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

package com.stone.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，長按，彈出widget選擇界面，
 * 選擇的widget有配置就先彈出，
 * 創建widget的view 將view加載到 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;		//用於標識
	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);
        //開始監聽widget的變化
        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);
            }
        }
    }
    
    /**
     * 選中了某個widget之後，根據是否有配置來決定直接添加還是彈出配置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)) {
        	//這裡直接將search_widget刪掉了
            mAppWidgetHost.deleteAppWidgetId(appWidgetId);
        } else {
            AppWidgetProviderInfo appWidget = mAppWidgetManager.getAppWidgetInfo(appWidgetId);
            
            d("addAppWidget", "configure:"+ appWidget.configure);
            if (appWidget.configure != null) {
            	//有配置，彈出配置
                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 {
            	//沒有配置，直接添加
            	completeAddAppWidget(data);
            }
        }
    }
    
    /**
     * 請求添加一個新的widget:用於選取系統中的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); 
    }

}

參考：

http://chroya.iteye.com/blog/825407