Android学习-01.switch开关

前面的内容以后有机会补充，现在从中级控件开始

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视图部分：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:layout_weight="1"
            android:layout_gravity="start"
            android:text="switch开关:" />

        <Switch
            android:id="@+id/sw_status"
            android:layout_width="80dp"
            android:layout_height="30dp"
            android:padding="5dp"
            android:layout_gravity="end" />

    </LinearLayout>

    <TextView
        android:id="@+id/tv_result"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:gravity="start" />

</LinearLayout>

对应Activity：

package com.example.chapter05;

import android.os.Bundle;
import android.widget.CompoundButton;
import android.widget.Switch;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

public class SwitchDefaultActivity extends AppCompatActivity implements CompoundButton.OnCheckedChangeListener {
    private TextView tv_result;
    private Switch sw_status;

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

        tv_result = findViewById(R.id.tv_result);
        sw_status = findViewById(R.id.sw_status);
        sw_status.setOnCheckedChangeListener(this);
    }

    @Override
    public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
        String desc = String.format("Switch开关的状态是:%s", b ? "open" : "close");
        tv_result.setText(desc);
    }
}

别忘了注册这个Act为主Act:

<activity
            android:name=".SwitchDefaultActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

最后效果：

 

 

完成！