我正在使用widget开发一个应用程序。当我第一次点击widget时它会起作用（开始一项活动），但是在关闭和打开屏幕后它不会启动activity。以下是我的小部件的代码：
WidgetProvider
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
EmailApp.getAppComponent().inject(this);
for (int appWidgetId : appWidgetIds) {
updateAppWidget(context, appWidgetManager, appWidgetId);
//updateAppWidgetCompose(context, appWidgetManager, appWidgetId);
}
final AlarmManager manager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
final Intent i = new Intent(context, WidgetIntentService.class);
if (service == null) {
service = PendingIntent.getService(context, 0, i, PendingIntent.FLAG_CANCEL_CURRENT);
}
manager.setRepeating(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime(), 120000, service);
super.onUpdate(context, appWidgetManager, appWidgetIds);
}
private void updateAppWidget(Context context, AppWidgetManager appWidgetManager,
int appWidgetId) {
Intent intent = null;
// Construct the RemoteViews object
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.sample_widget);
// Construct an Intent object includes web adresss.
if(mPrefs.getUsername() != "")
intent = new Intent(context, HomeActivity.class);
else
intent = new Intent(context, MainActivity.class);
// In widget we are not allowing to use intents as usually. We have to use PendingIntent instead of 'startActivity'
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent,
PendingIntent.FLAG_UPDATE_CURRENT);
// Here the basic operations the remote view can do.
views.setOnClickPendingIntent(R.id.mainWidgetLayout, pendingIntent);
//views.setTextViewText(R.id.widget_folder, context.getText(R.string.boite_reception_label));
// Instruct the widget manager to update the widget
appWidgetManager.updateAppWidget(appWidgetId, views);
}
sample_widget
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/mainWidgetLayout"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true"
android:layout_marginTop="@dimen/widget_margin_top"
android:layout_marginLeft="@dimen/widget_margin_left"
android:layout_marginRight="@dimen/widget_margin_right"
android:layout_marginBottom="@dimen/widget_margin_bottom">
<LinearLayout
android:id="@+id/widget_header"
android:layout_width="match_parent"
android:layout_height="48dp"
android:background="@color/colorPrimary"
style="@style/WidgetHeaderStartMargin">
<TextView
android:id="@+id/widget_folder"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_gravity="center_vertical"
android:freezesText="true"
android:text="@string/widget_title"
android:includeFontPadding="false"
style="@style/WidgetTitle"/>
</LinearLayout>
<LinearLayout
android:id="@+id/widget_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="15dp"
android:visibility="gone"
android:background="@drawable/gradient_bg_widget_holo"
android:gravity="center_vertical">
<ImageView
android:id="@+id/numberImg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
app:srcCompat="@drawable/apk"/>
<TextView
android:id="@+id/textMsg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@android:color/black"
android:textStyle="bold"
android:text="@string/no_new_message" />
</LinearLayout>
<LinearLayout
android:id="@+id/widget_not_connected"
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="1"
android:orientation="vertical"
android:padding="15dp"
android:visibility="gone"
android:background="@drawable/gradient_bg_widget_holo"
android:gravity="center_vertical|center_horizontal">
<ImageView
android:layout_width="50dp"
android:layout_height="50dp"
android:src="@drawable/icon_deconnected"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@android:color/black"
android:textStyle="bold"
android:text="@string/device_not_connected" />
</LinearLayout>
<TextView
android:id="@+id/no_msg"
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="1"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textStyle="bold"
android:gravity="center"
android:textColor="@android:color/black"
android:background="@drawable/gradient_bg_widget_holo"
android:text="@string/no_new_message"/>
AndroidManifest
<receiver android:name=".widget.MailWidgetProvider">
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
</intent-filter>
<meta-data
android:name="android.appwidget.provider"
