在Android中获取电池电量和状态
如何获得电池电量和状态（插入，放电，充电等）？我研究了开发人员文档，然后找到了一个BatteryManager类。但它不包含任何方法，只包含常量。我怎么用呢？
没有找到相关结果
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樊熄忙暖
意图的广播接收器，因为它不能通过清单中声明的组件接收，只能通过用明确注册它。public class Main extends Activity { private TextView batteryTxt; private BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver(){ @Override public void onReceive(Context ctxt, Intent intent) { int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0); batteryTxt.setText(String.valueOf(level) + "%"); } }; @Override public void onCreate(Bundle b) { super.onCreate(b); setContentView(R.layout.main); batteryTxt = (TextView) this.findViewById(R.id.batteryTxt); this.registerReceiver(this.mBatInfoReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED)); } }抽法
抵浮细
public static int getBatteryPercentage(Context context) { IntentFilter iFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED); Intent batteryStatus = context.registerReceiver(null, iFilter); int level = batteryStatus != null ? batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1) : -1; int scale = batteryStatus != null ? batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1) : -1; float batteryPct = level / (float) scale; return (int) (batteryPct * 100); }蓟类
这来自https://developer.android.com/training/monitoring-device-state/battery-monitoring.html上的官方文档。撕吠
private void batteryLevel() { BroadcastReceiver batteryLevelReceiver = new BroadcastReceiver() { public void onReceive(Context context, Intent intent) { context.unregisterReceiver(this); int rawlevel = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1); int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1); int level = -1; if (rawlevel >= 0 && scale > 0) { level = (rawlevel * 100) / scale; } batterLevel.setText("Battery Level Remaining: " + level + "%"); } }; IntentFilter batteryLevelFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED); registerReceiver(batteryLevelReceiver, batteryLevelFilter); }恋裂
void getBattery_percentage() { IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED); Intent batteryStatus = getApplicationContext().registerReceiver(null, ifilter); int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1); int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1); float batteryPct = level / (float)scale; float p = batteryPct * 100; Log.d("Battery percentage",String.valueOf(Math.round(p))); }莽缓逢
纤洞需匪
private void batteryLevel() { BroadcastReceiver batteryLevelReceiver = new BroadcastReceiver() { public void onReceive(Context context, Intent intent) { context.unregisterReceiver(this); int rawlevel = intent.getIntExtra("level", -1); int scale = intent.getIntExtra("scale", -1); int level = -1; if (rawlevel >= 0 && scale > 0) { level = (rawlevel * 100) / scale; } mBtn.setText("Battery Level Remaining: " + level + "%"); } }; IntentFilter batteryLevelFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED); registerReceiver(batteryLevelReceiver, batteryLevelFilter); }疾桓
踩什不
public static float getBatteryLevel(Context context, Intent intent) { Intent batteryStatus = context.registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED)); int batteryLevel = -1; int batteryScale = 1; if (batteryStatus != null) { batteryLevel = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, batteryLevel); batteryScale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, batteryScale); } return batteryLevel / (float) batteryScale * 100; }