Android Widget桌面组件创建

package com.king.android.speical;

import com.king.android.R;

import android.appwidget.AppWidgetManager;

import android.appwidget.AppWidgetProvider;

import android.content.ComponentName;

import android.content.Context;

import android.content.pm.PackageManager;

import android.widget.RemoteViews;

/**

 * 描述：创建widget类

 * 作者：Andy.Liu

 * 时间： 2012-7-17  上午07:01:39

 **/

public class ExampleAppWidgetProvider extends AppWidgetProvider {

@Override

public void onUpdate(Context context, AppWidgetManager appWidgetManager,int[] appWidgetIds) {

final int N = appWidgetIds.length;

for(int i=0;i<N;i++){

int appWidgetId = appWidgetIds[i];

String titlePrefix = WidgetActivity.loadTitlePref(context, appWidgetId);

updateAppWidget(context, appWidgetManager, appWidgetId, titlePrefix);

}

super.onUpdate(context, appWidgetManager, appWidgetIds);

}

//当桌面组件删除时调用 

@Override

public void onDeleted(Context context, int[] appWidgetIds) {

//删除appWidget

final int N = appWidgetIds.length;

for(int i =0;i<N;i++){

WidgetActivity.deleteTitlePref(context, appWidgetIds[i]);

}

}

//当AppWidtgetProvider提供的第一个组件删除时调用

@Override

public void onEnabled(Context context) {

PackageManager pm = context.getPackageManager();

pm.setComponentEnabledSetting(new ComponentName("com.king.android.special", ".ExampleBroadCastReceiver"), PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);

}

//当AppWidtgetProvider提供的最后一个组件删除时调用

@Override

public void onDisabled(Context context) {

PackageManager pm = context.getPackageManager();

pm.setComponentEnabledSetting(new ComponentName("com.king.android.special", ".ExampleBroadCastReceiver"), PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);

}

// 更新

static void updateAppWidget(Context context,AppWidgetManager appwidgetManager,int appWidgetId,String titlePrefix){

//构建 RemoteViews 对象对桌面组件进行更新

RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.appwidget_provider);

//更新文本内容，指定布局组件

views.setTextViewText(R.id.appwidget_text, titlePrefix);

//将RemoteViews更新传入到AppWidget进行更新

appwidgetManager.updateAppWidget(appWidgetId, views);

}

}

package com.king.android.speical;

import java.util.ArrayList;

import android.appwidget.AppWidgetManager;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

/**

 * 描述：创建广播类来接收的信息

 * 作者：Andy.Liu

 * 时间： 2012-7-17  上午07:03:30

 **/

public class ExampleBroadcastReceiver extends BroadcastReceiver {

@Override

public void onReceive(Context context, Intent intent) {

//通过BroadCastReceiver来更新AppWidget

String action = intent.getAction();

if(action.equals(Intent.ACTION_TIMEZONE_CHANGED)||action.equals(Intent.ACTION_TIME_CHANGED)){

AppWidgetManager gm = AppWidgetManager.getInstance(context);

ArrayList<Integer> appWidgetIds = new ArrayList<Integer>();

ArrayList<String> texts = new ArrayList<String>();

WidgetActivity.loadAllTitlePrefs(context, appWidgetIds, texts);

// 更新所有AppWidget

final int N = appWidgetIds.size();

for(int i=0;i<N;i++){

ExampleAppWidgetProvider.updateAppWidget(context,gm,appWidgetIds.get(i),texts.get(i));

}

}

}

}

 package com.king.android.speical;

import java.util.ArrayList;

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.view.View;

import android.widget.EditText;

import com.king.android.R;

public class WidgetActivity extends Activity

{

private static final String PREFS_NAME = "com.king.android.ExampleAppWidgetProvider";

private static final String PREF_PREFIX_KEY = "prefix_";

int mAppWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;

EditText mAppWidgetPrefix;

public WidgetActivity()

{

super();

}

public void onCreate(Bundle icicle)

{

super.onCreate(icicle);

setResult(RESULT_CANCELED);

setContentView(R.layout.appwidget_configure);

mAppWidgetPrefix = (EditText) findViewById(R.id.appwidget_prefix);

findViewById(R.id.save_button).setOnClickListener(mOnClickListener);

Intent intent = getIntent();

Bundle extras = intent.getExtras();

if (extras != null)

{

mAppWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);

}

if (mAppWidgetId == AppWidgetManager.INVALID_APPWIDGET_ID)

{

finish();

}

mAppWidgetPrefix.setText(loadTitlePref(WidgetActivity.this, mAppWidgetId));

}

View.OnClickListener mOnClickListener = new View.OnClickListener() 

{

public void onClick(View v)

{

final Context context = WidgetActivity.this;

String titlePrefix = mAppWidgetPrefix.getText().toString();

saveTitlePref(context, mAppWidgetId, titlePrefix);

//取得AppWidgetManager实例

AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);

//更新AppWidget

ExampleAppWidgetProvider.updateAppWidget(context, appWidgetManager, mAppWidgetId, titlePrefix);

Intent resultValue = new Intent();

resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mAppWidgetId);

setResult(RESULT_OK, resultValue);

finish();

}

};

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();

}

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 "xxxxxxxxxxxxxxxxx";

}

}

static void deleteTitlePref(Context context, int appWidgetId)

{

}

static void loadAllTitlePrefs(Context context, ArrayList<Integer> appWidgetIds, ArrayList<String> texts)

{

}

}

 <?xml version="1.0" encoding="utf-8"?>

<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"

    />

    <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>

 <?xml version="1.0" encoding="utf-8"?>

<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"

    android:minWidth="100dp"

    android:minHeight="50dp"

    android:updatePeriodMillis="86400000"

    android:initialLayout="@layout/appwidget_provider"/>

 <?xml version="1.0" encoding="utf-8"?>

<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"/>