无法从okHttp&缓存加载数据翻新 [英] Not able to load data from cache okHttp & retrofit
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问题描述
这是我在调用api的代码，还为翻新版的okhttp定义了缓存:
Here is my code where i am calling api and also define cache for okhttp with retrofit:
public class DemoPresenter {
DemoView vDemoView;
private Context mContext;
public DemoPresenter(Context mcontext, DemoView vDemoView) {
this.vDemoView = vDemoView;
this.mContext = mcontext;
}
public void callAllProduct() {
if (vDemoView != null) {
vDemoView.showProductProgressBar();
}
OkHttpClient okHttpClient = new OkHttpClient.Builder()
.cache(new Cache(mContext.getCacheDir(), 10 * 1024 * 1024)) // 10 MB
.addInterceptor(new Interceptor() {
@Override
public okhttp3.Response intercept(Chain chain) throws IOException {
Request request = chain.request();
if (BasicUtility.isInternet(mContext)) {
request = request.newBuilder().header("Cache-Control", "public, max-age=" + 60).build();
} else {
request = request.newBuilder().header("Cache-Control", "public, only-if-cached, max-stale=" + 60 * 60 * 24 * 7).build();
}
return chain.proceed(request);
}
})
.build();
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("www.xyz.com/data/")
.addConverterFactory(GsonConverterFactory.create())
.client(okHttpClient)
.build();
AllApi productApiService = retrofit.create(AllApi.class);
Call<ProductData> call = productApiService.getProduct();
try {
call.enqueue(new Callback<ProductData>() {
@Override
public void onResponse(Call<ProductData> call, Response<ProductData> response) {
ArrayList<Product> alproducts = new ArrayList<>();
try {
alproducts = response.body().getProductData();
onSuccess(alproducts);
} catch (Exception e) {
}
}
@Override
public void onFailure(Call<ProductData> call, Throwable t) {
}
});
} catch (Exception e) {
}
}
private void onSuccess(ArrayList<Product> alproducts) {
if (vDemoView != null) {
vDemoView.hideProductProgressBar();
vDemoView.onProductSuccess(alproducts);
}
}
}
现在，从我的主要活动中，我将这个演讲者类称为:
Now from my main activity i am calling this presenter class:
DemoPresenter mDemoPresenter = new DemoPresenter(getApplicationContext(),this);
mDemoPresenter.callAllProduct();
现在，当我通过Internet连接运行此活动时，它运行良好，但是当我断开Internet连接并再次运行此活动时，它将不会从缓存中加载数据.
Now when i run this activity with Internet connectivity then it works fine but when i disconnected internet and run this activity again then it wont load data from cache .
如果没有互联网，如何从缓存中加载此数据?
How can i load this data from cache if there is not internet ?
推荐答案
您可以尝试以下方法:
public class DemoPresenter {
DemoView vDemoView;
private Context mContext;
private static final String CACHE_CONTROL = "Cache-Control";
private static final String TAG = DemoPresenter.class.getName();
public DemoPresenter(Context mcontext, DemoView vDemoView) {
this.vDemoView = vDemoView;
this.mContext = mcontext;
}
public void callAllProduct() {
if (vDemoView != null) {
vDemoView.showProductProgressBar();
}
OkHttpClient okHttpClient = new OkHttpClient.Builder()
.addInterceptor( provideOfflineCacheInterceptor() )
.addNetworkInterceptor( provideCacheInterceptor() )
.cache( provideCache() )
.build();
/* OkHttpClient okHttpClient = new OkHttpClient.Builder()
.cache(new Cache(mContext.getCacheDir(), 10 * 1024 * 1024)) // 10 MB
.addInterceptor(new Interceptor() {
@Override
public okhttp3.Response intercept(Chain chain) throws IOException {
Request request = chain.request();
if (BasicUtility.isInternet(mContext)) {
request = request.newBuilder().header("Cache-Control", "public, max-age=" + 60).build();
} else {
request = request.newBuilder().header("Cache-Control", "public, only-if-cached, max-stale=" + 60 * 60 * 24 * 7).build();
}
return chain.proceed(request);
}
})
.build();*/
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("www.xyz.com/data/")
.addConverterFactory(GsonConverterFactory.create())
.client(okHttpClient)
.build();
AllApi productApiService = retrofit.create(AllApi.class);
Call<ProductData> call = productApiService.getProduct();
try {
call.enqueue(new Callback<ProductData>() {
@Override
public void onResponse(Call<ProductData> call, Response<ProductData> response) {
ArrayList<Product> alproducts = new ArrayList<>();
try {
alproducts = response.body().getProductData();
onSuccess(alproducts);
} catch (Exception e) {
}
}
@Override
public void onFailure(Call<ProductData> call, Throwable t) {
}
});
} catch (Exception e) {
}
}
private void onSuccess(ArrayList<Product> alproducts) {
if (vDemoView != null) {
vDemoView.hideProductProgressBar();
vDemoView.onProductSuccess(alproducts);
}
}
public Interceptor provideOfflineCacheInterceptor () {
return new Interceptor()
{
@Override
public Response intercept (Chain chain) throws IOException
{
Request request = chain.request();
if (BasicUtility.isInternet(mContext))
{
CacheControl cacheControl = new CacheControl.Builder()
.maxStale( 7, TimeUnit.DAYS )
.build();
request = request.newBuilder()
.cacheControl( cacheControl )
.build();
}
return chain.proceed( request );
}
};
}
public static Interceptor provideCacheInterceptor ()
{
return new Interceptor()
{
@Override
public Response intercept (Chain chain) throws IOException
{
Response response = chain.proceed( chain.request() );
// re-write response header to force use of cache
CacheControl cacheControl = new CacheControl.Builder()
.maxAge( 1, TimeUnit.MINUTES )
.build();
return response.newBuilder()
.header( CACHE_CONTROL, cacheControl.toString() )
.build();
}
};
}
private Cache provideCache ()
{
Cache cache = null;
try
{
cache = new Cache( new File( mContext.getCacheDir(), "http-cache" ),
10 * 1024 * 1024 ); // 10 MB
}
catch (Exception e)
{
Log.e(TAG, "Could not create Cache!");
}
return cache;
}
}
为我工作得很好.
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