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ReactNativeHost.java
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ReactNativeHost.java
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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
package com.facebook.react;
import javax.annotation.Nullable;
import java.util.List;
import android.app.Application;
import com.facebook.infer.annotation.Assertions;
import com.facebook.react.common.LifecycleState;
import com.facebook.react.devsupport.RedBoxHandler;
import com.facebook.react.uimanager.UIImplementationProvider;
/**
* Simple class that holds an instance of {@link ReactInstanceManager}. This can be used in your
* {@link Application class} (see {@link ReactApplication}), or as a static field.
*/
public abstract class ReactNativeHost {
private final Application mApplication;
private @Nullable ReactInstanceManager mReactInstanceManager;
protected ReactNativeHost(Application application) {
mApplication = application;
}
/**
* Get the current {@link ReactInstanceManager} instance, or create one.
*/
public ReactInstanceManager getReactInstanceManager() {
if (mReactInstanceManager == null) {
mReactInstanceManager = createReactInstanceManager();
}
return mReactInstanceManager;
}
/**
* Get whether this holder contains a {@link ReactInstanceManager} instance, or not. I.e. if
* {@link #getReactInstanceManager()} has been called at least once since this object was created
* or {@link #clear()} was called.
*/
public boolean hasInstance() {
return mReactInstanceManager != null;
}
/**
* Destroy the current instance and release the internal reference to it, allowing it to be GCed.
*/
public void clear() {
if (mReactInstanceManager != null) {
mReactInstanceManager.destroy();
mReactInstanceManager = null;
}
}
protected ReactInstanceManager createReactInstanceManager() {
ReactInstanceManagerBuilder builder = ReactInstanceManager.builder()
.setApplication(mApplication)
.setJSMainModulePath(getJSMainModuleName())
.setUseDeveloperSupport(getUseDeveloperSupport())
.setRedBoxHandler(getRedBoxHandler())
.setUIImplementationProvider(getUIImplementationProvider())
.setInitialLifecycleState(LifecycleState.BEFORE_CREATE);
for (ReactPackage reactPackage : getPackages()) {
builder.addPackage(reactPackage);
}
String jsBundleFile = getJSBundleFile();
if (jsBundleFile != null) {
builder.setJSBundleFile(jsBundleFile);
} else {
builder.setBundleAssetName(Assertions.assertNotNull(getBundleAssetName()));
}
return builder.build();
}
/**
* Get the {@link RedBoxHandler} to send RedBox-related callbacks to.
*/
protected @Nullable RedBoxHandler getRedBoxHandler() {
return null;
}
protected final Application getApplication() {
return mApplication;
}
/**
* Get the {@link UIImplementationProvider} to use. Override this method if you want to use a
* custom UI implementation.
*
* Note: this is very advanced functionality, in 99% of cases you don't need to override this.
*/
protected UIImplementationProvider getUIImplementationProvider() {
return new UIImplementationProvider();
}
/**
* Returns the name of the main module. Determines the URL used to fetch the JS bundle
* from the packager server. It is only used when dev support is enabled.
* This is the first file to be executed once the {@link ReactInstanceManager} is created.
* e.g. "index.android"
*/
protected String getJSMainModuleName() {
return "index.android";
}
/**
* Returns a custom path of the bundle file. This is used in cases the bundle should be loaded
* from a custom path. By default it is loaded from Android assets, from a path specified
* by {@link getBundleAssetName}.
* e.g. "file://sdcard/myapp_cache/index.android.bundle"
*/
protected @Nullable String getJSBundleFile() {
return null;
}
/**
* Returns the name of the bundle in assets. If this is null, and no file path is specified for
* the bundle, the app will only work with {@code getUseDeveloperSupport} enabled and will
* always try to load the JS bundle from the packager server.
* e.g. "index.android.bundle"
*/
protected @Nullable String getBundleAssetName() {
return "index.android.bundle";
}
/**
* Returns whether dev mode should be enabled. This enables e.g. the dev menu.
*/
public abstract boolean getUseDeveloperSupport();
/**
* Returns a list of {@link ReactPackage} used by the app.
* You'll most likely want to return at least the {@code MainReactPackage}.
* If your app uses additional views or modules besides the default ones,
* you'll want to include more packages here.
*/
protected abstract List<ReactPackage> getPackages();
}