Android图片ImageLoader的基本使用

Mainactivity

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import com.example.day6_imageloader.image.ImageUrl;
import com.example.day6_imageloader.util.ImageOptionsUtil;
import com.nostra13.universalimageloader.core.ImageLoader;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private Button All_btn;
    private ImageView Get_Img;
    private ImageLoader mImageLoader=ImageLoader.getInstance();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();

    }
  private void initView() {
        All_btn = findViewById(R.id.All_btn);
        Get_Img =  findViewById(R.id.Get_Img);

        All_btn.setOnClickListener(this);
    }
  @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.All_btn:
 mImageLoader.displayImage(ImageUrl.imageUrls[3],Get_Img,ImageOptionsUtil.getDisplay());
                break;
        } }}

AppLica类注册

import android.app.Application;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;

public class MyAppLica extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        ImageLoaderConfiguration loaderConfiguration=ImageLoaderConfiguration.createDefault(this);
        ImageLoader.getInstance().init(loaderConfiguration);
    }
}
------注意要在AndroidManifest.xml中注册
<application
        android:name=".applica.MyAppLica"
</application>

util工具类

import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;
import com.nostra13.universalimageloader.core.display.RoundedBitmapDisplayer;
public class ImageOptionsUtil {
public static DisplayImageOptions getDisplay(){
DisplayImageOptions displayImageOptions=new DisplayImageOptions.Builder()
.showStubImage(0)
/加载的地址为空时显示
.showImageForEmptyUri(0)
 //加载时显示的图片
.showImageOnLoading(R.mipmap.ic_launcher)
//加载错误时显示
.showImageOnFail(0)
//配置是否磁盘缓存
.cacheOnDisk(true)   //default
//配置是否内存缓存
.cacheInMemory(true)   //default
//配置图片如何缩放
.imageScaleType(ImageScaleType.IN_SAMPLE_INT)    //default
 //配置色彩模式
 .bitmapConfig(android.graphics.Bitmap.Config.RGB_565)     //default
 //显示效果：圆形 
 //.displayer(new CircleBitmapDisplayer()) 
 //显示效果：圆角
 .displayer(new RoundedBitmapDisplayer(20))
 //淡入效果
 .displayer(new FadeInBitmapDisplayer(2000))
     .build();
     return displayImageOptions;
 }
}

图片资源

public class ImageUrl {
    public final static String[] imageUrls = new String[]{
            "http://img.mukewang.com/54780ea90001f3b406000338.jpg",
            "http://img.mukewang.com/547ed1c9000150cc06000338.jpg",
            "http://img.mukewang.com/54214727000160e306000338.jpg",
            "http://img.mukewang.com/54125edc0001ce6306000338.jpg",
            "http://img.mukewang.com/548165820001b4b006000338.jpg",
            "http://img.mukewang.com/53d74f960001ae9d06000338.jpg",
            "http://img.mukewang.com/547d5a45000156f406000338.jpg",
            "http://img.mukewang.com/549bda090001c53e06000338.jpg",
            "http://img.mukewang.com/530f0ef700019b5906000338.jpg",
            "http://img.mukewang.com/550a87da000168db06000338.jpg",
            "http://img.mukewang.com/550a836c0001236606000338.jpg",
            "http://img.mukewang.com/550a78720001f37a06000338.jpg",
            "http://img.mukewang.com/5513e20600017c1806000338.jpg",
            "http://img.mukewang.com/5513a1b50001752806000338.jpg",
            "http://img.mukewang.com/550a33b00001738a06000338.jpg",
            "http://img.mukewang.com/551380400001da9b06000338.jpg",
            "http://img.mukewang.com/54c87c73000150cf06000338.jpg",
            "http://img.mukewang.com/5518bbe30001c32006000338.jpg",
            "http://img.mukewang.com/5518ecf20001cb4e06000338.jpg",
            "http://img.mukewang.com/551916790001125706000338.jpg",
            "http://img.mukewang.com/550b86560001009406000338.jpg",
            "http://img.mukewang.com/551b98ae0001e57906000338.jpg",
            "http://img.mukewang.com/5518c3d7000175af06000338.jpg",
            "http://img.mukewang.com/551b92340001c9f206000338.jpg",
            "http://img.mukewang.com/552640c300018a9606000338.jpg",
            "http://img.mukewang.com/551de0570001134f06000338.jpg",
            "http://img.mukewang.com/551e470500018dd806000338.jpg",
            "http://img.mukewang.com/5523711700016d1606000338.jpg",
            "http://img.mukewang.com/55249cf30001ae8a06000338.jpg",
            "http://img.mukewang.com/55237dcc0001128c06000338.jpg"
    };
}

布局文件

<?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"
    tools:context=".MainActivity">
    <Button
        android:layout_width="300dp"
        android:layout_gravity="center"
        android:layout_height="50dp"
        android:text="合成"
        android:id="@+id/All_btn"/>
    <ImageView
        android:layout_width="300dp"
        android:layout_height="300dp"
        android:layout_gravity="center"
        android:layout_marginTop="20dp"
        android:src="@drawable/ic_launcher_background"
        android:id="@+id/Get_Img"/>
</LinearLayout>