metrics = new AtomicReference<>();
41 |
42 | @Override
43 | protected void onCreate(Bundle savedInstanceState) {
44 | super.onCreate(savedInstanceState);
45 |
46 | // When debugging, the net log (https://www.chromium
47 | // .org/developers/design-documents/network-stack/netlog)
48 | // is an extremely useful tool to figure out what's going on in the network stack. However,
49 | // because it's a JSON file, it's quite sensitive to correct formatting,so we must ensure
50 | // that it's always closed properly.
51 | startNetLog();
52 | Thread.setDefaultUncaughtExceptionHandler((thread, throwable) -> {
53 | stopNetLog();
54 | });
55 |
56 | setContentView(R.layout.images_activity);
57 | setUpToolbar();
58 | swipeRefreshLayout = findViewById(R.id.images_activity_layout);
59 | swipeRefreshLayout.setOnRefreshListener(this::loadItems);
60 | loadItems();
61 | }
62 |
63 | @Override
64 | protected void onDestroy() {
65 | super.onDestroy();
66 | stopNetLog();
67 | }
68 |
69 | private void loadItems() {
70 | metrics.set(new CronetMetrics(0, 0));
71 | getCronetApplication().imagesToLoadCeiling.incrementAndGet();
72 |
73 | RecyclerView cronetView = findViewById(R.id.images_view);
74 |
75 | GridLayoutManager gridLayoutManager =
76 | new GridLayoutManager(this, 2);
77 |
78 | cronetView.setLayoutManager(gridLayoutManager);
79 | cronetView.setAdapter(new ViewAdapter(this));
80 | cronetView.setItemAnimator(new DefaultItemAnimator());
81 | onItemsLoadComplete();
82 |
83 | }
84 |
85 | private void onItemsLoadComplete() {
86 | swipeRefreshLayout.setRefreshing(false);
87 | }
88 |
89 | private void setUpToolbar() {
90 | Toolbar toolbar = findViewById(R.id.toolbar);
91 | setSupportActionBar(toolbar);
92 | getSupportActionBar().setDisplayShowTitleEnabled(false);
93 | ((TextView) toolbar.findViewById(R.id.title)).setText(R.string.toolbar_title);
94 | }
95 |
96 | /**
97 | * This calculates and sets on the UI the latency of loading images with Cronet.
98 | *
99 | * This method must be thread safe as it can be called from multiple Cronet callbacks
100 | * in parallel.
101 | */
102 | public void onCronetImageLoadSuccessful(long requestLatencyNanos) {
103 | CronetMetrics delta = new CronetMetrics(requestLatencyNanos, 1);
104 | CronetMetrics newMetrics = metrics.accumulateAndGet(
105 | delta,
106 | (left, right) -> new CronetMetrics(
107 | left.totalLatencyNanos + right.totalLatencyNanos,
108 | left.numberOfLoadedImages + right.numberOfLoadedImages));
109 |
110 |
111 | if (newMetrics.numberOfLoadedImages == Math.min(
112 | getCronetApplication().imagesToLoadCeiling.get(),
113 | ImageRepository.numberOfImages())) {
114 | long averageLatencyNanos =
115 | newMetrics.totalLatencyNanos / newMetrics.numberOfLoadedImages;
116 | android.util.Log.i(TAG,
117 | "All Cronet Requests Complete, the average latency is " + averageLatencyNanos
118 | + " nanos.");
119 | final TextView cronetTime = findViewById(R.id.cronet_time_label);
120 | runOnUiThread(() -> cronetTime.setText(String.format(getResources()
121 | .getString(R.string.images_loaded), averageLatencyNanos)));
122 | }
123 | }
124 |
125 | CronetApplication getCronetApplication() {
126 | return ((CronetApplication) getApplication());
127 | }
128 |
129 | private CronetEngine getCronetEngine() {
130 | return getCronetApplication().getCronetEngine();
131 | }
132 |
133 | /**
134 | * Method to start NetLog to log Cronet events.
135 | * Find more info about Netlog here:
136 | * https://www.chromium.org/developers/design-documents/network-stack/netlog
137 | */
138 | private void startNetLog() {
139 | File outputFile;
140 | try {
141 | outputFile = File.createTempFile("cronet", "log",
142 | this.getExternalFilesDir(null));
143 | getCronetEngine().startNetLogToFile(outputFile.toString(), false);
144 | } catch (IOException e) {
145 | android.util.Log.e(TAG, e.toString());
146 | }
147 | }
148 |
149 | /**
150 | * Method to properly stop NetLog
151 | */
152 | private void stopNetLog() {
153 | getCronetEngine().stopNetLog();
154 | }
155 |
156 | /**
157 | * Holder of multiple metrics that can be atomically updated.
