监听电池电量，信号强度，手机状态

监听电池电量：

this.registerReceiver(this.mBatInfoReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));

private BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver() {public void onReceive(Context arg0, Intent intent) {int level = intent.getIntExtra("level", 0);// 电量百分比contentTxt.setText("BAttery : "+String.valueOf(level) + "%");}};

监听手机信号强度，手机状态：

TelephonyManager tm = (TelephonyManager)getSystemService(TELEPHONY_SERVICE);//对TelephonyManager 进行监听，psl为PhoneStateListener，在 psl 中重些了一些方法tm.listen(psl, PhoneStateListener.LISTEN_SIGNAL_STRENGTH|PhoneStateListener.LISTEN_CALL_STATE);

PhoneStateListener psl = new PhoneStateListener(){public void onCallStateChanged(int state, String incomingNumber) {super.onCallStateChanged(state, incomingNumber);Log.v("zzzzzz", "onCallStateChanged : " + state + " PhoneStateListener " + incomingNumber);}public void onSignalStrengthChanged(int asu) {super.onSignalStrengthChanged(asu);signalStrengthTxt.setText("SignalStrength : "+asu);}public void onCallForwardingIndicatorChanged(boolean cfi) {super.onCallForwardingIndicatorChanged(cfi);}public void onCellLocationChanged(CellLocation location) {super.onCellLocationChanged(location);}public void onDataActivity(int direction) {super.onDataActivity(direction);}public void onDataConnectionStateChanged(int state) {super.onDataConnectionStateChanged(state);}public void onMessageWaitingIndicatorChanged(boolean mwi) {super.onMessageWaitingIndicatorChanged(mwi);}public void onServiceStateChanged(ServiceState serviceState) {super.onServiceStateChanged(serviceState);}};各方法的具体作用可以参考android.telephony.PhoneStateListener