API DEMO APPWIGHT 学习
1: APP WIGHT的 AppWidget Provider 配置文件 appwight_provider.xml新建xml文件->类型：AppWidget Provider->文件会新建在res/xml下
它包含了Widget在桌面的大小（74*单元格-2），
单位dip,Widget自动更新的周期（android:updatePeriodMillis）此方法1.5以后已经失效，默认30分钟更新一次，如要自定义可以通过service在定时器中实现，添加Widget时假如要先进入一个界面进行配置，
这个就指定了配置Activity是谁（android:configure="com.example.android.apis.appwidget.ExampleAppWidgetConfigure"）；
该文件是在Receiver的resource属性里被指定的。
initiaLayout指定界面布局文件
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android" android:minWidth="60dp" android:minHeight="30dp" android:updatePeriodMillis="86400000" android:initialLayout="@layout/appwidget_provider" android:configure="com.example.android.apis.appwidget.ExampleAppWidgetConfigure" ></appwidget-provider>
<receiver android:name=".appwidget.ExampleAppWidgetProvider"> <meta-data android:name="android.appwidget.provider" android:resource="@xml/appwidget_provider" /> <intent-filter> <action android:name="android.appwidget.action.APPWIDGET_UPDATE" /> </intent-filter> </receiver>
2： APP WIGHT的界面布局 appwidgt_provider res/layout/
<TextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/appwidget_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="#ff000000"/>
3: app widht 核心处理代码
/* * Copyright (C) 2008 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package com.example.android.apis.appwidget;import android.appwidget.AppWidgetManager;import android.appwidget.AppWidgetProvider;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.content.pm.PackageManager;import android.os.SystemClock;import android.util.Log;import android.widget.RemoteViews;import java.util.ArrayList;// Need the following import to get access to the app resources, since this// class is in a sub-package.import com.example.android.apis.R;/** * A widget provider.We have a string that we pull from a preference in order to show * the configuration settings and the current time when the widget was updated.We also * register a BroadcastReceiver for time-changed and timezone-changed broadcasts, and * update then too. * * <p>See also the following files: * <ul> * <li>ExampleAppWidgetConfigure.java</li> * <li>ExampleBroadcastReceiver.java</li> * <li>res/layout/appwidget_configure.xml</li> * <li>res/layout/appwidget_provider.xml</li> * <li>res/xml/appwidget_provider.xml</li> * </ul> */public class ExampleAppWidgetProvider extends AppWidgetProvider { // log tag private static final String TAG = "ExampleAppWidgetProvider"; public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) { Log.d(TAG, "onUpdate"); // For each widget that needs an update, get the text that we should display: // - Create a RemoteViews object for it // - Set the text in the RemoteViews object // - Tell the AppWidgetManager to show that views object for the widget. final int N = appWidgetIds.length; for (int i=0; i<N; i++) { int appWidgetId = appWidgetIds; String titlePrefix = ExampleAppWidgetConfigure.loadTitlePref(context, appWidgetId); updateAppWidget(context, appWidgetManager, appWidgetId, titlePrefix); } } public void onDeleted(Context context, int[] appWidgetIds) { Log.d(TAG, "onDeleted"); // When the user deletes the widget, delete the preference associated with it. final int N = appWidgetIds.length; for (int i=0; i<N; i++) { ExampleAppWidgetConfigure.deleteTitlePref(context, appWidgetIds); } } public void onEnabled(Context context) { Log.d(TAG, "onEnabled"); // When the first widget is created, register for the TIMEZONE_CHANGED and TIME_CHANGED // broadcasts.We don't want to be listening for these if nobody has our widget active. // This setting is sticky across reboots, but that doesn't matter, because this will // be called after boot if there is a widget instance for this provider. PackageManager pm = context.getPackageManager(); pm.setComponentEnabledSetting( new ComponentName("com.example.android.apis", ".appwidget.ExampleBroadcastReceiver"), PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP); } public void onDisabled(Context context) { // When the first widget is created, stop listening for the TIMEZONE_CHANGED and // TIME_CHANGED broadcasts. Log.d(TAG, "onDisabled"); Class clazz = ExampleBroadcastReceiver.class; PackageManager pm = context.getPackageManager(); pm.setComponentEnabledSetting( new ComponentName("com.example.android.apis", ".appwidget.ExampleBroadcastReceiver"), PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP); } static void updateAppWidget(Context context, AppWidgetManager appWidgetManager, int appWidgetId, String titlePrefix) { Log.d(TAG, "updateAppWidget appWidgetId=" + appWidgetId + " titlePrefix=" + titlePrefix); // Getting the string this way allows the string to be localized.The format // string is filled in using java.util.Formatter-style format strings. CharSequence text = context.getString(R.string.appwidget_text_format, ExampleAppWidgetConfigure.loadTitlePref(context, appWidgetId), "0x" + Long.toHexString(SystemClock.elapsedRealtime())); // Construct the RemoteViews object.It takes the package name (in our case, it's our // package, but it needs this because on the other side it's the widget host inflating // the layout from our package). RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.appwidget_provider); views.setTextViewText(R.id.appwidget_text, text); // Tell the widget manager appWidgetManager.updateAppWidget(appWidgetId, views); }}
