i;
static final String LOG_TAG = "ServiceActivity";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
Log.d( LOG_TAG, "onCreate" );
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
//Start service
i= new Intent(this, com.practice.SimpleService.class);
Log.d( LOG_TAG, "onCreate/startService" );
}
@Override
public void onResume(){
super.onResume();
Log.d( LOG_TAG, "onResume/registering receiver" );
//Register BroadcastReceiver to receive accelerometer data from service
//if (myReceiver == null){
myReceiver = new MyReceiver();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(SimpleService.MY_ACTION);
startService(i);
registerReceiver(myReceiver, intentFilter);
//}
}
@Override
public void onPause(){
super.onPause();
Log.d( LOG_TAG, "onPause/unregistering receiver" );
stopService(i);
if (myReceiver != null)unregisterReceiver(myReceiver);
}
@Override
protected void onStop(){
super.onStop();
Log.d( LOG_TAG, "onStop" );
if (myReceiver != null) unregisterReceiver (myReceiver);
stopService(i);
}
private class MyReceiver extends BroadcastReceiver{
static final String Log_Tag = "MyReceiver";
@Override
public void onReceive(Context arg0, Intent arg1){
Log.d( LOG_TAG, "onReceive" );
String measurement = arg1.getStringExtra("measurement");
System.out.println("I am here");
}
}
}
获取传感器数据的服务:
package com.practice;
import java.util.List;
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.util.Log;
import android.widget.TextView;
public class SimpleService extends Service implements SensorEventListener{
final static String MY_ACTION = "MY_ACTION";
private TextView output;
private String reading;
private SensorManager mgr;
private List<Sensor> sensorList;
static final String LOG_TAG = "SimpleService";
Intent intent = new Intent("com.practice.SimpleService.MY_ACTION");
@Override
//public void onStartCommand() {
public void onCreate() {
Log.d( LOG_TAG, "onStartCommand" );
mgr = (SensorManager) getSystemService(SENSOR_SERVICE);
sensorList = mgr.getSensorList(Sensor.TYPE_ACCELEROMETER);
for (Sensor sensor : sensorList) {
mgr.registerListener(this, sensor,
SensorManager.SENSOR_DELAY_NORMAL);
}
}
@Override
public void onDestroy() {
Log.d( LOG_TAG, "onDestroy" );
mgr.unregisterListener(this);
super.onDestroy();
}
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// TODO Auto-generated method stub
}
@Override
public void onSensorChanged(SensorEvent event) {
Log.d( LOG_TAG, "onSensorChanged" );
StringBuilder builder = new StringBuilder();
for (int i = 0; i < event.values.length; i++) {
builder.append(" [");
builder.append(i);
builder.append("] = ");
builder.append(event.values[i]);
builder.append("\n");
}
reading=builder.toString();
//Send back reading to Activity
intent.putExtra("measurement", reading);
sendBroadcast(intent);
}
}
的Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.practice"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".ServiceActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".SimpleService" ></service>
</application>
</manifest>
答案 0 :(得分:1)
创建自定义意图:
final static String MY_ACTION = "com.practice.SimpleService.MY_ACTION";
在Manifest.xml中
<receiver android:name=".MyReceiver" android:enabled="true">
<intent-filter>
<action android:name="com.practice.SimpleService.MY_ACTION"></action>
</intent-filter>
</receiver>
有关自定义广播的详细信息,请参阅Custom Intents and Broadcasting with Receivers