寒假学习13

Android Studio:复选框CheckBox

MainActivity.java

package com.example.myapplicationfirst;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.RadioButton;

public class MainActivity extends AppCompatActivity {

    //声明空间
    private Button mBtnTextView;
    private Button mBtnButton;
    private Button mBtnEditText;
    private Button mBtnRadioButton;
    private Button mBtnCheckBox;

    //寻找事件
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mBtnTextView = findViewById(R.id.btn_textview);
        mBtnButton = findViewById(R.id.btn_button);
        mBtnEditText = findViewById(R.id.btn_edittext);
        mBtnRadioButton = findViewById(R.id.btn_radiobutton);
        mBtnCheckBox = findViewById(R.id.btn_checkbox);
        setListeners();
    }

    //监听事件
    private void setListeners(){
        OnClick onClick = new OnClick();
        mBtnTextView.setOnClickListener(onClick);
        mBtnButton.setOnClickListener(onClick);
        mBtnEditText.setOnClickListener(onClick);
        mBtnRadioButton.setOnClickListener(onClick);
        mBtnCheckBox.setOnClickListener(onClick);
    }

    //点击事件
    private class OnClick implements View.OnClickListener{

        @Override
        public void onClick(View v) {
            Intent intent = null;
            switch (v.getId()){
                case R.id.btn_textview:
                    //跳转到TextView演示界面
                    intent = new Intent(MainActivity.this,TextViewActivity.class);
                    break;
                case R.id.btn_button:
                    //跳转到Button演示界面
                    intent = new Intent(MainActivity.this,ButtonActivity.class);
                    break;
                case R.id.btn_edittext:
                    //跳转到EditText演示界面
                    intent = new Intent(MainActivity.this,EditTextActivity.class);
                    break;
                case R.id.btn_radiobutton:
                    //跳转到RadioButton演示界面
                    intent = new Intent(MainActivity.this, RadioButtonActivity.class);
                    break;
                case R.id.btn_checkbox:
                    //跳转到CheckBox演示界面
                    intent = new Intent(MainActivity.this, CheckBoxActivity.class);
                    break;
            }
            startActivity(intent);
        }
    }
}

CheckBoxActivity.java

package com.example.myapplicationfirst;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.Toast;

public class CheckBoxActivity extends AppCompatActivity {

    private CheckBox mCb1,mCb2,mCb3,mCb4;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_check_box);
        mCb1 = findViewById(R.id.cb_1);
        mCb2 = findViewById(R.id.cb_2);
        mCb3 = findViewById(R.id.cb_3);
        mCb4 = findViewById(R.id.cb_4);

       mCb1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
           @Override
           public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
               Toast.makeText(CheckBoxActivity.this, isChecked?"已选中":"已取消", Toast.LENGTH_SHORT).show();
           }
       });

        mCb2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                Toast.makeText(CheckBoxActivity.this, isChecked?"已选中":"已取消", Toast.LENGTH_SHORT).show();
            }
        });

        mCb3.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                Toast.makeText(CheckBoxActivity.this, isChecked?"已选中":"已取消", Toast.LENGTH_SHORT).show();
            }
        });

        mCb4.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                Toast.makeText(CheckBoxActivity.this, isChecked?"已选中":"已取消", Toast.LENGTH_SHORT).show();
            }
        });

    }
}

activity_main.xml

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

    <Button
        android:id="@+id/btn_textview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="TextView"
        android:textAllCaps="false"/>

    <Button
        android:id="@+id/btn_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Button"
        android:textAllCaps="false"/>

    <Button
        android:id="@+id/btn_edittext"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="EditText"
        android:textAllCaps="false"/>

    <Button
        android:id="@+id/btn_radiobutton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="RadioButton"
        android:textAllCaps="false"/>

    <Button
        android:id="@+id/btn_checkbox"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="CheckBox"
        android:textAllCaps="false"/>


</LinearLayout>

activity_check_box.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="20dp">

    <TextView
        android:id="@+id/tv_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="移动开发;"
        android:textSize="20sp"
        android:textColor="#000"/>

    <CheckBox
        android:id="@+id/cb_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Android"
        android:textSize="20sp"
        android:layout_below="@id/tv_title"
        android:layout_marginTop="20dp"/>

    <CheckBox
        android:id="@+id/cb_2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="IOS"
        android:textSize="20sp"
        android:layout_below="@id/cb_1"
        android:layout_marginTop="10dp"/>

    <CheckBox
        android:id="@+id/cb_3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="H5"
        android:textSize="20sp"
        android:layout_below="@id/cb_2"
        android:layout_marginTop="10dp"/>

    <CheckBox
        android:id="@+id/cb_4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="其他"
        android:textSize="20sp"
        android:layout_below="@id/cb_3"
        android:layout_marginTop="10dp"/>

</RelativeLayout>