Android开发：实现ProgressBar加载完成后自动启用按钮

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    android:padding="16dp"
    tools:context=".MainActivity">

    <ProgressBar
        android:id="@+id/progress_bar"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="100"
        android:progress="0"
        android:layout_marginBottom="24dp"/>

    <Button
        android:id="@+id/action_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="继续"
        android:enabled="false" /> <!-- 初始状态设置为禁用 -->

</LinearLayout>

package com.example.progressbarbutton; // 请根据您的实际包名修改

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.os.CountDownTimer;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private ProgressBar progressBar;
    private Button actionButton;
    private CountDownTimer countDownTimer;
    private final long totalLoadingTime = 5000; // 模拟加载总时长：5秒
    private final long interval = 50; // 更新间隔：50毫秒

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

        // 获取视图引用
        progressBar = findViewById(R.id.progress_bar);
        actionButton = findViewById(R.id.action_button);

        // 设置按钮点击监听器 (在启用后才可点击)
        actionButton.setOnClickListener(v -> {
            Toast.makeText(MainActivity.this, "按钮已启用并被点击！", Toast.LENGTH_SHORT).show();
            // 在这里可以添加按钮点击后需要执行的逻辑
        });

        // 初始化进度条的最大值 (与XML中一致，也可在此动态设置)
        progressBar.setMax(100);
        progressBar.setProgress(0); // 确保初始进度为0

        // 启动模拟加载
        startLoadingSimulation();
    }

    private void startLoadingSimulation() {
        countDownTimer = new CountDownTimer(totalLoadingTime, interval) {
            @Override
            public void onTick(long millisUntilFinished) {
                // 计算当前进度百分比
                int currentProgress = (int) (((totalLoadingTime - millisUntilFinished) * 100) / totalLoadingTime);
                progressBar.setProgress(currentProgress);
            }

            @Override
            public void onFinish() {
                // 确保进度条最终达到最大值
                progressBar.setProgress(progressBar.getMax());
                // 启用按钮
                actionButton.setEnabled(true);
                Toast.makeText(MainActivity.this, "加载完成，按钮已启用！", Toast.LENGTH_SHORT).show();
            }
        }.start();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        // 避免内存泄漏，在Activity销毁时取消CountDownTimer
        if (countDownTimer != null) {
            countDownTimer.cancel();
        }
    }
}