获取外部缓存目录可能导致应用崩溃

[ruankao-mengxin]

`
private File getOutputMediaFile(String ext) {
ext = ext != null ? ext : "jpg";
File mediaStorageDir = getCurrentActivity().getExternalCacheDir();
if (mediaStorageDir == null) {
mediaStorageDir = getCurrentActivity().getCacheDir();
}
if (mediaStorageDir == null || (!mediaStorageDir.exists() && !mediaStorageDir.mkdirs())) {
return null;
}
String timeStamp = new SimpleDateFormat("ddMMyyyy_HHmm").format(new Date());
File mediaFile;
String mImageName = "RN_" + timeStamp + "." + ext;
mediaFile = new File(mediaStorageDir.getPath() + File.separator + mImageName);
Log.d("path is", mediaFile.getPath());
return mediaFile;
}

`

`
FATAL EXCEPTION: mqt_native_modules
(link to log)
03-10 12:49:00.577 2919 3008 E AndroidRuntime: FATAL EXCEPTION: mqt_native_modules
03-10 12:49:00.577 2919 3008 E AndroidRuntime: Process: com.doquestion, PID: 2919
03-10 12:49:00.577 2919 3008 E AndroidRuntime: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.io.File.exists()' on a null object reference
03-10 12:49:00.577 2919 3008 E AndroidRuntime: at me.vanpan.rctqqsdk.QQSDK.getOutputMediaFile(QQSDK.java:702)
03-10 12:49:00.577 2919 3008 E AndroidRuntime: at me.vanpan.rctqqsdk.QQSDK.getOutputMediaFile(QQSDK.java:696)
03-10 12:49:00.577 2919 3008 E AndroidRuntime: at me.vanpan.rctqqsdk.QQSDK.saveBitmapToFile(QQSDK.java:643)
03-10 12:49:00.577 2919 3008 E AndroidRuntime: at me.vanpan.rctqqsdk.QQSDK.processImage(QQSDK.java:512)
03-10 12:49:00.577 2919 3008 E AndroidRuntime: at me.vanpan.rctqqsdk.QQSDK.shareImage(QQSDK.java:224)
03-10 12:49:00.577 2919 3008 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
03-10 12:49:00.577 2919 3008 E AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:372)
03-10 12:49:00.577 2919 3008 E AndroidRuntime: at com.facebook.react.bridge.JavaMethodWrapper.invoke(JavaMethodWrapper.java:374)
03-10 12:49:00.577 2919 3008 E AndroidRuntime: at com.facebook.react.bridge.JavaModuleWrapper.invoke(JavaModuleWrapper.java:162)
03-10 12:49:00.577 2919 3008 E AndroidRuntime: at com.facebook.react.bridge.queue.NativeRunnable.run(Native Method)
03-10 12:49:00.577 2919 3008 E AndroidRuntime: at android.os.Handler.handleCallback(Handler.java:739)
03-10 12:49:00.577 2919 3008 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:95)
03-10 12:49:00.577 2919 3008 E AndroidRuntime: at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:31)
03-10 12:49:00.577 2919 3008 E AndroidRuntime: at android.os.Looper.loop(Looper.java:135)
03-10 12:49:00.577 2919 3008 E AndroidRuntime: at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run(MessageQueueThreadImpl.java:194)
03-10 12:49:00.577 2919 3008 E AndroidRuntime: at java.lang.Thread.run(Thread.java:818)

`

这是我修改后的获取缓存的方法，老的方法在某些没有外存的手机上可能导致CARSH