158 | */
159 | private static class CronetMetrics {
160 | final long totalLatencyNanos;
161 | final int numberOfLoadedImages;
162 |
163 | CronetMetrics(long totalLatencyNanos, int numberOfLoadedImages) {
164 | this.totalLatencyNanos = totalLatencyNanos;
165 | this.numberOfLoadedImages = numberOfLoadedImages;
166 | }
167 | }
168 | }
169 |
--------------------------------------------------------------------------------
/android/app/src/main/java/com/google/samples/cronet_sample/CronetApplication.java:
--------------------------------------------------------------------------------
1 | package com.google.samples.cronet_sample;
2 |
3 | import android.app.Application;
4 | import android.content.Context;
5 | import android.widget.Toast;
6 |
7 | import com.google.android.gms.common.GooglePlayServicesNotAvailableException;
8 | import com.google.android.gms.common.GooglePlayServicesRepairableException;
9 | import com.google.android.gms.net.CronetProviderInstaller;
10 | import com.google.android.gms.tasks.Task;
11 |
12 | import org.chromium.net.CronetEngine;
13 | import org.chromium.net.CronetProvider;
14 |
15 | import java.util.Collections;
16 | import java.util.List;
17 | import java.util.concurrent.ExecutorService;
18 | import java.util.concurrent.Executors;
19 | import java.util.concurrent.atomic.AtomicInteger;
20 | import java.util.stream.Collectors;
21 |
22 | public class CronetApplication extends Application {
23 |
24 | // We recommend that each application uses a single, global CronetEngine. This allows Cronet
25 | // to maximize performance. This can either be achieved using a global static . In this example,
26 | // we initialize it in an Application class to manage lifecycle of the network log.
27 | private CronetEngine cronetEngine;
28 |
29 | // Executor that will invoke asynchronous Cronet callbacks. Like with the Cronet engine, we
30 | // recommend that it's managed centrally.
31 | private ExecutorService cronetCallbackExecutorService;
32 |
33 | // We use this variable to demonstrate how Cronet's caching behaves. Each subsequent attempt to
34 | // load the images fetches one more, up to the number of images specified in ImageRepository.
35 | // Don't do this in your production application, it's a dirty hack :).
36 | public final AtomicInteger imagesToLoadCeiling = new AtomicInteger();
37 |
38 | @Override
39 | public void onCreate() {
40 | super.onCreate();
41 | cronetEngine = createDefaultCronetEngine(this);
42 | cronetCallbackExecutorService = Executors.newFixedThreadPool(4);
43 | }
44 |
45 | public CronetEngine getCronetEngine() {
46 | return cronetEngine;
47 | }
48 |
49 | public ExecutorService getCronetCallbackExecutorService() {
50 | return cronetCallbackExecutorService;
51 | }
52 |
53 | private static CronetEngine createDefaultCronetEngine(Context context) {
54 | // Cronet makes use of modern protocols like HTTP/2 and QUIC by default. However, to make
55 | // the most of servers that support QUIC, one must either specify that a particular domain
56 | // supports QUIC explicitly using QUIC hints, or enable the on-disk cache.
57 | //
58 | // When a QUIC hint is provided, Cronet will attempt to use QUIC from the very beginning
59 | // when communicating with the server and if that fails, we fall back to using HTTP. If
60 | // no hints are provided, Cronet uses HTTP for the first request issued to the server.
61 | // If the server indicates it does support QUIC, Cronet stores the information and will use
62 | // QUIC for subsequent request to that domain.
63 | //
64 | // We recommend that QUIC hints are provided explicitly when working with servers known
65 | // to support QUIC.
66 | return new CronetEngine.Builder(context)
67 | // The storage path must be set first when using a disk cache.
68 | .setStoragePath(context.getFilesDir().getAbsolutePath())
69 |
70 | // Enable on-disk cache, this enables automatic QUIC usage for subsequent requests
71 | // to the same domain across application restarts. If you also want to cache HTTP
72 | // responses, use HTTP_CACHE_DISK instead. Typically you will want to enable caching
73 | // in full, we turn it off for this demo to better demonstrate Cronet's behavior
74 | // using net protocols.
