what method I must use Instead of findViewById in app widget?

问题

When I use findViewById() I get an error.
What method should I use, instead of findViewById() in my app widget?

P.S.: I want to do something like:

 Button a = (Button) findViewById(R.id.button);

in my screen widget

回答1:

You don't need a findViewById() in Widget just do this

create a static variable, which will be your onClick name tag:

private static final String MyOnClick = "Button OnClick";

Set this onClick tag to your view as below:

RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.activity_main);
views.setTextViewText(R.id.your_button, "Button Name");
views.setOnClickPendingIntent(R.id.your_button, MyOnClick);

get Button Click listener like bellow

public void onReceive(Context context, Intent intent) {

if (MyOnClick.equals(intent.getAction())){
    //your onClick action is here
  }
};

Here total code

import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.widget.RemoteViews;

public class Widget extends AppWidgetProvider {
private static final String SYNC_CLICKED    = "automaticWidgetSyncButtonClick";

@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
    RemoteViews remoteViews;
    ComponentName watchWidget;

    remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget_layout);
    watchWidget = new ComponentName(context, Widget.class);

    remoteViews.setOnClickPendingIntent(R.id.sync_button, getPendingSelfIntent(context, SYNC_CLICKED));
    appWidgetManager.updateAppWidget(watchWidget, remoteViews);
}

@Override
public void onReceive(Context context, Intent intent) {
    // TODO Auto-generated method stub
    super.onReceive(context, intent);

    if (SYNC_CLICKED.equals(intent.getAction())) {

        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);

        RemoteViews remoteViews;
        ComponentName watchWidget;

        remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget_layout);
        watchWidget = new ComponentName(context, Widget.class);

        remoteViews.setTextViewText(R.id.sync_button, "TESTING");

        appWidgetManager.updateAppWidget(watchWidget, remoteViews);

    }
}

protected PendingIntent getPendingSelfIntent(Context context, String action) {
    Intent intent = new Intent(context, getClass());
    intent.setAction(action);
    return PendingIntent.getBroadcast(context, 0, intent, 0);
}

}

回答2:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="40dp"
android:background="#09C"
android:padding="@dimen/widget_margin">


<TextView
    android:layout_width="300dp"
    android:layout_height="match_parent"
    android:textSize="20sp"
    android:textColor="#FFFFFF"
    android:paddingTop="5dp"
    android:text="New Text"
    android:id="@+id/txt"
    android:layout_centerVertical="true" />

<Button
    android:layout_width="50dp"
    android:layout_height="wrap_content"
    android:textColor="#FFFFFF"
    android:text="^"
    android:id="@+id/klik"
    android:background="#09C"
    android:layout_alignParentTop="true"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true" />

来源：https://stackoverflow.com/questions/44588098/what-method-i-must-use-instead-of-findviewbyid-in-app-widget

标签

android

android-widget