android studio 轮询修改对象属性（修改多个textview的text）

android studio版本：23.3.1

例程名称：loopsettextviewtext

这几天在帮一个朋友做个数独小游戏，如下图：

要可以玩自定义游戏，点击清空后，所以数字要清除。

要把所有的内容清空，一共有81个textview，要是一条条写可累死了，于是想到了轮询访问的方法。这个方法应用场景可能不多，但要是用起来不会也麻烦。

下面是解决方法：

1.定义一个数组：

java 复制代码

        textViews = new TextView[3];
        textViews[0]=findViewById(R.id.textView1);
        textViews[1]=findViewById(R.id.textView2);
        textViews[2]=findViewById(R.id.textView3);

2.定义按钮点击事件：

java 复制代码

public void chaneText(View view) {
        for (TextView textView : textViews) {
            textView.setText("2");

        }
    }

此事件要在xml里指定：

XML 复制代码

 <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="107dp"
        android:layout_marginTop="18dp"
        android:text="Button"
        android:onClick="chaneText"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView2" />

全部代码：

xml:activity_main.xml

XML 复制代码

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.347"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.355" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="126dp"
        android:layout_marginTop="213dp"
        android:text="TextView"
        android:textAlignment="center"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="126dp"
        android:layout_marginTop="24dp"
        android:text="TextView"
        android:textAlignment="center"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView3" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="107dp"
        android:layout_marginTop="18dp"
        android:text="Button"
        android:onClick="chaneText"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView2" />

</androidx.constraintlayout.widget.ConstraintLayout>

mainactivity.java

java 复制代码

package com.shudu.loopsettextviewtext;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

public class MainActivity extends AppCompatActivity {
    private TextView[] textViews;
    private TextView textview1;
    private TextView textview2;
    private TextView textview3;
    private Button button1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main), (v, insets) -> {
            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
            return insets;
        });
        textview1 = (TextView) findViewById(R.id.textView1);
        textview2 = (TextView) findViewById(R.id.textView2);
        textview3 = (TextView) findViewById(R.id.textView3);
        button1 = (Button) findViewById(R.id.button1);
        textViews = new TextView[3];
        textViews[0]=findViewById(R.id.textView1);
        textViews[1]=findViewById(R.id.textView2);
        textViews[2]=findViewById(R.id.textView3);

    }
    public void chaneText(View view) {
        for (TextView textView : textViews) {
            textView.setText("搞定");

        }
    }
}

结果示意：