React Native集成到现有Android Studio项目

开发环境准备

首先按照开发环境搭建教程来安装React Native在安卓平台上所需的一切依赖软件（比如

npm

）。

1. 打开现在Android项目

注意：react native支持最新sdk version 必须是16以上

2. 安装JavaScript依赖包

1. $ npm install

注意：安装的过程中可能会提示react版本不正确。（react-native对react的版本有严格要求，高于或低于某个范围都不可以。本文无法在这里列出所有react native和对应的react版本要求，只能提醒读者先尝试执行npm install，然后注意观察安装过程中的报错信息，例如

require react@x.y.z版本, but none was installed

，然后根据这样的提示，执行

npm
i -S react@x.y.z版本

。如果你使用多个第三方依赖，可能这些第三方各自要求的react版本有所冲突，此时应优先满足

react-native

所需要的

react

版本。）



react版本不对解决方法：

执行命令：

yarn add react@16.0.0-alpha.12

2. npm install --save react react-native

[/code]

注意：安装的过程中可能会forbidden 403

forbidden 403解决方法：

1.可能没设置npm镜像

yarn config set registry https://registry.npm.taobao.org --global
yarn config set disturl https://npm.taobao.org/dist --global

2.npm不是最新

查看当前版本 npm -v

查看最新版本号 npm info npm

安装最新 npm install npm@latest - g (@ 符号后面添加你查到的最新版本号)

3.  执行命令成功

把React Native添加到你的应用中

配置maven

在你的app中

build.gradle

文件中添加 React Native 依赖:

apply plugin: 'com.android.application'

android {
compileSdkVersion 25
buildToolsVersion "25.0.2"
defaultConfig {
applicationId "bluemoon.com.cn.reactnativeapp"
minSdkVersion 16
targetSdkVersion 25
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
ndk {
abiFilters "armeabi-v7a", "x86"
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
configurations.all {
resolutionStrategy.force 'com.google.code.findbugs:jsr305:1.3.9'
}
}

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
testCompile 'junit:junit:4.12'
compile "com.facebook.react:react-native:+" // From node_modules.
}

在项目的build.gradle添加maven依赖入口

buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.1.0'

// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}

allprojects {
repositories {
mavenLocal()
jcenter()
maven {
// All of React Native (JS, Android binaries) is installed from npm
url "$rootDir/node_modules/react-native/android"
}
}
}

task clean(type: Delete) {
delete rootProject.buildDir
}

修改package.json

{
"name": "reactnativeapp",
"version": "1.0.0",
"private": true,
"scripts": {
"start": "node node_modules/react-native/local-cli/cli.js start"
},
"dependencies": {
"react": "16.0.0-alpha.12",
"react-native": "^0.46.4"
}
}

编写MyReactActivity类

package bluemoon.com.cn.reactnativeapp;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.KeyEvent;

import com.facebook.react.ReactInstanceManager;
import com.facebook.react.ReactPackage;
import com.facebook.react.ReactRootView;
import com.facebook.react.bridge.JavaScriptModule;
import com.facebook.react.bridge.NativeModule;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.common.LifecycleState;
import com.facebook.react.modules.core.DefaultHardwareBackBtnHandler;
import com.facebook.react.shell.MainReactPackage;
import com.facebook.react.uimanager.ViewManager;

import java.util.List;

public class MyReactActivity extends Activity implements DefaultHardwareBackBtnHandler {
private ReactRootView mReactRootView;
private ReactInstanceManager mReactInstanceManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mReactRootView = new ReactRootView(this);
mReactInstanceManager = ReactInstanceManager.builder()
.setApplication(getApplication())
.setBundleAssetName("index.android.bundle")
.setJSMainModuleName("index.android")
.addPackage(new MainReactPackage())
.setUseDeveloperSupport(BuildConfig.DEBUG)
.setInitialLifecycleState(LifecycleState.RESUMED)
.build();
// 注意这里的HelloWorld必须对应“index.android.js”中的
// “AppRegistry.registerComponent()”的第一个参数
mReactRootView.startReactApplication(mReactInstanceManager, "reactnativeapp", null);
setContentView(mReactRootView);
}

