当设备在Android上启动时,我一直在尝试启动服务,但我无法让它工作.我在网上看了很多链接,但没有一个代码可以工作.我忘记了什么吗？
<receiver
android:name=".StartServiceAtBootReceiver"
android:enabled="true"
android:exported="false"
android:label="StartServiceAtBootReceiver" >
<intent-filter>
<action android:name="android.intent.action._BOOT_COMPLETED" />
</intent-filter>
</receiver>
<service
android:name="com.test.RunService"
android:enabled="true" />
public void onReceive(Context context, Intent intent) {
if ("android.intent.action.BOOT_COMPLETED".equals(intent.getAction())) {
Intent serviceLauncher = new Intent(context, RunService.class);
context.startService(serviceLauncher);
Log.v("TEST", "Service loaded at start");
}
}
有没有可靠的方法来获得Context一个Service？
我想注册广播接收器,ACTION_PHONE_STATE_CHANGED但我不需要我的应用程序总是得到这些信息,所以我不把它放在Manifest.
但是,当我需要这些信息时,我不能让GC杀死广播接收器,因此我正在注册广播接收器Service.
因此,我需要一个Context来打电话registerReceiver().当我不再需要时,ACTION_PHONE_STATE_CHANGED我取消注册它.
有小费吗？
我需要检查我的注册接收者是否仍然注册,如果不是我如何检查任何方法？
api android broadcastreceiver android-broadcast android-broadcastreceiver
我正在开发一个用于检查互联网连接的Android广播接收器.
问题是我的广播接收器被调用了两次.我希望它只在网络可用时才被调用.如果它不可用,我不希望得到通知.
这是广播接收器
public class NetworkChangeReceiver extends BroadcastReceiver {
@Override
public void onReceive(final Context context, final Intent intent) {
final ConnectivityManager connMgr = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
final android.net.NetworkInfo wifi = connMgr
.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
final android.net.NetworkInfo mobile = connMgr
.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
if (wifi.isAvailable() || mobile.isAvailable()) {
// Do something
Log.d("Network Available ", "Flag No 1");
}
}
}
这是manifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.broadcastreceiverforinternetconnection"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<receiver android:name=".NetworkChangeReceiver" >
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" …java android broadcastreceiver android-networking android-wifi
我尝试在此链接中使用示例代码,但它似乎已过时,但它不起作用.那么当Android完成启动时,我需要做些什么更改以及让我的应用自动启动哪些文件？
我想知道以编程方式注册广播接收器的最佳实践/方法是什么.我想根据用户的选择注册特定的接收器.
由于注册是通过清单文件完成的,我想知道是否有一种正确的方法可以在代码中实现这一点.
我已经弄明白了如何发送和接收短信.要发送短信,我必须调用该类的sendTextMessage()和sendMultipartTextMessage()方法SmsManager.要接收SMS消息,我必须在AndroidMainfest.xml文件中注册接收器.然后我不得不重写onReceive()方法BroadcastReceiver.我在下面列举了一些例子.
MainActivity.java
public class MainActivity extends Activity {
private static String SENT = "SMS_SENT";
private static String DELIVERED = "SMS_DELIVERED";
private static int MAX_SMS_MESSAGE_LENGTH = 160;
// ---sends an SMS message to another device---
public static void sendSMS(String phoneNumber, String message) {
PendingIntent piSent = PendingIntent.getBroadcast(mContext, 0, new Intent(SENT), 0);
PendingIntent piDelivered = PendingIntent.getBroadcast(mContext, 0,new Intent(DELIVERED), 0);
SmsManager smsManager = SmsManager.getDefault();
int length = message.length();
if(length > MAX_SMS_MESSAGE_LENGTH) …我有一个需要捕获两个不同广播的Android活动.我目前的方法是BroadcastReceiver在Activity中使用一个单独的方法来捕获广播:
public class MyActivity extends Activity {
private MyActivity.BroadcastListener mBroadcastListener;
private boolean mIsActivityPaused = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mylayout);
// Create the broadcast listener and register the filters
mIsActivityPaused = false;
mBroadcastListener = new BroadcastListener();
IntentFilter filter = new IntentFilter();
filter.addAction(Params.INTENT_REFRESH);
filter.addAction(Params.INTENT_UPDATE);
registerReceiver(mBroadcastListener, filter);
}
@Override
protected void onResume() {
super.onResume();
mIsActivityPaused = false;
}
@Override
protected void onPause() {
super.onPause();
mIsActivityPaused = true;
}
@Override
protected void onDestroy() {
unregisterReceiver(mBroadcastListener);
super.onDestroy();
}
private …在我的开发者控制台中,人们不断报告我无法在任何手机上重现的错误.一个人在尝试打开电池服务的设置屏幕时留下了一条消息说他得到了它.从错误中可以看出,它表示接收器未注册.
java.lang.RuntimeException: Unable to stop service .BatteryService@4616d688: java.lang.IllegalArgumentException: Receiver not registered: com.app.notifyme.BatteryService$BatteryNotifyReceiver@4616d9d0
at android.app.ActivityThread.handleStopService(ActivityThread.java:3164)
at android.app.ActivityThread.access$3900(ActivityThread.java:129)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2173)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:143)
at android.app.ActivityThread.main(ActivityThread.java:4701)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalArgumentException: Receiver not registered:com..BatteryService$BatteryNotifyReceiver@4616d9d0
at android.app.ActivityThread$PackageInfo.forgetReceiverDispatcher(ActivityThread.java:805)
at android.app.ContextImpl.unregisterReceiver(ContextImpl.java:859)
at android.content.ContextWrapper.unregisterReceiver(ContextWrapper.java:331)
at com.app.notifyme.BatteryService.onDestroy(BatteryService.java:128)
at android.app.ActivityThread.handleStopService(ActivityThread.java:3150)
我注册的是我的onCreate
@Override
public void onCreate(){
super.onCreate();
SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(this);
IntentFilter filter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
filter.addAction(Intent.ACTION_POWER_CONNECTED);
filter.addAction(Intent.ACTION_POWER_DISCONNECTED);
registerReceiver(batteryNotifyReceiver,filter);
pref.registerOnSharedPreferenceChangeListener(this);
}
取消注册onDestroy以及首选项侦听器
@Override
public void onDestroy(){
super.onDestroy();
unregisterReceiver(batteryNotifyReceiver);
} …