我正在尝试显示以下状态:
电池电量(t / f) USB收费(t / f) 电池交流电(t / f) 电池电量(百分比)
在扩展控件中更改充电器连接后。
在onResume()中,广播接收器状态
无法解析方法 'registerReceiver(android.content.BroadcastReceiver)
它在onPause()中注册没有问题。 感谢您的帮助,这似乎是一个很难解决的问题。
MainActivity:
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.BatteryManager;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
BroadcastReceiver broadcastReceiver;
StringBuilder stringBuilder;
public MyReciever myReciever= new MyReciever();
Intent intent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
broadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
myReciever.onReceive(MainActivity.this, intent);
StringBuilder stringBuilder = new StringBuilder();
IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
intent = registerReceiver(null, ifilter);
int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||status == BatteryManager.BATTERY_STATUS_FULL;
int chargePlug = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;
int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
float batteryPct = level / (float)scale;
stringBuilder.append(String.valueOf(isCharging));
stringBuilder.append(String.valueOf(usbCharge));
stringBuilder.append(String.valueOf(acCharge));
stringBuilder.append(String.valueOf(batteryPct));
String str = stringBuilder.toString();
TextView display = (TextView)findViewById(R.id.results);
display.setText(str);
}
};
}
///Not Registering here
@Override
protected void onResume() {
super.onResume();
registerReceiver(broadcastReceiver);
}
@Override
protected void onPause() {
super.onPause();
unregisterReceiver(broadcastReceiver);
}
}
MyReceiver:
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
public class MyReciever extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Intent newintent = new Intent(context.getApplicationContext(), MainActivity.class);
newintent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(newintent);
}
}
activity_main.XML:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
android:id="@+id/results"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
答案 0 :(得分:0)
您的问题是方法registerReciever
接受2个参数,而不是1。
这些参数是
由于您仅提供第一个参数,因此找不到该方法,并且因为没有版本的方法(重载方法)仅采用一个参数。
因此,要解决此问题,您必须调用如下方法:
protected void onResume() {
registerReceiver(broadcastReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
super.onResume();
}
此处https://developer.android.com/reference/android/content/IntentFilter.html
提供了创建IntentFilter的文档。答案 1 :(得分:0)
尝试
@Override
protected void onResume() {
registerReceiver(broadcastReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
super.onResume();
}
有关更多信息,请参阅https://developer.android.com/training/monitoring-device-state/battery-monitoring.html