如何在新的文本视图中更改小部件的文本？

Question

我写了一个简单的小部件代码。 “添加 TextView”按钮创建 TextView N1、N2、N3，“在 TextView N2 中设置文本”按钮应更改 TextView N2 中的文本。如何更改 TextView N2 中的文本或获取 ID TextView N2？

MainActivity.java

package ru.test.widget;

import android.appwidget.AppWidgetManager;
import android.content.ComponentName;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RemoteViews;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button addTextView = findViewById(R.id.buttonAddTextView);
        addTextView.setOnClickListener(this);

        Button setText = findViewById(R.id.buttonSetText);
        setText.setOnClickListener(this);

    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.buttonAddTextView:
                addTextView();
                break;
            case R.id.buttonSetText:
                setText();
                break;
        }
    }

    private void addTextView() {
        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(this);
        ComponentName thisWidget = new ComponentName(this, AppWidget.class);
        int[] appWidgetId = appWidgetManager.getAppWidgetIds(thisWidget);

        RemoteViews views = new RemoteViews(this.getPackageName(), R.layout.app_widget);
        for (int i = 0; i < 3; i++) {
            RemoteViews textView = new RemoteViews(getPackageName(), R.layout.text_view_layout);
            textView.setTextViewText(R.id.textView1, "TextView number " + String.valueOf(i));
            views.addView(R.id.appWidgetLinearLayout, textView);
        }
        appWidgetManager.updateAppWidget(appWidgetId, views);

    }

    private void setText() {
        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(this);
        ComponentName thisWidget = new ComponentName(this, AppWidget.class);
        int[] appWidgetId = appWidgetManager.getAppWidgetIds(thisWidget);
        RemoteViews views = new RemoteViews(this.getPackageName(), R.layout.app_widget);
        views.setTextViewText(R.id.textView1, "Text !!!!");
        appWidgetManager.updateAppWidget(appWidgetId, views);
    }
}

AppWidget.java

package ru.test.widget;

import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.Context;
import android.widget.RemoteViews;

/**
 * Implementation of App Widget functionality.
 */
public class AppWidget extends AppWidgetProvider {

    static void updateAppWidget(Context context, AppWidgetManager appWidgetManager,
                                int appWidgetId) {

        CharSequence widgetText = context.getString(R.string.appwidget_text);
        // Construct the RemoteViews object
        RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.app_widget);
        views.setTextViewText(R.id.appWidgetText, widgetText);

        // Instruct the widget manager to update the widget
        appWidgetManager.updateAppWidget(appWidgetId, views);
    }

    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        // There may be multiple widgets active, so update all of them
        for (int appWidgetId : appWidgetIds) {
            updateAppWidget(context, appWidgetManager, appWidgetId);
        }
    }

    @Override
    public void onEnabled(Context context) {
        // Enter relevant functionality for when the first widget is created
    }

    @Override
    public void onDisabled(Context context) {
        // Enter relevant functionality for when the last widget is disabled
    }
}

MainActivity.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:orientation="vertical">

        <Button
            android:id="@+id/buttonAddTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Add TextView" />

        <Button
            android:id="@+id/buttonSetText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Set text in new TextView N2" />
    </LinearLayout>
</android.support.constraint.ConstraintLayout>

app_widget_info.xml

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:initialKeyguardLayout="@layout/app_widget"
    android:initialLayout="@layout/app_widget"
    android:minWidth="40dp"
    android:minHeight="40dp"
    android:previewImage="@drawable/example_appwidget_preview"
    android:resizeMode="horizontal|vertical"
    android:updatePeriodMillis="86400000"
    android:widgetCategory="home_screen"></appwidget-provider>

app_widget.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#09C"
    android:padding="@dimen/widget_margin">
    <LinearLayout
        android:id="@+id/appWidgetLinearLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
        <TextView
            android:id="@+id/appWidgetText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"
            android:layout_margin="8dp"
            android:background="#000000"
            android:text="@string/appwidget_text"
            android:textColor="#ffffff"
            android:textSize="8sp"/>
    </LinearLayout>
</RelativeLayout>

text_view_layout.xml

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    android:layout_margin="8dp"
    android:text="TextView"
    android:background="#7E2E2E"
    android:textColor="#ffffff"
    android:textSize="8sp"/>

Answer 1

问题是您不能遍历远程视图的子视图。由于您正在动态地将新元素添加到 remoteview，因此您无法确定确切的孩子并更改他的属性。所以有两种方法可以实现你想要的。

1. 为每个文本视图创建一个具有不同 id 的远程视图，并使用 partiallyUpdateAppWidget 更新一个确切的 id（您可以阅读此here）。

2. 在 appwidget 中创建一个列表视图，并且只更改一项中的内容（阅读如何使用 appwidget 与集合 here）