第一步简单实现android确定和退出按钮-小白必备

简单实现android确定和退出按钮

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    <EditText
        android:id="@+id/text1"
        android:layout_width="300dp"
        android:layout_height="50dp"
        android:ems="20"
        android:maxLength="5"
        />

    <Button
        android:id="@+id/finish"
        android:layout_width="wrap_content"
        android:layout_height="50dp"
        android:text="退出"

        />
    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="50dp"
        android:text="确定"

        />
</LinearLayout>

package com.example.lianxi;

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

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
private TextView resultView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
        Button btn = this.findViewById(R.id.btn);
        Button fin = findViewById(R.id.finish);
        btn.setonClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this,MainActivity.class);
                MainActivity.this.startActivity(intent);
            }
        });
        fin.setonClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });
   }
}