我在 github https://github.com/onlinux/AndroidBatteryWidget中发现了这个电池小部件。我想创建与应用程序中相同的图表。问题是这是一个小部件，事情有点不同。该小部件有一个带有服务类的类https://github.com/onlinux/AndroidBatteryWidget/blob/master/src/fr/free/onlinux/AndroidBatteryWidget/AndroidBatteryWidgetProvider.javaUpdateService。认为我不需要小部件提供程序，我只使用服务并创建了一个新类，UpdateService.java如下所示：
package com.mypackage.app;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
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.IBinder;
import android.util.Log;
import android.widget.RemoteViews;
import android.app.PendingIntent;
import android.app.Service;
public static class UpdateService extends Service {
public final static String TAG = "Bat";
//private static final String TAG = AndroidBatteryWidgetProvider.class.getSimpleName();
public static Boolean debug = true;
BatteryInfo mBI = null;
public void updateWidget(Context context, Intent batteryIntent){
if (debug) Log.i(TAG,"---------- updateWidget");
SimpleDateFormat formatter = new SimpleDateFormat(" HH:mm:ss ");
RemoteViews updateViews = new RemoteViews(context.getPackageName(), R.layout.androidbatterywidget_layout);
updateViews.setTextViewText(R.id.level, "waiting!");
final int status = batteryIntent.getIntExtra("status", BatteryManager.BATTERY_STATUS_UNKNOWN);
final int plugged = batteryIntent.getIntExtra(BatteryManager.EXTRA_PLUGGED, 0);
final int level = batteryIntent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
updateViews.setTextViewText(R.id.level, "" + level + " %" );
updateViews.setTextViewText(R.id.time, formatter.format(new Date()));
final int temperature = batteryIntent.getIntExtra(BatteryManager.EXTRA_TEMPERATURE, -1);
String tempString= String.format("%.0f°C", new Float(temperature/10));
if (debug) Log.d(TAG,"BAT:" + tempString + " " + level + "%");
updateViews.setTextViewText(R.id.temperature, tempString );
final int voltage = batteryIntent.getIntExtra(BatteryManager.EXTRA_VOLTAGE, -1);
Intent i = new Intent(context, AndroidBatteryActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);
/* updateViews.setTextViewText(R.id.voltage, "" + voltage + " mV" );
updateViews.setOnClickPendingIntent(R.id.layout ,
PendingIntent.getActivity(context, 0,
new Intent(context, AndroidBatteryActivity.class),Intent.FLAG_ACTIVITY_NEW_TASK));
ComponentName myComponentName = new ComponentName(context, AndroidBatteryWidgetProvider.class);
AppWidgetManager manager = AppWidgetManager.getInstance(context);
manager.updateAppWidget(myComponentName, updateViews); */
//Second, update database in a thread
new Thread (new Runnable(){
public void run(){
final Context c=getApplicationContext();
DBHelper db = new DBHelper(c);
db.record( level, status, plugged );
db.deleteOldEntries();
db.close();
if (debug) Log.i( TAG, "---------- Add record: " + level + " time: "+ Calendar.getInstance().getTimeInMillis() );
}
}).start();
}
public void handleCommand(Intent intent){
if(mBI == null)
{
mBI = new BatteryInfo(this);
// IntentFilter mIntentFilter = new IntentFilter();
// mIntentFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
// registerReceiver(mBI, mIntentFilter);
// After registering mBI, another update is immediately processed.
// So, skip double update processing.
return;
}
//update widget views and database
updateWidget(getApplicationContext(), intent);
}
@Override
public void onStart(Intent intent, int startId) {
handleCommand(intent);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
if (debug)
Log.d(TAG, "----------------- onStartCommand");
handleCommand(intent);
// The service has to be running otherwise the broadcast ACTION_BATTERY_CHANGED wont be received anymore
// thats why it returns START_STICKY
return START_STICKY;
}
@Override
public void onDestroy() {
super.onDestroy();
try{
if(mBI != null) {
if (debug)
Log.d(TAG, "----------------- onDestroy: unregisterReceiver(mBI)" );
unregisterReceiver(mBI);
}
}catch(Exception e)
{Log.e(TAG, "", e);}
}
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
}
}
在我的 MainActivity 中，如果单击 go to graph，我创建了一个按钮，所以 onclick
Intent intent = new Intent(context, UpdateService.class);
context.startService(intent);
现在，发生的事情是我可以从 logCat 接收器中看到并且服务运行良好。但是单击应用程序中的按钮没有任何反应。应用程序退出并且没有任何活动开始。在我写的清单中
<service android:name=".UpdateService" />
<receiver android:name=".BatteryInfo" android:label="BatteryInfo">
<intent-filter>
<action android:name="android.intent.action.BATTERY_CHANGED" />
</intent-filter>
</receiver>
<activity
android:name=".AndroidBatteryActivity"
android:label="@string/app_name" >
</activity>
<activity android:name="org.achartengine.GraphicalActivity" >
</activity>
编辑：我尝试编辑一点代码，现在添加这部分
Intent i = new Intent(context, AndroidBatteryActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);
启动 Activity AndroidBatteryActivity 但全黑，什么也没有出现。如果 AndroidBatteryActivity 是这个：
public class AndroidBatteryActivity extends Activity {
public Intent intent ;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
intent = new BatteryChart().execute(this);
startActivity(intent);
finish();
}
public void myfinish(){
Log.i("AndroidBatteryActivity", "finish");
finish();
}
}
BatteryChart 是带有 chartengine 的图形类。. 我如何调整我的代码？我怎样才能开始图表？我必须改变什么？谢谢