@Override
public void invokeDefaultOnBackPressed() {
super.onBackPressed();
}

@Override
protected void onPause() {
super.onPause();

if (mReactInstanceManager != null) {
mReactInstanceManager.onHostPause(this);
}
}

@Override
protected void onResume() {
super.onResume();

if (mReactInstanceManager != null) {
mReactInstanceManager.onHostResume(this, this);
}
}

@Override
protected void onDestroy() {
super.onDestroy();

if (mReactInstanceManager != null) {
mReactInstanceManager.onHostDestroy();
}
}
@Override
public void onBackPressed() {
if (mReactInstanceManager != null) {
mReactInstanceManager.onBackPressed();
} else {
super.onBackPressed();
}
}
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_MENU && mReactInstanceManager != null) {
mReactInstanceManager.showDevOptionsDialog();
return true;
}
return super.onKeyUp(keyCode, event);
}
}

权限和声明

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="bluemoon.com.cn.reactnativeapp" >
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme" >
<activity android:name=".MainActivity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="com.facebook.react.devsupport.DevSettingsActivity" /><!--开发者菜单-->
<activity
android:name=".MyReactActivity"
android:label="@string/app_name"
android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
</application>

</manifest>

在根目录新建index.android.js，并添加react native组件

'use strict';

import React from 'react';
import {
AppRegistry,
StyleSheet,
Text,
View
} from 'react-native';

class HelloWorld extends React.Component {
render() {
return (
<View style={styles.container}>
<Text style={styles.hello}>Hello, World</Text>
</View>
)
}
}
var styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
},
hello: {
fontSize: 20,
textAlign: 'center',
margin: 10,
},
});

AppRegistry.registerComponent('reactnativeapp', () => HelloWorld);

修改MainActivity

如果你的应用会运行在Android 6.0（API level 23）或更高版本，请确保你在开发版本中有打开悬浮窗(overlay)权限

package bluemoon.com.cn.reactnativeapp;

import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.provider.Settings;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.txt_to_hello_world).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (!Settings.canDrawOverlays(MainActivity.this)) {
Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
Uri.parse("package:" + getPackageName()));
startActivityForResult(intent, 1);
return;
}
}
Intent i = new Intent(MainActivity.this, MyReactActivity.class);
startActivity(i);
}
});
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 1) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (!Settings.canDrawOverlays(this)) {
// SYSTEM_ALERT_WINDOW permission not granted...
Toast.makeText(this, "error", Toast.LENGTH_SHORT).show();
return;
}
}
}
Intent i = new Intent(MainActivity.this, MyReactActivity.class);
startActivity(i);
}
}

到这里就可以运行项目了！！！

还是有一点注意的是添加ndk，不然运行项目时会报错：

java.lang.UnsatisfiedLinkError: dlopen failed: "/data/data/bluemoon.com.cn.reactnativeapp/lib-main/libgnustl_shared.so" is 32-bit instead of 64-bit

app中 build.gradle 文件中添加

ndk {
abiFilters "armeabi-v7a", "x86"
}

gradle.properties文件添加：

android.useDeprecatedNdk=true

最终集成运行结果如下：

打包APK

设置gradle变量生产签名密钥

$ keytool -genkey -v -keystore my-release-key.keystore -alias my-key-alias -keyalg RSA -keysize 2048 -validity 10000

设置gradle变量

signingConfigs {
release {
storeFile file('./my-release-key.keystore')
storePassword "123456"
keyAlias "my-key-alias"
keyPassword "123456"
}
}

buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
signingConfig signingConfigs.release
}
}

生成离线的jsbundle文件

$ react-native bundle --platform android --dev false --entry-file index.android.js --bundle-output android/com/your-company-name/app-package-name/src/main/assets/index.android.bundle --assets-dest android/com/your-company-name/app-package-name/src/main/res/

生成发行APK包

gradle assembleRelease