我正在寻找一个可以检查电池状态的AppWidget(电平,充电/不充电)。
我写了很多代码行,但是,即使它完美运行,我也看到将它放在屏幕上使电话变慢,有时会崩溃。
我认为这是因为我做错了。有人能帮我吗?感谢的
这里我的清单:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="it.bisneff.widgetone"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="10" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<receiver android:name="MyWidgetProvider" >
<intent-filter >
<action
android:name="android.appwidget.action.APPWIDGET_UPDATE" />
<action android:name="android.intent.action.ACTION_POWER_CONNECTED"/>
<action android:name="android.intent.action.ACTION_POWER_DISCONNECTED"/>
</intent-filter>
<meta-data
android:name="android.appwidget.provider"
android:resource="@xml/widget_info" />
</receiver>
</application>
</manifest>
这是我的主要课程:
package it.bisneff.widgetone;
import it.bisneff.widgetone.R;
import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.BatteryManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.RemoteViews;
public class MyWidgetProvider extends AppWidgetProvider {
//Unused String
private static final String ACTION_CLICK = "ACTION_CLICK";
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
ComponentName thisWidget = new ComponentName(context,
MyWidgetProvider.class);
int[] allWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);
for (int widgetId : allWidgetIds) {
Intent batteryStatus =context.getApplicationContext().registerReceiver(this,
new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
//Battery Level
int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
//Max Battery Level
int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
// %
float batteryPct = level / (float)scale;
batteryPct=batteryPct*100;
RemoteViews remoteViews = new RemoteViews(context.getPackageName(),
R.layout.widget_layout);
//Charging or not
int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
boolean isCharging = status == BatteryManager.BATTERY_STATUS_CHARGING ||
status == BatteryManager.BATTERY_STATUS_FULL;
//integer convertion
int batteryPctz=(int)batteryPct;
Log.w("WidgetExample", String.valueOf(batteryPctz)+"%");
//USB or AC charge
int chargePlug = batteryStatus.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
boolean usbCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_USB;
boolean acCharge = chargePlug == BatteryManager.BATTERY_PLUGGED_AC;
//update view
remoteViews.setTextViewText(R.id.update, String.valueOf(batteryPctz)+"%");
//select the image for the battery level
String res=new String();
res="it.bisneff.widgetone:drawable/battery";
if (batteryPct >= 90)
{ res+="6";
}
if (batteryPct >= 75 && batteryPct < 90)
{
res+="5";
}
if (batteryPct >= 60 && batteryPct < 75 )
{
res+="4";
}
if (batteryPct >= 35 && batteryPct < 60 )
{
res+="3";
}
if (batteryPct >= 15 && batteryPct < 35 )
{
res+="2";
}
if (batteryPct < 15 )
{
res+="1";
}
if(isCharging){
if(acCharge)
{
res+="cha";
}
if(usbCharge)
{
res+="usb";
}
if (batteryPctz==100){res="it.bisneff.widgetone:drawable/battery6full";}
}
//check the resource
int reso= context.getResources().getIdentifier(res, null, null);
//put the right image
remoteViews.setImageViewResource(R.id.imageView1, reso);
//Set Click Listener
Intent intent = new Intent(context, MyWidgetProvider.class);
intent.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, appWidgetIds);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context,
0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
remoteViews.setOnClickPendingIntent(R.id.update, pendingIntent);
appWidgetManager.updateAppWidget(widgetId, remoteViews);
}
}
@Override
public void onReceive(Context context, Intent intent) {
super.onReceive(context, intent);
//check received intent action
if( ((intent.getAction()).equals(Intent.ACTION_BATTERY_CHANGED)) || ((intent.getAction()).equals(Intent.ACTION_POWER_CONNECTED)) || ((intent.getAction()).equals(Intent.ACTION_POWER_DISCONNECTED))){
//get Bundle
Bundle extras = intent.getExtras();
//if extras
if(extras!=null) {
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
ComponentName thisAppWidget = new ComponentName(context.getPackageName(), MyWidgetProvider.class.getName());
int[] appWidgetIds = appWidgetManager.getAppWidgetIds(thisAppWidget);
//call the onUpdate
onUpdate(context, appWidgetManager, appWidgetIds);
}
}
}
}
编辑:
我知道问题在哪里。
如果我有
....
Intent batteryStatus =context.getApplicationContext().registerReceiver(this,
new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
context.getApplicationContext().unregisterReceiver(this);//this line
....
小部件停止循环。但它停止更新电池电量变化......
我添加了
@Override
public void onEnabled(Context context){
context.getApplicationContext().registerReceiver(this, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
}
要确保注册我的接收器,但它不起作用,我无法从XML注册它因为文档说不能在那里注册。
我该怎么办?
答案 0 :(得分:0)
你好Valerio Bisneff Ponza,
您必须面对此例外:
android.content.ReceiverCallNotAllowedException: BroadcastReceiver components are not allowed to register to receive intents
原因:这是因为,您(Widget / BroadCast接收器)无法从另一个Intent_Filter注册自己或从内部注册另一个接收器(Widget / BroadCast接收器)......
如果您在注册Widget时添加了清单:
...大部分时间你的Widget都不会响应。
原因:Widget与进程(pid)或服务相关联,如果独立运行(活动/服务)未运行,则不会接收Intents。
做什么呢?
在On Enabled中,启动服务,明确更新您的小部件,在onStart()服务中注册BroadCast接收器并从服务更新Widget。
注意:请记住在onStop()服务中取消注册接收者,否则会出现另一个异常......并从Widget的onDisabled()显式调用stopService()。如果需要,请在清单中将您的服务保持为exported =“false”,并在此处输入代码。
亲爱的Ponza,我有时会遇到这种情况,基于某些基于使用情况的GC,您的服务会被Android杀死。但在这种情况下,我们总是可以在Widget的每个操作中使用一些共享的Pref布尔值进行智能检查。
希望我的答案足够详细;)