Android Widget 小部件(三) 在Activity中添加Widget

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 package com.jackie.ui;

 import static android.util.Log.d;
 import android.app.Activity;
 import android.appwidget.AppWidgetHost;
 import android.appwidget.AppWidgetManager;
 import android.appwidget.AppWidgetProviderInfo;
 import android.content.Intent;
 import android.os.Bundle;
 import android.view.View;
 import android.view.View.OnLongClickListener;
 import android.widget.FrameLayout;
 import android.widget.FrameLayout.LayoutParams;

 /**
  * 在activity中，长按，弹出widget选择界面，
  * 选择的widget有配置就先弹出，
  * 创建widget的view 将view加载到 activity中
  */
 public class AddWidgetActivity extends Activity {
     private AppWidgetHost mAppWidgetHost;
     private AppWidgetManager mAppWidgetManager;
     private FrameLayout frameLayout;
     private static final int REQUEST_PICK_APPWIDGET = 1;
     private static final int REQUEST_CREATE_APPWIDGET = 2;
     private static final int APPWIDGET_HOST_ID = 0x100;     //用于标识
     private static final String EXTRA_CUSTOM_WIDGET = "custom_widget";

     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         mAppWidgetManager = AppWidgetManager.getInstance(getApplicationContext());
         mAppWidgetHost = new AppWidgetHost(getApplicationContext(), APPWIDGET_HOST_ID);
         //开始监听widget的变化
         mAppWidgetHost.startListening();

         frameLayout = new FrameLayout(this);
         frameLayout.setOnLongClickListener(new OnLongClickListener() {

             @Override
             public boolean onLongClick(View v) {
                 showWidgetChooser();
                 return true;
             }
         });
         setContentView(frameLayout);
     }

     @Override
     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
         if (resultCode == RESULT_OK) {
             switch (requestCode) {
             case REQUEST_PICK_APPWIDGET:
                 addAppWidget(data);
                 break;
             case REQUEST_CREATE_APPWIDGET:
                 completeAddAppWidget(data);
                 break;
             }
         } else if (requestCode == REQUEST_PICK_APPWIDGET &&
                 resultCode == RESULT_CANCELED && data != null) {
             // Clean up the appWidgetId if we canceled
             int appWidgetId = data.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, -1);
             if (appWidgetId != -1) {
                 mAppWidgetHost.deleteAppWidgetId(appWidgetId);
             }
         }
     }

     /**
      * 选中了某个widget之后，根据是否有配置来决定直接添加还是弹出配置activity
      * @param data
      */
     private void addAppWidget(Intent data) {
         int appWidgetId = data.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, -1);

         String customWidget = data.getStringExtra(EXTRA_CUSTOM_WIDGET);
         d("addAppWidget", "data:"+ customWidget);
         if ("search_widget".equals(customWidget)) {
             //这里直接将search_widget删掉了
             mAppWidgetHost.deleteAppWidgetId(appWidgetId);
         } else {
             AppWidgetProviderInfo appWidget = mAppWidgetManager.getAppWidgetInfo(appWidgetId);

             d("addAppWidget", "configure:"+ appWidget.configure);
             if (appWidget.configure != null) {
                 //有配置，弹出配置
                 Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_CONFIGURE);
                 intent.setComponent(appWidget.configure);
                 intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);

                 startActivityForResult(intent, REQUEST_CREATE_APPWIDGET);
             } else {
                 //没有配置，直接添加
                 completeAddAppWidget(data);
             }
         }
     }

     /**
      * 请求添加一个新的widget:用于选取系统中的widget
      */
     private void showWidgetChooser() {
         int appWidgetId = mAppWidgetHost.allocateAppWidgetId();
         Intent pickIntent = new Intent(AppWidgetManager.ACTION_APPWIDGET_PICK);
         pickIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
         startActivityForResult(pickIntent, REQUEST_PICK_APPWIDGET);
     }

     /**
      * 添加widget
      * @param data
      */
     private void completeAddAppWidget(Intent data) {
         Bundle extras = data.getExtras();
         int appWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID, -1);

         d("completeAddAppWidget", "dumping extras content="+extras.toString());
         d("completeAddAppWidget", "appWidgetId:"+ appWidgetId);
         AppWidgetProviderInfo appWidgetInfo = mAppWidgetManager.getAppWidgetInfo(appWidgetId);

         View hostView = mAppWidgetHost.createView(this, appWidgetId, appWidgetInfo);
         frameLayout.setLayoutParams(new LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, appWidgetInfo.minHeight));
         frameLayout.addView(hostView);
     }

 }