中级控件——switch开关——系统控件switch开关

矫情吗；* 2023-09-28 14:26 345阅读 0赞

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package com.example.myapplication;
    
    import android.annotation.SuppressLint;
    import android.content.pm.ActivityInfo;
    import android.content.pm.PackageManager;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.widget.CheckBox;
    import android.widget.CompoundButton;
    import android.widget.Switch;
    import android.widget.TextView;
    import android.widget.Toast;
    
    
    public class MainActivity extends AppCompatActivity implements CompoundButton.OnCheckedChangeListener
    {
        private Switch sw_status; // 声明一个开关按钮对象
        private TextView tv_result; // 声明一个文本视图对象
    
        @Override
        protected void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
    
            // 从布局文件中获取名叫sw_status的开关按钮
            sw_status = findViewById(R.id.sw_status);
    
            // 从布局文件中获取名叫tv_result的文本视图
            tv_result = findViewById(R.id.tv_result);
    
            // 给开关按钮设置选择监听器，一旦用户点击它，就触发监听器的onCheckedChanged方法
            sw_status.setOnCheckedChangeListener(this);
    
            refreshResult(); // 刷新Switch按钮的开关说明
        }
    
        // 刷新Switch按钮的开关说明
        private void refreshResult() {
            String result = String.format("Switch按钮的状态是%s", (sw_status.isChecked()) ? "开" : "关");
            tv_result.setText(result);
        }
    
        // 选择事件的处理方法
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            refreshResult();
        }
    
    }

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