用Glide框架缓存压缩图片做一个网络图片查看器

先导入 Glide的包

ImgActivity.java

package com.example.a20200712;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import com.bumptech.glide.Glide;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;

public class ImgActivity extends AppCompatActivity {

    private EditText imgPath;
    private ImageView img;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.img_view_layout);
        imgPath = findViewById(R.id.img_layout_imgText);
        img = findViewById(R.id.img_layout_img);
    }

    public void imgviewonClick(View view) {
        Glide.with(ImgActivity.this).load(imgPath.getText().toString()).into(img);
    }

}

img_view_layout.xml

<?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">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/img_layout_imgText"
        android:hint="请输入地址">

    </EditText>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="查看"
        android:onClick="imgviewonClick"></Button>
    <ImageView
        android:id="@+id/img_layout_img"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></ImageView>
</LinearLayout>