75 | .enableHttpCache(CronetEngine.Builder.HTTP_CACHE_DISK_NO_HTTP, 100 * 1024)
76 |
77 | // HTTP2 and QUIC support is enabled by default. When both are enabled (and no hints
78 | // are provided), Cronet tries to use both protocols and it's nondeterministic which
79 | // one will be used for the first few requests. As soon as Cronet is aware that
80 | // a server supports QUIC, it will always attempt to use it first. Try disabling
81 | // and enabling HTTP2 support and see how the negotiated protocol changes! Also try
82 | // forcing a new connection by enabling and disabling flight mode after the first
83 | // request to ensure QUIC usage.
84 | .enableHttp2(true)
85 | .enableQuic(true)
86 |
87 | // Brotli support is NOT enabled by default.
88 | .enableBrotli(true)
89 |
90 | // One can provide a custom user agent if desired.
91 | .setUserAgent("CronetSampleApp")
92 |
93 | // As noted above, QUIC hints speed up initial requests to a domain. Multiple hints
94 | // can be added. We don't enable them in this demo to demonstrate how QUIC
95 | // is being used if no hints are provided.
96 |
97 | // .addQuicHint("storage.googleapis.com", 443, 443)
98 | // .addQuicHint("www.googleapis.com", 443, 443)
99 | .build();
100 | }
101 |
102 | private static void createCustomCronetEngine(Context context) {
103 | // For most users of Cronet on modern devices it should be sufficient to just create
104 | // a CronetEngine.Builder directly, as demonstrated in createDefaultCronetEngine().
105 | // The implementation selects the "best" (the most recent) implementation of Cronet
106 | // available on the device. However, if the application requires more control over which
107 | // Cronet engine is selected, we allow that too.
108 |
109 | // To guarantee that a Google Play Services Cronet implementation is available,
110 | // one can explicitly install the Play Services Cronet provider. The returned task can
111 | // then be used to either proceed with creating a CronetEngine, launching an intent to
112 | // upgrade Google Play Services, or handling Play Services absence gracefully.
113 | Task installTask = CronetProviderInstaller.installProvider(context);
114 | installTask.addOnCompleteListener(
115 | task -> {
116 | if (task.isSuccessful()) {
117 | // create a Cronet engine
118 | return;
119 | }
120 | if (task.getException() != null) {
121 | Exception cause = task.getException();
122 | if (cause instanceof GooglePlayServicesNotAvailableException) {
123 | Toast.makeText(context, "Google Play services not available.",
124 | Toast.LENGTH_SHORT).show();
125 | } else if (cause instanceof GooglePlayServicesRepairableException) {
126 | Toast.makeText(context, "Google Play services update is required.",
127 | Toast.LENGTH_SHORT).show();
128 | context.startActivity(((GooglePlayServicesRepairableException) cause)
129 | .getIntent());
130 | } else {
131 | Toast.makeText(context, "Unexpected error: " + cause,
132 | Toast.LENGTH_SHORT).show();
133 | }
134 | } else {
135 | Toast.makeText(context, "Unable to load Google Play services.",
136 | Toast.LENGTH_SHORT).show();
137 | }
138 | });
139 |
140 | // If the user wants to pick a Cronet implementation (from those available on the device)
141 | // manually, they can retrieve the list of all providers on the device and use them to
142 | // create a CronetEngine directly. Make sure to check if the providers are enabled,
143 | // otherwise you might run into compatibility issues further down.
144 | List enabledProviders =
145 | CronetProvider.getAllProviders(context)
146 | .stream()
147 | .filter(CronetProvider::isEnabled)
148 | .collect(Collectors.toList());
149 |
150 | if (enabledProviders.isEmpty()) {
151 | Toast.makeText(context, "No enabled Cronet providers!", Toast.LENGTH_SHORT).show();
152 | return;
153 | }
154 |
155 | // Typically, the application would decide based on the name and version. We just pick
156 | // a random one.
157 | Collections.shuffle(enabledProviders);
158 | CronetProvider winner = enabledProviders.get(0);
159 | Toast.makeText(context, "And the winning Cronet implementation is " + winner.getName() +
160 | ", version " + winner.getVersion(),
161 | Toast.LENGTH_SHORT).show();
162 |
163 | // Then, one can use the provider to create a builder, and set it up as demonstrated
164 | // in createDefaultCronetEngine.
165 | winner.createBuilder().enableBrotli(true).build();
166 | }
167 | }
168 |
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