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升级 ReactNative 0.29 踩坑

ReactNative Android July 08 2016

今天看到 ReactNative 0.29 可以升级，就打算给我最近在写的 ReactNative-SuperID 也升级一下。

一升级后发现 Android 的 Sample 项目运行不了，出现下面的错误：

FATAL EXCEPTION: main Process: com.yourtion.superid_rn, PID: 8729 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.yourtion.superid_rn/com.yourtion.superid_rn.SuperIDRNActivity}: java.lang.ClassCastException: android.app.Application cannot be cast to com.facebook.react.ReactApplication    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)    at android.app.ActivityThread.access$800(ActivityThread.java:144)    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)    at android.os.Handler.dispatchMessage(Handler.java:102)    at android.os.Looper.loop(Looper.java:135)    at android.app.ActivityThread.main(ActivityThread.java:5221)    at java.lang.reflect.Method.invoke(Native Method)    at java.lang.reflect.Method.invoke(Method.java:372)    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) Caused by: java.lang.ClassCastException: android.app.Application cannot be cast to com.facebook.react.ReactApplication    at com.facebook.react.ReactActivity.getReactNativeHost(ReactActivity.java:79)    at com.facebook.react.ReactActivity.onCreate(ReactActivity.java:107)    at android.app.Activity.performCreate(Activity.java:5933)    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)     at android.app.ActivityThread.access$800(ActivityThread.java:144)     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)     at android.os.Handler.dispatchMessage(Handler.java:102)     at android.os.Looper.loop(Looper.java:135)     at android.app.ActivityThread.main(ActivityThread.java:5221)     at java.lang.reflect.Method.invoke(Native Method)     at java.lang.reflect.Method.invoke(Method.java:372)     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

原来，升级后需要对原有项目进行如下升级（参考： Releases 0.29.0 ）：

创建 MainApplication.java 并按照这个修改：

package <%= package %>;  import android.app.Application; import android.util.Log;  import com.facebook.react.ReactApplication; import com.facebook.react.ReactInstanceManager; import com.facebook.react.ReactNativeHost; import com.facebook.react.ReactPackage; import com.facebook.react.shell.MainReactPackage;  import java.util.Arrays; import java.util.List;  public class MainApplication extends Application implements ReactApplication {    private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {     @Override     protected boolean getUseDeveloperSupport() {       return BuildConfig.DEBUG;     }      @Override     protected List<ReactPackage> getPackages() {       return Arrays.<ReactPackage>asList(           new MainReactPackage()       );     }   };    @Override   public ReactNativeHost getReactNativeHost() {       return mReactNativeHost;   } }

按照这个更新 MainActivity.java ：

package <%= package %>;  import com.facebook.react.ReactActivity;  public class MainActivity extends ReactActivity {      /**      * Returns the name of the main component registered from JavaScript.      * This is used to schedule rendering of the component.      */     @Override     protected String getMainComponentName() {         return "<%= name %>";     } }

更新 AndroidManifest.xml 添加 android:name=".MainApplication" ：

<application +   android:name=".MainApplication"     android:allowBackup="true"     android:label="@string/app_name"     android:icon="@mipmap/ic_launcher"     android:theme="@style/AppTheme">

这样更新后，项目就可以正常运行啦～

原文 https://blog.yourtion.com/update-react-native-029-bug.html

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