在 android 启动器中托管小部件

Question

我正在为 android 制作一个启动器，但我被困在小部件部分。我在互联网上搜索了大约一个半小时，试图弄清楚如何在我的应用程序中托管小部件，但没有运气。

我已经查看了一些库存启动器和 ADW 启动器代码，但两者都只有数英里的代码，这是我第一次制作启动器。

有人可以指导我如何将小部件添加到我的启动器中吗？或者至少发布任何链接/教程？请解释一下，因为这是我第一次。

Answer 1

试试这个：

final int APPWIDGET_HOST_ID = 2048;
final int REQUEST_PICK_APPWIDGET = 0;
final int REQUEST_CREATE_APPWIDGET = 5;

AppWidgetManager appWidgetManager;
AppWidgetHost appWidgetHost;

// Let user pick a widget from the list of intalled AppWidgets
public void selectWidget()
{
    int appWidgetId = this.appWidgetHost.allocateAppWidgetId();
    Intent pickIntent = new Intent(AppWidgetManager.ACTION_APPWIDGET_PICK);
    pickIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
    addEmptyData(pickIntent);
    startActivityForResult(pickIntent, REQUEST_PICK_APPWIDGET);
}

// For some reason you have to add this empty data, else it won't work
public void addEmptyData(Intent pickIntent)
{
    ArrayList<AppWidgetProviderInfo> customInfo = 
        new ArrayList<AppWidgetProviderInfo>();
    pickIntent.putParcelableArrayListExtra(
        AppWidgetManager.EXTRA_CUSTOM_INFO, customInfo);
    ArrayList<Bundle> customExtras = new ArrayList<Bundle>();
    pickIntent.putParcelableArrayListExtra(
        AppWidgetManager.EXTRA_CUSTOM_EXTRAS, customExtras);
};

@Override
protected void onActivityResult(int requestCode, int resultCode, 
                                Intent data) {
    if (resultCode == RESULT_OK ) {
        if (requestCode == REQUEST_PICK_APPWIDGET) {
            configureWidget(data);
        }
        else if (requestCode == REQUEST_CREATE_APPWIDGET) {
            createWidget(data);
        }
    }
    else if (resultCode == RESULT_CANCELED && data != null) {
        int appWidgetId = 
            data.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, -1);
        if (appWidgetId != -1) {
            appWidgetHost.deleteAppWidgetId(appWidgetId);
        }
    }
}

// Show configuration activity of the widget picked by the user
private void configureWidget(Intent data) {
    Bundle extras = data.getExtras();
    int appWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID, -1);
    AppWidgetProviderInfo appWidgetInfo = 
            appWidgetManager.getAppWidgetInfo(appWidgetId);
    if (appWidgetInfo.configure != null) {
        Intent intent = 
            new Intent(AppWidgetManager.ACTION_APPWIDGET_CONFIGURE);
        intent.setComponent(appWidgetInfo.configure);
        intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
        startActivityForResult(intent, REQUEST_CREATE_APPWIDGET);
    } else {
        createWidget(data);
    }
}

// Get an instance of the selected widget as a AppWidgetHostView
public void createWidget(Intent data) {
    Bundle extras = data.getExtras();
    int appWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID, -1);
    AppWidgetProviderInfo appWidgetInfo = appWidgetManager.getAppWidgetInfo(appWidgetId);

    AppWidgetHostView hostView = appWidgetHost.createView(this, appWidgetId, appWidgetInfo);
    hostView.setAppWidget(appWidgetId, appWidgetInfo);
    // Add  it on the layout you want
    myLayout.addView(hostView);
}

// Call this when you want to remove one from your layout
public void removeWidget(AppWidgetHostView hostView) {
    appWidgetHost.deleteAppWidgetId(hostView.getAppWidgetId());

    // Remove from your layout
    myLayout.removeView(hostView);
}

@Override
protected void onStart() {
    super.onStart();
    appWidgetManager = AppWidgetManager.getInstance(this);
    appWidgetHost = new AppWidgetHost(this, APPWIDGET_HOST_ID);

    // Start listening to pending intents from the widgets
    appWidgetHost.startListening();
}

@Override
protected void onStop() {
    super.onStop();
    appWidgetHost.stopListening();
}

您只需调用方法selectWidget() 即可显示设备上安装的AppWidgets 列表以供选择。

此代码有点像普通 Android 启动器的修改版本。

编辑：

要绑定小部件 ID，即更新小部件并响应用户交互，请参阅此处的解决方案：Widgets don't respond when re-added through code