在我的应用程序中,它捕获了一些图像,当我点击一个按钮。当我第一次点击这个按钮后,相机意图打开之后,onActivityResult被应用程序调用,然后onResume方法被应用程序调用,每件事情都很好。但是当我第二次点击按钮时,应用程序会调用相机意图,但在应用程序调用onCreate方法之后,再调用onActivityResult方法。我不知道为什么onCreate方法被程序调用。正因为如此,我的程序出现了一些错误。Android:调用第二次onActivityResult抛出错误
代码(当按钮被点击的调用addPhoto法):
protected void addPhoto() {
System.out.println("*** addPhoto() ***");
Intent i = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
out1 = Environment.getExternalStorageDirectory(); // out1 is initialized as File out1 = null;
photoDateString = new DateClass().getCurrentDateAndTime();//this line give current date and time as photo name
out1 = new File(out, "xxx/images/" + photoDateString + ".jpg");
i.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(out1));
startActivityForResult(i, CAMERA_REQUEST);
System.out.println("*** End of addPhoto() ***");
}
码(onActivityResult):
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
System.out.println("*** onActivityResult() ***");
if (out1 != null && out1.exists()) {
// some code
}
//some code
System.out.println("*** End of onActivityResult() ***");
}
由于程序为线如果onActivityResult其抛出错误之前调用onCreate方法(out1!= null & & out1.exists()){
我不知道我需要做什么。
错误消息:
java.lang.RuntimeException: Unable to resume activity {com.pxxl.android.lxxxy/com.pxxl.android.lxxxy.FirstActivity}: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1888, result=-1, data=null} to activity {com.pxxl.android.lxxxy/com.pxxl.android.lxxxy.FirstActivity}: java.lang.NullPointerException
检查if(requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) – SKT