问题
I have one Activity MainActivity. It contains a ViewPager hosting a fragment FragmentPlaceHolder. This fragment has a RecyclerView.
Now, on a click of a particular view, say button, inside a RecyclerView item, I want to open a chrome custom tab in new Activity. Can anyone help me with this one ? I am expecting a step wise implemention of Chrome Custom tabs.
Thanks.
回答1:
So, I did it this way:
First of all, add this following dependency in build.gradle(app):
compile 'com.android.support:customtabs:23.1.1'
First create an activity WebviewActivity:
WebViewActivity.java
public class WebviewActivity extends AppCompatActivity {
public static final String EXTRA_URL = "extra.url";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_webview);
String url = getIntent().getStringExtra(EXTRA_URL);
WebView webView = (WebView)findViewById(R.id.webview);
webView.setWebViewClient(new WebViewClient());
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
setTitle(url);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
webView.loadUrl(url);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
// Respond to the action bar's Up/Home button
case android.R.id.home:
finish();
return true;
}
return super.onOptionsItemSelected(item);
}
}
Now, say on button click you want to open chrome custom tab and load www.google.com, so, do it as below:
public void onButtonClick(View view){
CustomTabsIntent customTabsIntent = new CustomTabsIntent.Builder().build();
CustomTabActivityHelper.openCustomTab(
this,// activity
customTabsIntent,
Uri.parse("http://www.google.com"),
new WebviewFallback()
);
}
activity_webview.xml
<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2015 Google Inc. All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<WebView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/webview"
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"
tools:context=".helpers.WebviewActivity" />
Then, simply craete the classes as below:
CustomTabActivityHelper.java
import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.support.customtabs.CustomTabsClient;
import android.support.customtabs.CustomTabsIntent;
import android.support.customtabs.CustomTabsServiceConnection;
import android.support.customtabs.CustomTabsSession;
import java.util.List;
/**
* This is a helper class to manage the connection to the Custom Tabs Service.
*/
public class CustomTabActivityHelper implements ServiceConnectionCallback {
private CustomTabsSession mCustomTabsSession;
private CustomTabsClient mClient;
private CustomTabsServiceConnection mConnection;
private ConnectionCallback mConnectionCallback;
/**
* Opens the URL on a Custom Tab if possible. Otherwise fallsback to opening it on a WebView.
*
* @param activity The host activity.
* @param customTabsIntent a CustomTabsIntent to be used if Custom Tabs is available.
* @param uri the Uri to be opened.
* @param fallback a CustomTabFallback to be used if Custom Tabs is not available.
*/
public static void openCustomTab(Activity activity,
CustomTabsIntent customTabsIntent,
Uri uri,
CustomTabFallback fallback) {
String packageName = CustomTabsHelper.getPackageNameToUse(activity);
//If we cant find a package name, it means theres no browser that supports
//Chrome Custom Tabs installed. So, we fallback to the webview
if (packageName == null) {
if (fallback != null) {
fallback.openUri(activity, uri);
}
} else {
customTabsIntent.intent.setPackage(packageName);
customTabsIntent.launchUrl(activity, uri);
}
}
/**
* Unbinds the Activity from the Custom Tabs Service.
*
* @param activity the activity that is connected to the service.
*/
public void unbindCustomTabsService(Activity activity) {
if (mConnection == null) return;
activity.unbindService(mConnection);
mClient = null;
mCustomTabsSession = null;
mConnection = null;
}
/**
* Creates or retrieves an exiting CustomTabsSession.
*
* @return a CustomTabsSession.
*/
public CustomTabsSession getSession() {
if (mClient == null) {
mCustomTabsSession = null;
} else if (mCustomTabsSession == null) {
mCustomTabsSession = mClient.newSession(null);
}
return mCustomTabsSession;
}
/**
* Register a Callback to be called when connected or disconnected from the Custom Tabs Service.
*
* @param connectionCallback
*/
public void setConnectionCallback(ConnectionCallback connectionCallback) {
this.mConnectionCallback = connectionCallback;
}
/**
* Binds the Activity to the Custom Tabs Service.
*
* @param activity the activity to be binded to the service.
*/
public void bindCustomTabsService(Activity activity) {
if (mClient != null) return;
String packageName = CustomTabsHelper.getPackageNameToUse(activity);
if (packageName == null) return;
mConnection = new ServiceConnection(this);
CustomTabsClient.bindCustomTabsService(activity, packageName, mConnection);
}
/**
* @return true if call to mayLaunchUrl was accepted.
