使用Glide入门示例，ListView图片浏览器的实现

使用Glide加载ListView示例

图片加载开源库中，看了很多资料对比，结论是在Universal-Image-Loader、Fresco、Picasso和Glide里，Glide表现最优秀：支持动画gif、缓存策略、流畅。
以此记录下入门练习：

compile 'com.github.bumptech.glide:glide:3.7.0'

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:id="@+id/content_glide"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.ming.mydrawtest.GlideActivity"
tools:showIn="@layout/activity_glide">

<ImageView
android:id="@+id/iv_glide"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:visibility="gone" />

<ListView
android:id="@+id/lv_glide"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:numColumns="2"></ListView>
</RelativeLayout>

<?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">
<ImageView
android:id="@+id/iv_item"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>

package com.ming.mydrawtest.adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;

import com.bumptech.glide.Glide;
import com.ming.mydrawtest.R;

import java.util.List;

/**
* Created by temp on 2016/10/27.
*/

public class MyGlideAdapter extends BaseAdapter {
private Context mContext;
private List<String> mUrls;
private LayoutInflater layoutInflater;
public MyGlideAdapter(Context context, List<String> urls) {
this.mContext = context;
this.mUrls = urls;
layoutInflater = LayoutInflater.from(context);
}

@Override
public int getCount() {
return mUrls.size();
}

@Override
public Object getItem(int position) {
return mUrls.get(position);
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
MyViewHold myViewHold=null;
if(convertView==null){
convertView = layoutInflater.inflate(R.layout.item_list,null);
myViewHold = new MyViewHold();
myViewHold.imageView = (ImageView) convertView.findViewById(R.id.iv_item);
convertView.setTag(myViewHold);
}else{
myViewHold = (MyViewHold) convertView.getTag();
}
Glide.with(mContext).load(mUrls.get(position)).into(myViewHold.imageView);
return convertView;
}
}
class MyViewHold {
public ImageView imageView;
}

package com.ming.mydrawtest;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.ListView;

import com.bumptech.glide.Glide;
import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
import com.bumptech.glide.load.resource.bitmap.BitmapTransformation;
import com.ming.mydrawtest.adapter.MyGlideAdapter;

import java.util.Arrays;
import java.util.List;

public class GlideActivity extends AppCompatActivity {
private Context mContext;
private ImageView ivGlide;
private MyGlideAdapter adapter;
private List<String> mUrls;
public static String[] eatFoodyImages = {
"http://i.imgur.com/rFLNqWI.jpg",
"http://i.imgur.com/C9pBVt7.jpg",
"http://i.imgur.com/rT5vXE1.jpg",
"http://i.imgur.com/aIy5R2k.jpg",
"http://i.imgur.com/MoJs9pT.jpg",
"http://i.imgur.com/S963yEM.jpg",
"http://i.imgur.com/rLR2cyc.jpg",
"http://i.imgur.com/SEPdUIx.jpg",
"http://i.imgur.com/aC9OjaM.jpg",
"http://i.imgur.com/76Jfv9b.jpg",
"http://i.imgur.com/fUX7EIB.jpg",
"http://i.imgur.com/syELajx.jpg",
"http://i.imgur.com/COzBnru.jpg",
"http://i.imgur.com/Z3QjilA.jpg",
};
private ListView lvGlide;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_glide);
mContext = this;
Glide.with(this);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
initView();
initData();
}

private void initView() {
mUrls = Arrays.asList(eatFoodyImages);
ivGlide = (ImageView) findViewById(R.id.iv_glide);
lvGlide = (ListView) findViewById(R.id.lv_glide);
adapter = new MyGlideAdapter(mContext, mUrls);
lvGlide.setAdapter(adapter);
}

private void initData() {
String imageUrl = "http://photocdn.sohu.com/20161025/Img471273295.jpg";
//        Glide.with(mContext).load("http://photocdn.sohu.com/20161025/Img471273295.jpg").into(ivGlide);
//        Glide.with(mContext).load("http://photocdn.sohu.com/20161025/Img471273295.jpg").override(300,300).into(ivGlide);
Glide.with(this).load(imageUrl).transform(new GlideRoundTransform(mContext)).into(ivGlide);
}

class GlideRoundTransform extends BitmapTransformation {
private float radius = 0f;

public GlideRoundTransform(Context context) {
this(context, 4);
}

public GlideRoundTransform(Context context, int dp) {
super(context);
this.radius = Resources.getSystem().getDisplayMetrics().density * dp;
}

@Override
protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {
return roundCrop(pool, toTransform);
}

private Bitmap roundCrop(BitmapPool pool, Bitmap source) {
if (source == null) return null;

Bitmap result = pool.get(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
if (result == null) {
result = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
}
Canvas canvas = new Canvas(result);
Paint paint = new Paint();
paint.setShader(new BitmapShader(source, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
paint.setAntiAlias(true);
RectF rectF = new RectF(0f, 0f, source.getWidth(), source.getHeight());
canvas.drawRoundRect(rectF, radius, radius, paint);
return result;
}

@Override
public String getId() {
return getClass().getName() + Math.round(radius);
}
}
}