java – 如何设置始终显示的警报？
作者：互联网
现在,我只想在用户访问应用程序时获得某种电池状态指示.例如,如果设备已插入,则设备应该说充电和它的电平.如果设备已拔下,则不应显示任何内容.如果设备未充电且电池电量不足,则应显示电池电量不足指示.
我设置了大部分代码,但问题是,例如,如果我运行应用程序并且设备已插入,屏幕上会显示充电指示.如果我拔下设备,则不再显示充电但如果我重新插入设备,则仍然无法再显示充电.当设备插入或拔出,电池电量不足或电量不足时,应始终显示电池警报.应始终显示信息更改.
所以这是我的广播接收器：
private BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context arg0, Intent intent) {
//Battery level
int level = intent.getIntExtra("level", 0);
//Plugged in Status
int plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
//Battery Status
int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
//If the device is charging or contains a full status, it's charging
boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||
status == BatteryManager.BATTERY_STATUS_FULL;
//If the device isCharging and plugged in, then show that the battery is charging
TextView batteryTextView = ((TextView) findViewById(R.id.charging));
TextView batteryLowTextView = ((TextView) findViewById(R.id.low_battery));
ImageView batteryLowImageView= ((ImageView) findViewById(R.id.low_battery_icon));
ImageView batteryImageView =((ImageView) findViewById(R.id.charging_battery_icon));
if (isCharging && plugged == BatteryManager.BATTERY_PLUGGED_AC || plugged == BatteryManager.BATTERY_PLUGGED_USB) {
//Gets the 'last synced' string and sets to datetime of the last sync
Resources resources = context.getResources();
String chargingString = String.format(resources.getString(R.string.charging), level);
//Dynamically sets the value of the battery level
batteryLowTextView.setVisibility(TextView.INVISIBLE);
batteryLowImageView.setVisibility(ImageView.INVISIBLE);
batteryTextView.setText(chargingString + "%");
} else if (level < LOW_BATTERY_LEVEL && !isCharging) {
Resources resources = context.getResources();
String lowBatteryString = String.format(resources.getString(R.string.low_battery));
batteryTextView.setVisibility(TextView.INVISIBLE);
batteryImageView.setVisibility(ImageView.INVISIBLE);
batteryLowTextView.setText(lowBatteryString);
} else if (!isCharging && level > LOW_BATTERY_LEVEL) {
//do nothing
batteryTextView.setVisibility(TextView.GONE);
batteryImageView.setVisibility(ImageView.GONE);
}
}
};
在我的OnCreate方法中,我打电话
//calls registerReceiver to receive the broadcast for the state of battery
this.registerReceiver(this.mBatInfoReceiver,new
IntentFilter(Intent.ACTION_BATTERY_CHANGED));
所以,我想知道我做错了什么？是bools吗？
解决方法:
>你的if-then-else逻辑有很多漏洞(并且有@Vikram提到的问题).这可能导致接收器最终无所事事.尝试简化逻辑以删除所有漏洞.
>更新文本视图时,还必须记住首先使其(及其图像视图)可见.
这是if-then-else逻辑的替代品：
if (isCharging) {
//Gets the 'last synced' string and sets to datetime of the last sync
Resources resources = context.getResources();
String chargingString = String.format(resources.getString(R.string.charging), level);
//Dynamically sets the value of the battery level
batteryLowTextView.setVisibility(TextView.INVISIBLE);
batteryLowImageView.setVisibility(ImageView.INVISIBLE);
batteryTextView.setText(chargingString + "%");
batteryTextView.setVisibility(TextView.VISIBLE);
batteryImageView.setVisibility(ImageView.VISIBLE);
} else if (level <= LOW_BATTERY_LEVEL) {
Resources resources = context.getResources();
String lowBatteryString = String.format(resources.getString(R.string.low_battery));
batteryTextView.setVisibility(TextView.INVISIBLE);
batteryImageView.setVisibility(ImageView.INVISIBLE);
batteryLowTextView.setText(lowBatteryString);
batteryLowTextView.setVisibility(TextView.VISIBLE);
batteryLowImageView.setVisibility(ImageView.VISIBLE);
} else {
//show nothing
batteryTextView.setVisibility(TextView.GONE);
batteryImageView.setVisibility(ImageView.GONE);
batteryLowTextView.setVisibility(TextView.GONE);
batteryLowImageView.setVisibility(ImageView.GONE);
}
标签：android,batterymanager,java,broadcastreceiver,alerts 来源： https://codeday.me/bug/20190728/1561131.html