Android WebView的加载超时处理方案

public class MainActivity extends AppCompatActivity {
    private WebView webView;
    private Handler mHandler;
    private Timer timer;
    private long timeout = 5000; // 超时时间设为5秒
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentphpView(R.layout.activity_main);
        webView = findViewById(R.ijsd.webView);
        mHandler = new Handler();
        initWebView();
    }
 
    private void initWebView() {
        webView.getSettings().setJavaScriptEnabled(true);
        webView.setWebViewClient(new WebViewClient() {
            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                super.onPageStarted(view, url, favicon);
                startTimer(); // 开始计时
            }
 
            @Override
            public void onPageFinished(WebView view, String url) {
                super.onPageFinished(view, url);
                cancelTimer(); // 页面加载完成，取消计时器
            }
        });
        webView.loadUrl("http://www.example.com"); // 加载网页
    }
 
    private void startTimer() {
        timer = new Timer();
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                if (webView.getProgress() < 100) {
                    handleTimeout(); // 执行超时处理逻辑
                }
            }
        }, timeout);
    }
 
    private void cancelTimer() {
        if (timer != null) {
            timer.cancel();
            timer = null;
        }
    }
 
    private void handleTimeout() {
        // 在这里执行超时后的处理逻辑，例如显示一个自定义的超时页面
        Message message = mHandler.obtainMessage();
        message.what = 0x101; // 自定义一个消息标识
        mHandler.sendMessage(message);
    }
}

import os
 
class TodoManager:
    def __init__(self, filename='toDOS.txt'):
        self.filename = filename
        self.todos = self.load_todos()
 
    def load_todos(self):
        if not os.path.exists(self.filename):
            return []
        with open(self.filename, 'r') as file:
            return [line.strip() for line in file]
 
    def save_todos(self):
        with open(self.filename, 'w') as file:
            for todo in self.todos:
                file.write(todo + '\n')
 
    def add_todo(self, todo):
        self.todos.append(todo)
        self.save_todos()
 
    def view_todos(self):
        for index, todo in enumerate(self.todos):
            print(f"{index + 1}. {todo}")
 
    def delete_todo(self, index):
        if 0 <= index < len(self.todos):
            del self.todos[index]
            self.save_todos()
        else:
            prhttp://www.chinasem.cnint("Invalid index!")
 
def main():
    todo_manager = TodoManager()
    while True:
        print("\nTodo Manager")
        print("1. Add Todo")
        print("2. View Todos")
        print("3. Delete Todo")
        print("4. Exit")
        choice = input("Enter your choice: ")
        if choice == '1':
            todo = input("Enter the todo: ")
            todo_manager.add_todo(todo)
        elif choice == '2':
            todo_manager.view_todos()
        elif choice == '3':
            index = int(input("Enter the index of the todo to delete: ")) - 1
            todo_manager.delete_todo(index)
        elif choice == '4':
            break
        else:
            print("Invalid choice!")
 
if __name__ == '__main__':
    main()

# 这是一个简单的Python程序示例
 
# 定义变量
age = 30  # 整数类型变量
name = "Alice"  # 字符串类型变量
is_student = False  # 布尔类型变量
 
# 常量（在Python中通常使用全大写字母表示）
PI = 3.14159
 
# 使用运算符进行计算
sum_of_ages = age + 5  # 算术运算
is_older = age > 25  # 比较运算
 
# 条件语句
if is_older:
    print("你已经超过25岁了。")
else:
    print("你还不到25岁。")
 
# 循环语句
for i in range(5):  # 循环5次
    print(f"这是第 {i+1} 次循环。")
 
# 函数定义和调用
def greet(person_name):
    print(f"你好，{person_name}！")
 
greet(name)  # 调用函数并传递参数