android中电池电量的自动更新
我正在使用此代码显示我的应用程序中的电池电量。它工作正常,但不会自动更新电池电量android中电池电量的自动更新,android,Android,我正在使用此代码显示我的应用程序中的电池电量。它工作正常,但不会自动更新电池电量 public class MainActivity extends Activity { private TextView txtBattery; private BroadcastReceiver mBatteryLevelReciver = new BroadcastReceiver() { @Override pub
public class MainActivity extends Activity {
private TextView txtBattery;
private BroadcastReceiver mBatteryLevelReciver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
context.unregisterReceiver(this);
//int rawLevel = intent.getIntExtra("level", -1);
int rawLevel = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
//int scale = intent.getIntExtra("scale", -1);
int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
int level = -1;
if (rawLevel >= 0 && scale > 0) {
level = (rawLevel * 100) / scale;
}
txtBattery.setText("Battery3 Level Remaining :" + level + "%");
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
txtBattery = (TextView) findViewById(R.id.batterymeter_txt);
batteryLevel();
}
private void batteryLevel() {
IntentFilter batteryLevelFliter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
registerReceiver(mBatteryLevelReciver, batteryLevelFliter);
}
}
如何自动更新电池电量
public class MainActivity extends Activity {
private TextView txtBattery;
private BroadcastReceiver mBatteryLevelReciver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
context.unregisterReceiver(this);
//int rawLevel = intent.getIntExtra("level", -1);
int rawLevel = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
//int scale = intent.getIntExtra("scale", -1);
int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
int level = -1;
if (rawLevel >= 0 && scale > 0) {
level = (rawLevel * 100) / scale;
}
txtBattery.setText("Battery3 Level Remaining :" + level + "%");
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
txtBattery = (TextView) findViewById(R.id.batterymeter_txt);
batteryLevel();
}
private void batteryLevel() {
IntentFilter batteryLevelFliter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
registerReceiver(mBatteryLevelReciver, batteryLevelFliter);
}
}
将receiver变量移动为class属性,以便在接收到意图时将其保存在内存中:
public class Main extends Activity {
private TextView txtBattery;
private BroadcastReceiver mBatteryLevelReciver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
//int rawLevel = intent.getIntExtra("level", -1);
int rawLevel = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
//int scale = intent.getIntExtra("scale", -1);
int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
int level = -1;
if (rawLevel >= 0 && scale > 0) {
level = (rawLevel * 100) / scale;
}
txtBattery.setText("Battery Level Remaining :" + level + "%");
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
txtBattery = (TextView) findViewById(R.id.batterymeter_txt);
batteryLevel();
}
private void batteryLevel() {
IntentFilter batteryLevelFliter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
registerReceiver(batteryLevelReciver, batteryLevelFliter);
}
为什么要在
onReceive()
方法中注销您的BroadcastReceiver
context.unregisterReceiver(this);
删除该选项。尝试此代码
public class AndroidBattery extends Activity {
private TextView batteryLevel, batteryVoltage, batteryTemperature,
batteryTechnology, batteryStatus, batteryHealth;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
batteryLevel = (TextView)findViewById(R.id.batterylevel);
batteryVoltage = (TextView)findViewById(R.id.batteryvoltage);
batteryTemperature = (TextView)findViewById(R.id.batterytemperature);
batteryTechnology = (TextView)findViewById(R.id.batterytechology);
batteryStatus = (TextView)findViewById(R.id.batterystatus);
batteryHealth = (TextView)findViewById(R.id.batteryhealth);
this.registerReceiver(this.myBatteryReceiver,
new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
}
private BroadcastReceiver myBatteryReceiver
= new BroadcastReceiver(){
@Override
public void onReceive(Context arg0, Intent arg1) {
// TODO Auto-generated method stub
if (arg1.getAction().equals(Intent.ACTION_BATTERY_CHANGED)){
batteryLevel.setText("Level: "
+ String.valueOf(arg1.getIntExtra("level", 0)) + "%");
batteryVoltage.setText("Voltage: "
+ String.valueOf((float)arg1.getIntExtra("voltage", 0)/1000) + "V");
batteryTemperature.setText("Temperature: "
+ String.valueOf((float)arg1.getIntExtra("temperature", 0)/10) + "c");
batteryTechnology.setText("Technology: " + arg1.getStringExtra("technology"));
int status = arg1.getIntExtra("status", BatteryManager.BATTERY_STATUS_UNKNOWN);
String strStatus;
if (status == BatteryManager.BATTERY_STATUS_CHARGING){
strStatus = "Charging";
} else if (status == BatteryManager.BATTERY_STATUS_DISCHARGING){
strStatus = "Dis-charging";
} else if (status == BatteryManager.BATTERY_STATUS_NOT_CHARGING){
strStatus = "Not charging";
} else if (status == BatteryManager.BATTERY_STATUS_FULL){
strStatus = "Full";
} else {
strStatus = "Unknown";
}
batteryStatus.setText("Status: " + strStatus);
int health = arg1.getIntExtra("health", BatteryManager.BATTERY_HEALTH_UNKNOWN);
String strHealth;
if (health == BatteryManager.BATTERY_HEALTH_GOOD){
strHealth = "Good";
} else if (health == BatteryManager.BATTERY_HEALTH_OVERHEAT){
strHealth = "Over Heat";
} else if (health == BatteryManager.BATTERY_HEALTH_DEAD){
strHealth = "Dead";
} else if (health == BatteryManager.BATTERY_HEALTH_OVER_VOLTAGE){
strHealth = "Over Voltage";
} else if (health == BatteryManager.BATTERY_HEALTH_UNSPECIFIED_FAILURE){
strHealth = "Unspecified Failure";
} else{
strHealth = "Unknown";
}
batteryHealth.setText("Health: " + strHealth);
}
}
};
}
也许是一个每x秒执行一次的计时器(timertask)?还是我误解了这个问题?@Keyser我刚刚发现了同样的问题。更改上下文。取消注册接收者(此);但我不知道怎么做!afaik一些android设备只有在电池以10的倍数变化时才会发送广播。(即100%->90%->80%等)。不管怎样,您在哪里创建此batteryLevel()?活动?服务?嗨,哈维,我更新了上面的完整代码。你现在能检查一下这个吗。它仍然不起作用!您的代码底部可能有MbatteryLevelReceiver而不是BatteryLevelReceiver?但它仍然不起作用!7个月前发布了另一个相同的问题,以更改上下文;但我不知道怎么做!对不起,我没看到!!删除此行
context.unregisterReceiver(此)代码>并重试。