1. 创建一个空目录 RNDemo
2. 在RNDemo中创建一个子目录 android
3. 将android 项目拷贝到子目录 android 中,如下项目结构。
4. 在RNDemo中创建package.json文件添加如下内容:
{
"name": "MyReactNativeApp",
"version": "0.0.1",
"private": true,
"scripts": {
"start": "node node_modules/react-native/local-cli/cli.js start"
},
"dependencies": {
"react": "16.0.0-alpha.6",
"react-native": "0.44.3"
}
}
5.在RNDemo根目录下执行命令:
npm install
命令执行完会生成node_modules/目录,(所有通过npm install命令安装的模块都会放在这个目录中。这个目录我们原则上不复制、不移动、不修改、不上传,随用随装)。
6.在你的app中 build.gradle 文件中添加 React Native 依赖:
dependencies {
...
compile "com.facebook.react:react-native:+" // From node_modules.
}
7.在项目的 build.gradle 文件中为 React Native 添加一个 maven 依赖的入口,必须写在 “allprojects” 代码块中:
allprojects {
repositories {
...
maven {
// All of React Native (JS, Android binaries) is installed from npm
url "$rootDir/../node_modules/react-native/android"
}
}
...
}
//确保依赖路径的正确!以免在 Android Studio 运行Gradle同步构建时抛出 “Failed to resolve: com.facebook.react:react-native:0.x.x" 异常。
配置权限
接着,在 AndroidManifest.xml 清单文件中声明网络
<uses-permission android:name="android.permission.INTERNET" />
要访问 DevSettingsActivity 界面(即开发者菜单),则还需要在 AndroidManifest.xml 中声明:
<activity android:name="com.facebook.react.devsupport.DevSettingsActivity" />
开发者菜单一般仅用于在开发时从Packager服务器刷新JavaScript代码,所以在正式发布时你可以去掉这一权限。
代码集成
1.在RNDemo根目录创建index.js(在0.49版本之前是index.android.js文件)
2.添加代码:
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('MyReactNativeApp', () => HelloWorld);
3 . 配置权限以便开发中的红屏错误能正确显示
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
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (!Settings.canDrawOverlays(this)) {
Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
Uri.parse("package:" + getPackageName()));
startActivityForResult(intent, OVERLAY_PERMISSION_REQ_CODE);
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == OVERLAY_PERMISSION_REQ_CODE) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (!Settings.canDrawOverlays(this)) {
// SYSTEM_ALERT_WINDOW permission not granted...
}
}
}
}
4.
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MyReactNativeApp必须对应“index.android.js”中的
// “AppRegistry.registerComponent()”的第一个参数
mReactRootView.startReactApplication(mReactInstanceManager, "MyReactNativeApp", 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);
}
}
运行测试结果
npm start
react-native run-android