AndroidStudio学习记录（5）：图像按钮ImageView的实现

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

<!-- ImageView 图片控件；Drawable对象或bitmap对象
        src：路径图片
        maxHeight/maxWidth
        scaleType:调整尺寸-->
    <androidx.constraintlayout.utils.widget.ImageFilterView
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:src="@mipmap/ic_launcher_round"
        android:id="@+id/myImg"/>
    <RadioGroup
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/rg_scale">
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/rb_center"
            android:text="Center"/>
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/rb_centerCrop"
            android:text="centerCrop"/>
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/rb_centerInside"
            android:text="centerInside"/>
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/rb_fitEnd"
            android:text="fitEnd"/>
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/rb_fitStart"
            android:text="fitStart"/>


    </RadioGroup>
</LinearLayout>

package com.aaa.proimg2;

import android.os.Bundle;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.RadioGroup;

import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;

public class MainActivity extends AppCompatActivity {

    //赋值
    ImageView myImg = (ImageView) findViewById(R.id.myImg);
    RadioGroup rg_scale = (RadioGroup) findViewById(R.id.rg_scale);
    RadioButton rb_center=(RadioButton) findViewById(R.id.rb_center);
    RadioButton rb_centerCrop=(RadioButton) findViewById(R.id.rb_centerCrop);
    RadioButton rb_centerInside=(RadioButton) findViewById(R.id.rb_centerInside);
    RadioButton rb_fitEnd=(RadioButton) findViewById(R.id.rb_fitEnd);
    RadioButton rb_fitStart=(RadioButton) findViewById( R.id.rb_fitStart);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);

        //针对单选按钮做测试：此处没有写完
        rg_scale.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int i) {
            switch (i){
                case R.id.rb_center:
                    myImg.setScaleType(ImageView.ScaleType.CENTER);break;

                case R.id.rb_centerCrop:
                    myImg.setScaleType(ImageView.ScaleType.CENTER_CROP);break;

                case  R.id.rb_centerInside:
                    myImg.setScaleType(ImageView.ScaleType.CENTER_INSIDE);break;

                case  R.id.rb_fitEnd:
                    myImg.setScaleType(ImageView.ScaleType.FIT_END);break;

                case  R.id.rb_fitStart:
                    myImg.setScaleType(ImageView.ScaleType.FIT_START);break;
                }
            }

        });
    }
}