[英]Camera crashes after taking photo in emulator
我正在开发一个通过Intent
将用户带到相机的应用程序。 我一直在研究记事本演示的代码。 当我拍照并确认时会出现问题。 该应用程序崩溃了,logcat给了我这个:
04-10 20:18:29.896: D/gralloc_goldfish(6154): Emulator without GPU emulation detected.
04-10 20:18:35.897: I/Choreographer(6154): Skipped 282 frames! The application may be doing too much work on its main thread.
04-10 20:18:42.977: W/IInputConnectionWrapper(6154): showStatusIcon on inactive InputConnection
04-10 20:18:44.007: I/Choreographer(6154): Skipped 344 frames! The application may be doing too much work on its main thread.
04-10 20:18:45.456: D/AndroidRuntime(6154): Shutting down VM
04-10 20:18:45.456: W/dalvikvm(6154): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-10 20:18:45.516: E/AndroidRuntime(6154): FATAL EXCEPTION: main
04-10 20:18:45.516: E/AndroidRuntime(6154): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=100, result=-1, data=null} to activity {com.android.demo.notepad3/com.android.demo.notepad3.Notepadv3}: java.lang.NullPointerException
04-10 20:18:45.516: E/AndroidRuntime(6154): at android.app.ActivityThread.deliverResults(ActivityThread.java:3319)
04-10 20:18:45.516: E/AndroidRuntime(6154): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3362)
04-10 20:18:45.516: E/AndroidRuntime(6154): at android.app.ActivityThread.access$1100(ActivityThread.java:141)
04-10 20:18:45.516: E/AndroidRuntime(6154): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1282)
04-10 20:18:45.516: E/AndroidRuntime(6154): at android.os.Handler.dispatchMessage(Handler.java:99)
04-10 20:18:45.516: E/AndroidRuntime(6154): at android.os.Looper.loop(Looper.java:137)
04-10 20:18:45.516: E/AndroidRuntime(6154): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-10 20:18:45.516: E/AndroidRuntime(6154): at java.lang.reflect.Method.invokeNative(Native Method)
04-10 20:18:45.516: E/AndroidRuntime(6154): at java.lang.reflect.Method.invoke(Method.java:511)
04-10 20:18:45.516: E/AndroidRuntime(6154): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-10 20:18:45.516: E/AndroidRuntime(6154): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-10 20:18:45.516: E/AndroidRuntime(6154): at dalvik.system.NativeStart.main(Native Method)
04-10 20:18:45.516: E/AndroidRuntime(6154): Caused by: java.lang.NullPointerException
04-10 20:18:45.516: E/AndroidRuntime(6154): at com.android.demo.notepad3.Notepadv3.onActivityResult(Notepadv3.java:205)
04-10 20:18:45.516: E/AndroidRuntime(6154): at android.app.Activity.dispatchActivityResult(Activity.java:5293)
04-10 20:18:45.516: E/AndroidRuntime(6154): at android.app.ActivityThread.deliverResults(ActivityThread.java:3315)
04-10 20:18:45.516: E/AndroidRuntime(6154): ... 11 more
我目前唯一的线索是它与我配置onActivityResult
或将代码保存图像文件的位置有关。 现在,我将所有这些都集中在一项活动中:
public void takePhoto (View view) {
// create Intent to take a picture and return control to the calling application
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE); // create a file to save the image
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri); // set the image file name
// start the image capture Intent
startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
}
private static File getOutputMediaFile(int type){
// To be safe, you should check that the SDCard is mounted
// using Environment.getExternalStorageState() before doing this.
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES), "Notepadv3");
// This location works best if you want the created images to be shared
// between applications and persist after your app has been uninstalled.
// Create the storage directory if it does not exist
if (! mediaStorageDir.exists()){
if (! mediaStorageDir.mkdirs()){
Log.d("Notepadv3", "failed to create directory");
return null;
}
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date(type));
File mediaFile;
if (type == MEDIA_TYPE_IMAGE){
mediaFile = new File(mediaStorageDir.getPath() + File.separator +
"IMG_"+ timeStamp + ".jpg");
} else if(type == MEDIA_TYPE_VIDEO) {
mediaFile = new File(mediaStorageDir.getPath() + File.separator +
"VID_"+ timeStamp + ".mp4");
} else {
return null;
}
return mediaFile;
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {
if (resultCode == RESULT_OK) {
// Image captured and saved to fileUri specified in the Intent
Toast.makeText(this, "Image saved to:\n" +
data.getData(), Toast.LENGTH_LONG).show();
} else if (resultCode == RESULT_CANCELED) {
// User cancelled the image capture
} else {
// Image capture failed, advise user
}
}
}
在使用意图发布的Toast数据之前,应测试它是否不为null
if (data!=null){
Toast.makeText(this, "Image saved to:\n" +
data.getData(), Toast.LENGTH_LONG).show();
}
在您的情况下,您的活动返回null,可以在此行的logcat中看到
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=100,
result=-1, **data=null**} to activity
{com.android.demo.notepad3/com.android.demo.notepad3.Notepadv3}:
java.lang.NullPointerException
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