4 app widht 配置Activity处理代码
/* * Copyright (C) 2008 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package com.example.android.apis.appwidget;import android.app.Activity;import android.appwidget.AppWidgetManager;import android.content.Context;import android.content.Intent;import android.content.SharedPreferences;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.EditText;import java.util.ArrayList;// Need the following import to get access to the app resources, since this// class is in a sub-package.import com.example.android.apis.R;/** * The configuration screen for the ExampleAppWidgetProvider widget sample. */public class ExampleAppWidgetConfigure extends Activity { static final String TAG = "ExampleAppWidgetConfigure"; private static final String PREFS_NAME = "com.example.android.apis.appwidget.ExampleAppWidgetProvider"; private static final String PREF_PREFIX_KEY = "prefix_"; int mAppWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID; EditText mAppWidgetPrefix; public ExampleAppWidgetConfigure() { super(); } @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); // Set the result to CANCELED.This will cause the widget host to cancel // out of the widget placement if they press the back button. setResult(RESULT_CANCELED); // Set the view layout resource to use. setContentView(R.layout.appwidget_configure); // Find the EditText mAppWidgetPrefix = (EditText)findViewById(R.id.appwidget_prefix); // Bind the action for the save button. findViewById(R.id.save_button).setOnClickListener(mOnClickListener); // Find the widget id from the intent. Intent intent = getIntent(); Bundle extras = intent.getExtras(); if (extras != null) { mAppWidgetId = extras.getInt( AppWidgetManager.EXTRA_APPWIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID); } // If they gave us an intent without the widget id, just bail. if (mAppWidgetId == AppWidgetManager.INVALID_APPWIDGET_ID) { finish(); } mAppWidgetPrefix.setText(loadTitlePref(ExampleAppWidgetConfigure.this, mAppWidgetId)); } View.OnClickListener mOnClickListener = new View.OnClickListener() { public void onClick(View v) { final Context context = ExampleAppWidgetConfigure.this; // When the button is clicked, save the string in our prefs and return that they // clicked OK. String titlePrefix = mAppWidgetPrefix.getText().toString(); saveTitlePref(context, mAppWidgetId, titlePrefix); // Push widget update to surface with newly set prefix AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context); ExampleAppWidgetProvider.updateAppWidget(context, appWidgetManager, mAppWidgetId, titlePrefix); // Make sure we pass back the original appWidgetId Intent resultValue = new Intent(); resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mAppWidgetId); setResult(RESULT_OK, resultValue); finish(); } }; // Write the prefix to the SharedPreferences object for this widget static void saveTitlePref(Context context, int appWidgetId, String text) { SharedPreferences.Editor prefs = context.getSharedPreferences(PREFS_NAME, 0).edit(); prefs.putString(PREF_PREFIX_KEY + appWidgetId, text); prefs.commit(); } // Read the prefix from the SharedPreferences object for this widget. // If there is no preference saved, get the default from a resource static String loadTitlePref(Context context, int appWidgetId) { SharedPreferences prefs = context.getSharedPreferences(PREFS_NAME, 0); String prefix = prefs.getString(PREF_PREFIX_KEY + appWidgetId, null); if (prefix != null) { return prefix; } else { return context.getString(R.string.appwidget_prefix_default); } } static void deleteTitlePref(Context context, int appWidgetId) { } static void loadAllTitlePrefs(Context context, ArrayList<Integer> appWidgetIds, ArrayList<String> texts) { }}
配置文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/appwidget_configure_instructions" /> <EditText android:id="@+id/appwidget_prefix" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <Button android:id="@+id/save_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@android:string/ok" /></LinearLayout>
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