$ npm init
$ npm install --save react react-native
$ curl -o .flowconfig https://raw.githubusercontent.com/facebook/react-native/master/.flowconfig

"start": "node node_modules/react-native/local-cli/cli.js start"

{
 "name": "react-example",
 "version": "1.0.0",
 "description": "this is my first react example",
 "main": "index.js",
 "scripts": {
  "test": "echo \"Error: no test specified\" && exit 1",
  "start": "node node_modules/react-native/local-cli/cli.js start"
 },
 "keywords": [
  "react",
  "android",
  "example"
 ],
 "author": "max",
 "license": "ISC",
 "dependencies": {
  "react": "^15.4.2",
  "react-native": "^0.42.3"
 }
}

'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('react-example', () => HelloWorld);

dependencies {
   ...
   compile "com.facebook.react:react-native:+" // From node_modules.
 }

android {
  configurations.all {
    resolutionStrategy.force 'com.google.code.findbugs:jsr305:1.3.9'
  }
}

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

url "$rootDir/../node_modules/react-native/android"
改为
url "$rootDir/node_modules/react-native/android"

<uses-permission android:name="android.permission.INTERNET" />

<activity android:name="com.facebook.react.devsupport.DevSettingsActivity" />

public class MyReactActivity extends AppCompatActivity 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react-example必须对应“index.android.js”中的
    // “AppRegistry.registerComponent()”的第一个参数
    mReactRootView.startReactApplication(mReactInstanceManager, "react-example", 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);
  }
}

<activity 
      android:name=".MyReactActivity"
      android:label="@string/app_name"
      android:theme="@style/Theme.AppCompat.Light.NoActionBar">
    </activity>

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...
      }
    }
  }
}

$ npm start

public class MainActivity extends AppCompatActivity {

  private static final int OVERLAY_PERMISSION_REQ_CODE = 0x1111;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    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);
      }
    }

    findViewById(R.id.text1).setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        Intent intent = new Intent(MainActivity.this, MyReactActivity.class);
        startActivity(intent);
      }
    });
  }

  @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...
        }
      }
    }
  }
}

mReactRootView = new ReactRootView(this);
mReactInstanceManager = ReactInstanceManager.builder()
    .setApplication(getApplication())
    .setBundleAssetName("index.android.bundle")
    .setJSMainModuleName("index.android")
    .addPackage(new MainReactPackage())
//        .setUseDeveloperSupport(BuildConfig.DEBUG) //开发者支持，BuildConfig.DEBUG的值默认是false，无法使用开发者菜单
    .setUseDeveloperSupport(true)        //开发者支持,开发的时候要设置为true，不然无法使用开发者菜单
    .setInitialLifecycleState(LifecycleState.RESUMED)
    .build();

// 注意这里的react-example必须对应“index.android.js”中的
// “AppRegistry.registerComponent()”的第一个参数
mReactRootView.startReactApplication(mReactInstanceManager, "peoplus", null);