* @see {@link CustomTabsSession#mayLaunchUrl(Uri, Bundle, List)}.
*/
public boolean mayLaunchUrl(Uri uri, Bundle extras, List<Bundle> otherLikelyBundles) {
if (mClient == null) return false;
CustomTabsSession session = getSession();
if (session == null) return false;
return session.mayLaunchUrl(uri, extras, otherLikelyBundles);
}
@Override
public void onServiceConnected(CustomTabsClient client) {
mClient = client;
mClient.warmup(0L);
if (mConnectionCallback != null) mConnectionCallback.onCustomTabsConnected();
}
@Override
public void onServiceDisconnected() {
mClient = null;
mCustomTabsSession = null;
if (mConnectionCallback != null) mConnectionCallback.onCustomTabsDisconnected();
}
/**
* A Callback for when the service is connected or disconnected. Use those callbacks to
* handle UI changes when the service is connected or disconnected.
*/
public interface ConnectionCallback {
/**
* Called when the service is connected.
*/
void onCustomTabsConnected();
/**
* Called when the service is disconnected.
*/
void onCustomTabsDisconnected();
}
/**
* To be used as a fallback to open the Uri when Custom Tabs is not available.
*/
public interface CustomTabFallback {
/**
* @param activity The Activity that wants to open the Uri.
* @param uri The uri to be opened by the fallback.
*/
void openUri(Activity activity, Uri uri);
}
}
CustomTabsHelper.java
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.net.Uri;
import android.text.TextUtils;
import android.util.Log;
import java.util.ArrayList;
import java.util.List;
/**
* Helper class for Custom Tabs.
*/
public class CustomTabsHelper {
private static final String TAG = "CustomTabsHelper";
static final String STABLE_PACKAGE = "com.android.chrome";
static final String BETA_PACKAGE = "com.chrome.beta";
static final String DEV_PACKAGE = "com.chrome.dev";
static final String LOCAL_PACKAGE = "com.google.android.apps.chrome";
private static final String EXTRA_CUSTOM_TABS_KEEP_ALIVE =
"android.support.customtabs.extra.KEEP_ALIVE";
private static final String ACTION_CUSTOM_TABS_CONNECTION =
"android.support.customtabs.action.CustomTabsService";
private static String sPackageNameToUse;
private CustomTabsHelper() {}
public static void addKeepAliveExtra(Context context, Intent intent) {
Intent keepAliveIntent = new Intent().setClassName(
context.getPackageName(), KeepAliveService.class.getCanonicalName());
intent.putExtra(EXTRA_CUSTOM_TABS_KEEP_ALIVE, keepAliveIntent);
}
/**
* Goes through all apps that handle VIEW intents and have a warmup service. Picks
* the one chosen by the user if there is one, otherwise makes a best effort to return a
* valid package name.
*
* This is <strong>not</strong> threadsafe.
*
* @param context {@link Context} to use for accessing {@link PackageManager}.
* @return The package name recommended to use for connecting to custom tabs related components.
*/
public static String getPackageNameToUse(Context context) {
if (sPackageNameToUse != null) return sPackageNameToUse;
PackageManager pm = context.getPackageManager();
// Get default VIEW intent handler.
Intent activityIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.example.com"));
ResolveInfo defaultViewHandlerInfo = pm.resolveActivity(activityIntent, 0);
String defaultViewHandlerPackageName = null;
if (defaultViewHandlerInfo != null) {
defaultViewHandlerPackageName = defaultViewHandlerInfo.activityInfo.packageName;
}
// Get all apps that can handle VIEW intents.
List<ResolveInfo> resolvedActivityList = pm.queryIntentActivities(activityIntent, 0);
List<String> packagesSupportingCustomTabs = new ArrayList<>();
for (ResolveInfo info : resolvedActivityList) {
Intent serviceIntent = new Intent();
serviceIntent.setAction(ACTION_CUSTOM_TABS_CONNECTION);
serviceIntent.setPackage(info.activityInfo.packageName);
if (pm.resolveService(serviceIntent, 0) != null) {
packagesSupportingCustomTabs.add(info.activityInfo.packageName);
}
}
// Now packagesSupportingCustomTabs contains all apps that can handle both VIEW intents
// and service calls.