android:resource="@xml/widget_provider" />
</receiver>
我想了解代码中的错误或我需要在代码中添加的内容。欢迎提供各种帮助。
修改
我在AlarmManager中调用IntentService来获取更新小部件的数据。这是我的IntentService的内容
public class WidgetIntentService extends IntentService {
private String user, pass;
@Inject
PreferenceManager mPrefs;
public WidgetIntentService() {
super(WidgetIntentService.class.getName());
}
@Override
protected void onHandleIntent(@Nullable Intent intent) {
int count = 0;
user = mPrefs.getUsername();
pass = mPrefs.getPassword();
if(InternetStateMonitor.isConnected()) {
RemoteViews remoteViews = new RemoteViews(getPackageName(), R.layout.sample_widget);
remoteViews.setViewVisibility(R.id.widget_not_connected, View.GONE);
if(user!="" && pass!="") {
try {
count = server.getCount(user, pass);
Log.w("COUNT WIDGET",""+count);
} catch (Exception e) {
e.printStackTrace();
}
TextDrawable mDrawable = TextDrawable.builder()
.buildRound(""+count, Color.RED);
if(count == 0) {
remoteViews.setViewVisibility(R.id.widget_layout, View.GONE);
remoteViews.setViewVisibility(R.id.no_msg, View.VISIBLE);
//remoteViews.setTextViewText(R.id.no_msg, this.getText(R.string.no_new_message));
} else if(count == 1) {
remoteViews.setViewVisibility(R.id.no_msg, View.GONE);
remoteViews.setViewVisibility(R.id.widget_layout, View.VISIBLE);
remoteViews.setImageViewBitmap(R.id.numberImg, DrawableUtils.drawableToBitmap(mDrawable));
remoteViews.setTextViewText(R.id.textMsg, this.getText(R.string.new_message_single));
} else {
remoteViews.setViewVisibility(R.id.no_msg, View.GONE);
remoteViews.setViewVisibility(R.id.widget_layout, View.VISIBLE);
remoteViews.setImageViewBitmap(R.id.numberImg, DrawableUtils.drawableToBitmap(mDrawable));
remoteViews.setTextViewText(R.id.textMsg, this.getText(R.string.new_message_more));
}
ComponentName theWidget = new ComponentName(this, MailWidgetProvider.class);
AppWidgetManager manager = AppWidgetManager.getInstance(this);
manager.updateAppWidget(theWidget, remoteViews);
} else {
remoteViews.setViewVisibility(R.id.no_msg, View.VISIBLE);
remoteViews.setTextViewText(R.id.no_msg, this.getText(R.string.tap_here));
ComponentName theWidget = new ComponentName(this, MailWidgetProvider.class);
AppWidgetManager manager = AppWidgetManager.getInstance(this);
manager.updateAppWidget(theWidget, remoteViews);
}
} else {
RemoteViews remoteViews = new RemoteViews(getPackageName(), R.layout.sample_widget);
remoteViews.setViewVisibility(R.id.widget_layout, View.GONE);
remoteViews.setViewVisibility(R.id.no_msg, View.GONE);
remoteViews.setViewVisibility(R.id.widget_not_connected, View.VISIBLE);
ComponentName theWidget = new ComponentName(this, MailWidgetProvider.class);
AppWidgetManager manager = AppWidgetManager.getInstance(this);
manager.updateAppWidget(theWidget, remoteViews);
}
}
}
此代码是否在widget中更改了某些内容？
答案 0 :(得分：0)
您可以使用AppWidgetProvider的接收方法来启动您的活动。在每次单击操作时，您必须简单地广播一个操作消息，接收器将处理其余部分。 下面，我正在分享我用来解决类似问题的片段，
为广播操作声明一个常量String，在我的例子中，我使用add broadcast来启动一个活动。
public static final String ACTION_ADD = "com.myapplication.action.ADD";
在“updateAppWidget”方法中，使用此方法获取待定意图：
views.setOnClickPendingIntent(R.id.mainWidgetLayout, getPendingSelfIntent(context, ACTION_ADD, appWidgetId));
这是辅助方法：
private static PendingIntent getPendingSelfIntent(Context context, String action, int widgetId) {
Intent intent = new Intent(context, MailWidgetProvider.class);
intent.setAction(action);
intent.putExtra("widget_id", widgetId);
return PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
}
这就是你的AppWidgetProvider接收器的样子：
@Override
public void onReceive(Context context, Intent intent) {
if (ACTION_ADD.equals(intent.getAction())) {
int appWidgetId = intent.getIntExtra("widget_id", 0);
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
String content = preferences.getString(String.valueOf(appWidgetId),"0");
Intent expenseIntent;
if(preferences.getUsername() != "") {
expenseIntent = new Intent(context, HomeActivity.class);
}
else {
expenseIntent = new Intent(context, MainActivity.class);
}
expenseIntent.putExtra("widget_data", content);
expenseIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(expenseIntent);
} else {
super.onReceive(context, intent);
}
}