Android自學之路6

將主活動中的監聽器封裝起來

package com.example.myapplication;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {
    private Button mBtnTextView;
    private Button mBtnButton;
    private Button mBtnEditText;
    private Button mBtnRadioButton;
    @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);
        setListeners();
    }
    private void setListeners()
    {
        OnClick onClick =new OnClick();
        mBtnEditText.setOnClickListener(onClick);
        mBtnTextView.setOnClickListener(onClick);
        mBtnButton.setOnClickListener(onClick);
        mBtnRadioButton.setOnClickListener(onClick);

    }
    private class OnClick implements View.OnClickListener{

        @Override
        public void onClick(View v) {
            Intent intent = null;
            switch (v.getId())
            {
                case R.id.btn_textview:intent =new Intent(MainActivity.this,TextviewActivity.class);
                    break;
                case R.id.btn_button:intent =new Intent(MainActivity.this,ButtonActivity.class);
                    break;
                case R.id.btn_edittext:intent =new Intent(MainActivity.this,EditTextActivity.class);
                    break;
                case R.id.btn_radiobutton:intent =new Intent(MainActivity.this,RadioButtonActivity.class);
                    break;
            }
            startActivity(intent);
        }
    }

}

RadioButton組件

<?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"
>
    <RadioGroup
        android:id="@+id/gr_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical">

    <RadioButton
        android:id="@+id/rb_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="男"
        android:textSize="20sp"
        android:textColor="#FF6600"
        />
    <RadioButton
        android:id="@+id/rb_2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="女"
        android:textSize="20sp"
        android:textColor="#FF6600"
        android:layout_below="@id/rb_1"
        />
    </RadioGroup>

</RelativeLayout>