Android Studio —— 按钮点击事件

实例

     功能：点击按钮显示/隐藏进度条

     效果

 

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical">

    <ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
    </ProgressBar>

    <Button
        android:id="@+id/UserButton"
        android:layout_width="110dp"
        android:layout_height="40dp"
        android:text="显示或隐藏进度条"
        android:textSize="10dp"
        android:onClick="ButtonClick">
    </Button>

</LinearL





package com.example.application;

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;

public class MainActivity extends AppCompatActivity {

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

        Button UserButton = findViewById(R.id.UserButton);
        if(UserButton != null) {
            UserButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    ProgressBar progressBar = findViewById(R.id.progressBar);
                    if (progressBar != null) {
                        if(progressBar.getVisibility() == View.GONE){
                            progressBar.setVisibility(View.VISIBLE);
                        }
                        else{
                            progressBar.setVisibility(View.GONE);
                        }
                    }
                }
            });
        }
    }
}

 
 

举例

     点击按钮，打印输入框内容

// 找到按钮
Button UserButton = findViewById(R.id.UserButton);
if(UserButton != null) {
	
	// 监听按钮点击事件
    UserButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

			// 查找用户输入框
            EditText UserTextEdit = findViewById(R.id.UserTextEdit);
            if (UserTextEdit != null) {

				// 获取输入框内容并打印输出
                String UserTextEditText = UserTextEdit.getText().toString();
                Log.e("JXD", "输入的用户名是:"+UserTextEditText );
            }
        }
    });
}

 

关注

笔者 - jxd

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