将字符串从小部件配置屏幕传输到 AppWidget 本身？

Question

我正在创建一个天气 Widget.The 第一次将小部件拖到主屏幕时，应该会出现一个配置屏幕，其中包含代表三个城市的三个按钮。当用户单击一个按钮（比如哥本哈根）时，我希望将字符串 "Copenhagen"" 传输到 Widget 本身，这样它就可以获取哥本哈根的 fetech 天气数据并将其显示给用户。我该怎么做真的做到了吗？

AppWidget 配置屏幕

小部件屏幕

Answer 1

我将解释使用 SharedPreferences 的解决方案。

您确实需要两个 java 文件。 App Widget Configuration Activity（我称之为 Configure）和 AppWidgetProvider（我称之为 WeatherWidget）。
您将需要两个 xml 文件，定义配置 activity 和小部件的布局（我将我的命名为 activity_configure.xml 和 weather_widget.xml) .
您将需要一个清单文件和一个小部件信息文件（我将我的命名为 weather_widget_info

这里是Configure

中的相关代码

public class Configure extends AppCompatActivity {
    private int widgetID;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_configure);

    // if the user hits back button
    setResult(RESULT_CANCELED);

    // get widgetID for this widget instance
    Bundle extras = getIntent().getExtras();
    if (extras != null) {
        widgetID = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);
    }

    Button copenhagenButton = (Button) findViewById(R.id.copenhagenButton);
    copenhagenButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            saveData("Copenhagen");
            resultOK();
        }
    });

    Button stockholmButton = (Button) findViewById(R.id.stockholmButton);
    stockholmButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            saveData("Stockholm");
            resultOK();
        }
    });

    Button osloButton = (Button) findViewById(R.id.osloButton);
    osloButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            saveData("Oslo");
            resultOK();
        }
    });

}

private void saveData(String cityName) {
    String widgetIDString = Integer.toString(widgetID);
    SharedPreferences prefs = this.getSharedPreferences(widgetIDString, Context.MODE_PRIVATE);
    SharedPreferences.Editor edit = prefs.edit();
    edit.putString("city", cityName);
    edit.commit();
}

private void resultOK() {

    // send an onUpdate() message to the widget via a broadcast
    Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_UPDATE, null, this, WeatherWidget.class);
    intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, new int[]{widgetID});
    sendBroadcast(intent);

    // signal OK
    Intent resultValue = new Intent();
    resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, widgetID);
    setResult(RESULT_OK, resultValue);
    finish();
}

}

这里是WeatherWidget的相关代码

public class WeatherWidget extends AppWidgetProvider {
final static String TAG = "stille";
private int widgetID;
private String city="N/A";
RemoteViews views;

@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
    // There may be multiple widgets active, so update all of them
    final int N = appWidgetIds.length;
    for (int i = 0; i < N; i++) {
        widgetID = appWidgetIds[i];
        loadCity(context);
        views = new RemoteViews(context.getPackageName(), R.layout.weather_widget);
        views.setTextViewText(R.id.location, city);
        appWidgetManager.updateAppWidget(widgetID, views);
    }
}

private void loadCity(Context context) {
    String widgetIDString = Integer.toString(widgetID);
    SharedPreferences prefs = context.getSharedPreferences(widgetIDString, Context.MODE_PRIVATE);
    String cityName = prefs.getString("city", "N/A ");
    city = cityName;
}

}

将字符串从小部件配置屏幕传输到 AppWidget 本身？

Transfer a string from widget configuration screen to the AppWidget itself?

configuration

android

widget

transfer

info