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:
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:
public void chaneText(View view) {for (TextView textView : textViews) {textView.setText("2");}}
此事件要在xml里指定:
<Buttonandroid: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 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"><TextViewandroid: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" /><TextViewandroid: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" /><TextViewandroid: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" /><Buttonandroid: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
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;@Overrideprotected 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: