Android example source code file (AppWidgetHostActivity.java)

This example Android source code file (AppWidgetHostActivity.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, app, appwidgetcontainerview, appwidgethostactivity, appwidgethostview, appwidgetmanager, appwidgetproviderinfo, configure_appwidget_request, content, discover_appwidget_request, host_id, intent, myappwidgetview, override, pending_appwidget_id, result_ok, string, ui, view, widget

The AppWidgetHostActivity.java Android example source code

/*
 * 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.android.tests.appwidgethost;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.appwidget.AppWidgetHost;
import android.appwidget.AppWidgetHostView;
import android.appwidget.AppWidgetProviderInfo;
import android.appwidget.AppWidgetManager;
import android.os.Bundle;
import android.util.Log;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.widget.LinearLayout;

public class AppWidgetHostActivity extends Activity
{
    static final String TAG = "AppWidgetHostActivity";

    static final int DISCOVER_APPWIDGET_REQUEST = 1;
    static final int CONFIGURE_APPWIDGET_REQUEST = 2;
    static final int HOST_ID = 1234;

    static final String PENDING_APPWIDGET_ID = "pending_appwidget";
    
    AppWidgetManager mAppWidgetManager;
    AppWidgetContainerView mAppWidgetContainer;

    public AppWidgetHostActivity() {
        mAppWidgetManager = AppWidgetManager.getInstance(this);
    }

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.appwidget_host);

        findViewById(R.id.add_appwidget).setOnClickListener(mOnClickListener);
        mAppWidgetContainer = (AppWidgetContainerView)findViewById(R.id.appwidget_container);

        if (false) {
            if (false) {
                mHost.deleteHost();
            } else {
                AppWidgetHost.deleteAllHosts();
            }
        }
    }

    View.OnClickListener mOnClickListener = new View.OnClickListener() {
        public void onClick(View v) {
            discoverAppWidget(DISCOVER_APPWIDGET_REQUEST);
        }
    };

    void discoverAppWidget(int requestCode) {
        Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_PICK);
        intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mHost.allocateAppWidgetId());
        startActivityForResult(intent, requestCode);
    }

    void configureAppWidget(int requestCode, int appWidgetId, ComponentName configure) {
        Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_CONFIGURE);
        intent.setComponent(configure);
        intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
        SharedPreferences.Editor prefs = getPreferences(0).edit();
        prefs.putInt(PENDING_APPWIDGET_ID, appWidgetId);
        prefs.commit();
        startActivityForResult(intent, requestCode);
    }

    void handleAppWidgetPickResult(int resultCode, Intent intent) {
        // BEGIN_INCLUDE(getExtra_EXTRA_APPWIDGET_ID)
        Bundle extras = intent.getExtras();
        int appWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID);
        // END_INCLUDE(getExtra_EXTRA_APPWIDGET_ID)
        if (resultCode == RESULT_OK) {
            AppWidgetProviderInfo appWidget = mAppWidgetManager.getAppWidgetInfo(appWidgetId);

            if (appWidget.configure != null) {
                // configure the AppWidget if we should
                configureAppWidget(CONFIGURE_APPWIDGET_REQUEST, appWidgetId, appWidget.configure);
            } else {
                // just add it as is
                addAppWidgetView(appWidgetId, appWidget);
            }
        } else {
            mHost.deleteAppWidgetId(appWidgetId);
        }
    }

    void handleAppWidgetConfigureResult(int resultCode, Intent data) {
        int appWidgetId = getPreferences(0).getInt(PENDING_APPWIDGET_ID, -1);
        Log.d(TAG, "resultCode=" + resultCode + " appWidgetId=" + appWidgetId);
        if (appWidgetId < 0) {
            Log.w(TAG, "was no preference for PENDING_APPWIDGET_ID");
            return;
        }
        if (resultCode == RESULT_OK) {
            AppWidgetProviderInfo appWidget = mAppWidgetManager.getAppWidgetInfo(appWidgetId);
            addAppWidgetView(appWidgetId, appWidget);
        } else {
            mHost.deleteAppWidgetId(appWidgetId);
        }
    }

    void addAppWidgetView(int appWidgetId, AppWidgetProviderInfo appWidget) {
        // Inflate the AppWidget's RemoteViews
        AppWidgetHostView view = mHost.createView(this, appWidgetId, appWidget);

        // Add it to the list
        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT);
        mAppWidgetContainer.addView(view, layoutParams);

        registerForContextMenu(view);
    }

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
        case DISCOVER_APPWIDGET_REQUEST:
            handleAppWidgetPickResult(resultCode, data);
            break;
        case CONFIGURE_APPWIDGET_REQUEST:
            handleAppWidgetConfigureResult(resultCode, data);
        }
    }

    protected void onStart() {
        super.onStart();
        mHost.startListening();
    }

    protected void onStop() {
        super.onStop();
        mHost.stopListening();
    }

    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenu.ContextMenuInfo menuInfo) {
        menu.add(ContextMenu.NONE, R.string.delete_appwidget, ContextMenu.NONE,
                R.string.delete_appwidget);
    }

    public boolean onContextItemSelected(MenuItem item) {
        MyAppWidgetView view = (MyAppWidgetView)item.getMenuInfo();
        switch (item.getItemId()) {
        case R.string.delete_appwidget:
            Log.d(TAG, "delete! " + view.appWidgetId);
            mAppWidgetContainer.removeView(view);
            mHost.deleteAppWidgetId(view.appWidgetId);
            break;
        }

        return true;
    }

    class MyAppWidgetView extends AppWidgetHostView implements ContextMenu.ContextMenuInfo {
        int appWidgetId;

        MyAppWidgetView(int appWidgetId) {
            super(AppWidgetHostActivity.this);
            this.appWidgetId = appWidgetId;
        }

        public ContextMenu.ContextMenuInfo getContextMenuInfo() {
            return this;
        }
    }

    AppWidgetHost mHost = new AppWidgetHost(this, HOST_ID) {
        protected AppWidgetHostView onCreateView(Context context, int appWidgetId, AppWidgetProviderInfo appWidget) {
            return new MyAppWidgetView(appWidgetId);
        }
    };
}