问题
Glide默认加载http路径的图片，https图片不做处理是加载不出来的。很容易发生在开发用的http服务，线上用的是https，而忽略处理这一问题。
解决方案：
（1）创建一个支持https的OkHttpClient。
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.cert.CertificateException;
import java.util.Arrays;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import okhttp3.OkHttpClient;
import okhttp3.Protocol;
public class OkHttpsClient {
public static OkHttpClient getUnsafeOkHttpClient() {
final TrustManager[] trustAllCerts = new TrustManager[]{
new X509TrustManager() {
@Override
public void checkClientTrusted(java.security.cert.X509Certificate[] chain, String authType) throws CertificateException {
}
@Override
public void checkServerTrusted(java.security.cert.X509Certificate[] chain, String authType) throws CertificateException {
}
@Override
public java.security.cert.X509Certificate[] getAcceptedIssuers() {
return new java.security.cert.X509Certificate[0];
}
}
};
SSLSocketFactory socketFactory = null;
try {
try {
SSLContext sslContext = SSLContext.getInstance("TLS");
sslContext.init(null, trustAllCerts, new SecureRandom());
socketFactory = sslContext.getSocketFactory();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (KeyManagementException e) {
e.printStackTrace();
}
OkHttpClient okHttpClient = new OkHttpClient.Builder()
.sslSocketFactory(socketFactory)
.protocols(Arrays.asList(Protocol.HTTP_1_1))
.hostnameVerifier(new HostnameVerifier() {
@Override
public boolean verify(String hostname, SSLSession session) {
return true;
}
}).build();
return okHttpClient;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
（2）用支持https的okhttpclient构造OkHttpsUrlLoader
import android.content.Context;
import com.bumptech.glide.load.data.DataFetcher;
import com.bumptech.glide.load.model.GenericLoaderFactory;
import com.bumptech.glide.load.model.GlideUrl;
import com.bumptech.glide.load.model.ModelLoader;
import com.bumptech.glide.load.model.ModelLoaderFactory;
import java.io.InputStream;
public class OkHttpsUrlLoader implements ModelLoader<GlideUrl, InputStream> {
/**
* The default factory for {@link OkHttpsUrlLoader}s.
*/
public static class Factory implements ModelLoaderFactory<GlideUrl, InputStream> {
private static volatile okhttp3.OkHttpClient internalClient;
private okhttp3.OkHttpClient client;
private static okhttp3.OkHttpClient getInternalClient() {
if (internalClient == null) {
synchronized (Factory.class) {
if (internalClient == null) {
internalClient = OkHttpsClient.getUnsafeOkHttpClient();
}
}
}
return internalClient;
}
/**
* Constructor for a new Factory that runs requests using a static singleton client.
*/
public Factory() {
this(getInternalClient());
}
/**
* Constructor for a new Factory that runs requests using given client.
*/
public Factory(okhttp3.OkHttpClient client) {
this.client = client;
}
@Override
public ModelLoader<GlideUrl, InputStream> build(Context context, GenericLoaderFactory factories) {
return new OkHttpsUrlLoader(client);
}
@Override
public void teardown() {
// Do nothing, this instance doesn't own the client.
}
}
private final okhttp3.OkHttpClient client;
public OkHttpsUrlLoader(okhttp3.OkHttpClient client) {
this.client = client;
}
@Override
public DataFetcher<InputStream> getResourceFetcher(GlideUrl model, int width, int height) {
return new OkHttpsStreamFetcher(client, model);
}
}
（3）
import com.bumptech.glide.Priority;
import com.bumptech.glide.load.data.DataFetcher;
import com.bumptech.glide.load.model.GlideUrl;
import com.bumptech.glide.util.ContentLengthInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.ResponseBody;
public class OkHttpsStreamFetcher implements DataFetcher<InputStream> {
private final OkHttpClient client;
private final GlideUrl url;
private InputStream stream;
private ResponseBody responseBody;
public OkHttpsStreamFetcher(OkHttpClient client, GlideUrl url) {
this.client = client;
this.url = url;
}
@Override
public InputStream loadData(Priority priority) throws Exception {
Request.Builder requestBuilder = new Request.Builder()
.url(url.toStringUrl());
for (Map.Entry<String, String> headerEntry : url.getHeaders().entrySet()) {
String key = headerEntry.getKey();
requestBuilder.addHeader(key, headerEntry.getValue());
}
Request request = requestBuilder.build();
Response response = client.newCall(request).execute();
responseBody = response.body();
if (!response.isSuccessful()) {
throw new IOException("Request failed with code: " + response.code());
}
long contentLength = responseBody.contentLength();
stream = ContentLengthInputStream.obtain(responseBody.byteStream(), contentLength);
return stream;
}
@Override
public void cleanup() {
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (responseBody != null) {
try {
responseBody.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
@Override
public String getId() {
return url.getCacheKey();
}
@Override
public void cancel() {
}
}
（4）
import android.content.Context;
import com.bumptech.glide.Glide;
import com.bumptech.glide.GlideBuilder;
import com.bumptech.glide.load.model.GlideUrl;
import com.bumptech.glide.module.GlideModule;
import java.io.InputStream;
public class OkHttpsGlideModule implements GlideModule {
@Override
public void applyOptions(Context context, GlideBuilder builder) {
}
@Override
public void registerComponents(Context context, Glide glide) {
glide.register(GlideUrl.class, InputStream.class, new OkHttpsUrlLoader.Factory());
}
}
（5）AndroidManifest.xml当中添加metadata:
<meta-data
android:name="xxx.xxx.OkHttpsGlideModule"//包名
android:value="GlideModule" />
Glide相关博客推荐
郭霖专栏，系列文章对Glide源码进行细致的讲解
Glide的图片变换库：glide-transformations的项目主页地址（圆角啊灰度啊等等）
Glide 的基本使用可以查看下面这些文章：
图片加载库Glide介绍（这个和picasso有对比）
Glide图片加载库的使用（感觉这个基本的都有了）
Glide使用过程中可能会遇到的问题，感觉这篇介绍了很多很有标志性的问题
Glide坑遇记：宽度铺满高度自适应 & GIF加载之坑