if (packagesSupportingCustomTabs.isEmpty()) {
sPackageNameToUse = null;
} else if (packagesSupportingCustomTabs.size() == 1) {
sPackageNameToUse = packagesSupportingCustomTabs.get(0);
} else if (!TextUtils.isEmpty(defaultViewHandlerPackageName)
&& !hasSpecializedHandlerIntents(context, activityIntent)
&& packagesSupportingCustomTabs.contains(defaultViewHandlerPackageName)) {
sPackageNameToUse = defaultViewHandlerPackageName;
} else if (packagesSupportingCustomTabs.contains(STABLE_PACKAGE)) {
sPackageNameToUse = STABLE_PACKAGE;
} else if (packagesSupportingCustomTabs.contains(BETA_PACKAGE)) {
sPackageNameToUse = BETA_PACKAGE;
} else if (packagesSupportingCustomTabs.contains(DEV_PACKAGE)) {
sPackageNameToUse = DEV_PACKAGE;
} else if (packagesSupportingCustomTabs.contains(LOCAL_PACKAGE)) {
sPackageNameToUse = LOCAL_PACKAGE;
}
return sPackageNameToUse;
}
/**
* Used to check whether there is a specialized handler for a given intent.
* @param intent The intent to check with.
* @return Whether there is a specialized handler for the given intent.
*/
private static boolean hasSpecializedHandlerIntents(Context context, Intent intent) {
try {
PackageManager pm = context.getPackageManager();
List<ResolveInfo> handlers = pm.queryIntentActivities(
intent,
PackageManager.GET_RESOLVED_FILTER);
if (handlers == null || handlers.size() == 0) {
return false;
}
for (ResolveInfo resolveInfo : handlers) {
IntentFilter filter = resolveInfo.filter;
if (filter == null) continue;
if (filter.countDataAuthorities() == 0 || filter.countDataPaths() == 0) continue;
if (resolveInfo.activityInfo == null) continue;
return true;
}
} catch (RuntimeException e) {
Log.e(TAG, "Runtime exception while getting specialized handlers");
}
return false;
}
/**
* @return All possible chrome package names that provide custom tabs feature.
*/
public static String[] getPackages() {
return new String[]{"", STABLE_PACKAGE, BETA_PACKAGE, DEV_PACKAGE, LOCAL_PACKAGE};
}
}
ServiceConnection.java
import android.content.ComponentName;
import android.support.customtabs.CustomTabsClient;
import android.support.customtabs.CustomTabsServiceConnection;
import java.lang.ref.WeakReference;
/**
* Implementation for the CustomTabsServiceConnection that avoids leaking the
* ServiceConnectionCallback
*/
public class ServiceConnection extends CustomTabsServiceConnection {
// A weak reference to the ServiceConnectionCallback to avoid leaking it.
private WeakReference<ServiceConnectionCallback> mConnectionCallback;
public ServiceConnection(ServiceConnectionCallback connectionCallback) {
mConnectionCallback = new WeakReference<>(connectionCallback);
}
@Override
public void onCustomTabsServiceConnected(ComponentName name, CustomTabsClient client) {
ServiceConnectionCallback connectionCallback = mConnectionCallback.get();
if (connectionCallback != null) connectionCallback.onServiceConnected(client);
}
@Override
public void onServiceDisconnected(ComponentName name) {
ServiceConnectionCallback connectionCallback = mConnectionCallback.get();
if (connectionCallback != null) connectionCallback.onServiceDisconnected();
}
}
ServiceConnectionCallback.java
import android.support.customtabs.CustomTabsClient;
/**
* Callback for events when connecting and disconnecting from Custom Tabs Service.
*/
public interface ServiceConnectionCallback {
/**
* Called when the service is connected.
* @param client a CustomTabsClient
*/
void onServiceConnected(CustomTabsClient client);
/**
* Called when the service is disconnected.
*/
void onServiceDisconnected();
}
WebviewFallback.java
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
/**
* A Fallback that opens a Webview when Custom Tabs is not available
*/
public class WebviewFallback implements CustomTabActivityHelper.CustomTabFallback {
@Override
public void openUri(Activity activity, Uri uri) {
Intent intent = new Intent(activity, WebviewActivity.class);
intent.putExtra(WebviewActivity.EXTRA_URL, uri.toString());
activity.startActivity(intent);
}
}
By now, you should be able to open Chrome custom tab.
If found any issue with this, just let me know.
回答2:
add next string to tour code before WebSettings webSettings
webView.setWebViewClient(new WebViewClient());
来源：https://stackoverflow.com/questions/34328814/android-open-chrome-custom-tab-from-fragment