问题
I am trying to make two toasts: one when the device is charging, and one when it`s not. But the receiver acting crazy, sending many toasts, and crashing the app. I can not find the problem. thnx! This is the receiver in Main activity:
public class PowerConnectionReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||
status == BatteryManager.BATTERY_STATUS_FULL;
if (isCharging){
Toast.makeText(context, "The device is charging", Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(context, "The device is not charging", Toast.LENGTH_SHORT).show();
}
}
}
This is the manifest:
<receiver android:name=".view.MainActivity$PowerConnectionReceiver">
<intent-filter>
<action android:name="android.intent.action.ACTION_POWER_CONNECTED"/>
<action android:name="android.intent.action.ACTION_POWER_DISCONNECTED"/>
</intent-filter>
</receiver>
回答1:
I found a great way to check if the device is charging, or not. Here is the code of the receiver class:
public class PowerConnectionReceiver extends BroadcastReceiver {
public PowerConnectionReceiver() {
}
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(Intent.ACTION_POWER_CONNECTED)) {
Toast.makeText(context, "The device is charging", Toast.LENGTH_SHORT).show();
} else {
intent.getAction().equals(Intent.ACTION_POWER_DISCONNECTED);
Toast.makeText(context, "The device is not charging", Toast.LENGTH_SHORT).show();
}
}
}
Registering it on onResume:
receiver = new PowerConnectionReceiver();
IntentFilter ifilter = new IntentFilter();
ifilter.addAction(Intent.ACTION_POWER_CONNECTED);
ifilter.addAction(Intent.ACTION_POWER_DISCONNECTED);
registerReceiver(receiver, ifilter);
Unregistered on onPause:
unregisterReceiver(receiver);
Works fine!
回答2:
private BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver(){
@Override
public void onReceive(Context arg0, Intent intent) {
// TODO Auto-generated method stub
//this will give you battery current status
try{
int level = intent.getIntExtra("level", 0);
int temp = intent.getIntExtra(BatteryManager.EXTRA_TEMPERATURE, -1);
int voltage = intent.getIntExtra(BatteryManager.EXTRA_VOLTAGE, -1);
int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
String BStatus = "No Data";
if (status == BatteryManager.BATTERY_STATUS_CHARGING){BStatus = "Charging";}
if (status == BatteryManager.BATTERY_STATUS_DISCHARGING){BStatus = "Discharging";}
if (status == BatteryManager.BATTERY_STATUS_FULL){BStatus = "Full";}
if (status == BatteryManager.BATTERY_STATUS_NOT_CHARGING){BStatus = "Not Charging";}
if (status == BatteryManager.BATTERY_STATUS_UNKNOWN){BStatus = "Unknown";}
int chargePlug = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
String BattPowerSource = "No Data";
if (chargePlug == BatteryManager.BATTERY_PLUGGED_AC){BattPowerSource = "AC";}
if (chargePlug == BatteryManager.BATTERY_PLUGGED_USB){BattPowerSource = "USB";}
String BattLevel = String.valueOf(level);
int BHealth = intent.getIntExtra(BatteryManager.EXTRA_HEALTH, -1);
String BatteryHealth = "No Data";
if (BHealth == BatteryManager.BATTERY_HEALTH_COLD){BatteryHealth = "Cold";}
if (BHealth == BatteryManager.BATTERY_HEALTH_DEAD){BatteryHealth = "Dead";}
if (BHealth == BatteryManager.BATTERY_HEALTH_GOOD){BatteryHealth = "Good";}
if (BHealth == BatteryManager.BATTERY_HEALTH_OVER_VOLTAGE){BatteryHealth = "Over-Voltage";}
if (BHealth == BatteryManager.BATTERY_HEALTH_OVERHEAT){BatteryHealth = "Overheat";}
if (BHealth == BatteryManager.BATTERY_HEALTH_UNKNOWN){BatteryHealth = "Unknown";}
if (BHealth == BatteryManager.BATTERY_HEALTH_UNSPECIFIED_FAILURE){BatteryHealth = "Unspecified Failure";}
//Do whatever with the data here
} catch (Exception e){
Log.v(TAG, "Battery Info Error");
}
}
};
You MUST register it dynamically.
Doing so in a service would probably be a good bet. This is what I've used:
this.registerReceiver(this.mBatInfoReceiver,
new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
回答3:
you can use this code
IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
Intent batteryStatus = this.registerReceiver(null, ifilter);
//charging / charged?
int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING || status == BatteryManager.BATTERY_STATUS_FULL;
if(isCharging == true){
tvCharged.setText("CHARGING");
}else{
tvCharged.setText("NOT CHARGING");
}
//how are we charging
int chargePlug = batteryStatus.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;
if(usbCharge == true){
tvHowCharging.setText("USB");
}else{
tvHowCharging.setText("ELECTRICAL OUTLET");
}
//get battery level and print it out
int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
tvLevelOutput.setText(level + " / 100");
pbLevel.setProgress(level);
pbLevel.invalidate();
//get battery temperatur
int temp = batteryStatus.getIntExtra(BatteryManager.EXTRA_TEMPERATURE, -1);
tvTempOutput.setText(temp + "Grad");
pbTemp.incrementProgressBy(temp);
pbTemp.invalidate();
//get battery voltage
int voltage = batteryStatus.getIntExtra(BatteryManager.EXTRA_VOLTAGE, -1);
tvVoltageOutput.setText(voltage + " V");
pbVoltage.incrementProgressBy(voltage);
pbVoltage.invalidate();
回答4:
BroadcastReceiver receives charging state. That's why continuously triggering toast message.
boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||
status == BatteryManager.BATTERY_STATUS_FULL
instead of
boolean isCharging =status= BatteryManager.BATTERY_PLUGGED_AC || plugged == BatteryManager.BATTERY_PLUGGED_USB;
please refer this link: Check if device is plugged in
回答5:
register Receiver in Activity OnResume in place of Manifiest take global variable
boolean isToastShown = false;
and code of receiver is
if (isCharging){
if(!isToastShown){
Toast.makeText(context, "The device is charging", Toast.LENGTH_SHORT).show();
}
}else{
isToastShown = false;
Toast.makeText(context, "The device is not charging", Toast.LENGTH_SHORT).show();
}
回答6:
If you dont want to use the broadcast on your activity, you can use in a service!!
Example:
public class batteryChangeService extends Service {
private BroadcastReceiver mBatteryStateReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(Intent.ACTION_POWER_CONNECTED)) {
Toast.makeText(context, "The device is charging", Toast.LENGTH_SHORT).show();
} else {
intent.getAction().equals(Intent.ACTION_POWER_DISCONNECTED);
Toast.makeText(context, "The device is not charging", Toast.LENGTH_SHORT).show();
}
}
};
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
IntentFilter ifilter = new IntentFilter();
ifilter.addAction(Intent.ACTION_POWER_CONNECTED);
ifilter.addAction(Intent.ACTION_POWER_DISCONNECTED);
registerReceiver(mBatteryStateReceiver, ifilter);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.i("LocalService", "Received start id " + startId + ": " + intent);
return START_NOT_STICKY;
}
@Override
public void onDestroy() {
unregisterReceiver(mBatteryStateReceiver);
}
}
Register the service in your manifest:
<service
android:enabled="true"
android:name="NAME.COMPANY.APPLICATION.batteryChangeService"
android:exported="true"/>
In fact, you can use any BroadcastReceiver inside a service!
来源：https://stackoverflow.com/questions/32608505/broadcast-receiver-monitoring-the-battery-level-and-charging-state