在StackOverflow上看到它非常常见的问题,我在SO上尝试了几乎所有的解决方案。我仍然在NullPointerExeption
中获得onAtivityResult- data
。
我试过了:
http://developer.android.com/training/camera/photobasics.html
how to pass captured/gallery image to next activity in android
android camera: onActivityResult() intent is null if it had extras
我第四次尝试的最后一个代码如下:
按钮点击:
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
File file=getOutputMediaFile(1);
picUri = Uri.fromFile(file); // create
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, picUri); // set the image file
startActivityForResult(cameraIntent, REQUEST_TAKE_PHOTO);
getOutputMediaFile()
private File getOutputMediaFile(int type) {
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES), "MyApplication");
/**Create the storage directory if it does not exist*/
if (!mediaStorageDir.exists()) {
if (!mediaStorageDir.mkdirs()) {
return null;
}
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File mediaFile;
if (type == 1){
mediaFile = new File(mediaStorageDir.getPath() + File.separator +
"IMG_"+ timeStamp + ".png");
} else {
return null;
}
return mediaFile;
}
onActivityResult()
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
if (resultCode == RESULT_OK && requestCode == REQUEST_TAKE_PHOTO && intent != null){
Uri selectedImage = intent.getData();
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
//file path of captured image
imagepath = cursor.getString(columnIndex);
//file path of captured image
File f = new File(imagepath);
String filename = f.getName();
cursor.close();
Bitmap imageData = BitmapFactory.decodeFile(filename);
// Bitmap imageData = (Bitmap) data.getExtras().get("data");
Intent i = new Intent(this, EditImageActivity.class);
i.putExtra("path", imageData );
startActivity(i);
}
}
}
请提出一些更好的内容,这些内容在我之前已经提到过的链接中没有提及,因为这对我来说并不适用。
我正在使用Android Atudio, api 10 + 。
崩溃日志:
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: FATAL EXCEPTION: main
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: Process: com.example.dell.drawdemo, PID: 25060
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=null} to activity {com.example.dell.drawdemo/com.example.dell.drawdemo.MainActivity}: java.lang.NullPointerException
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at android.app.ActivityThread.deliverResults(ActivityThread.java:3593)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at android.app.ActivityThread.handleSendResult(ActivityThread.java:3636)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at android.app.ActivityThread.access$1300(ActivityThread.java:151)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1390)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:110)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at android.os.Looper.loop(Looper.java:193)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5334)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at java.lang.reflect.Method.invokeNative(Native Method)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:515)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:676)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at dalvik.system.NativeStart.main(Native Method)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: Caused by: java.lang.NullPointerException
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at com.example.dell.drawdemo.MainActivity.onActivityResult(MainActivity.java:131)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at android.app.Activity.dispatchActivityResult(Activity.java:5546)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at android.app.ActivityThread.deliverResults(ActivityThread.java:3589)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at android.app.ActivityThread.handleSendResult(ActivityThread.java:3636)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at android.app.ActivityThread.access$1300(ActivityThread.java:151)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1390)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:110)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at android.os.Looper.loop(Looper.java:193)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5334)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at java.lang.reflect.Method.invokeNative(Native Method)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:515)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:676)
10-12 17:48:49.934 25060-25060/com.example.dell.drawdemo E/AndroidRuntime: at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分:1)
嗨请尝试以下代码希望它能帮到你,
private final int CAMERA_CAPTURE_IMAGE_REQUEST_CODE = 100;
private final int MEDIA_TYPE_IMAGE = 1;
捕获图像的意图代码
Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
m_fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, m_fileUri);
startActivityForResult(intent, CAMERA_CAPTURE_IMAGE_REQUEST_CODE);
public Uri getOutputMediaFileUri(int p_type)
{
return Uri.fromFile(getOutputMediaFile(p_type));
}
private File getOutputMediaFile(int p_type)
{
File m_mediaFile;
if (p_type == MEDIA_TYPE_IMAGE)
{
m_buffer = new StringBuffer();
m_buffer.append(Environment.getExternalStorageDirectory().getPath() + File.separator).append("Image");
File m_imageStorageFile = new File(m_buffer.toString());
// Create the storage directory if it does not exist
if (!m_imageStorageFile.exists())
{
if (!m_imageStorageFile.mkdirs())
{
return null;
}
}
// Create a media file name
String m_timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.getDefault()).format(new java.util.Date());
m_buffer = new StringBuffer();
m_buffer.append(m_imageStorageFile.getPath()).append(File.separator).append("IMG_").append(m_timeStamp).append(".jpg");
m_mediaFile = new File(m_buffer.toString());
}
else
{
return null;
}
return m_mediaFile;
}
在onActivityResult
中写下以下代码protected void onActivityResult(int p_requestCode, int p_resultCode, Intent p_data)
{
super.onActivityResult(p_requestCode, p_resultCode, p_data);
if (p_resultCode == RESULT_OK)
{
switch (p_requestCode)
{
case CAMERA_CAPTURE_IMAGE_REQUEST_CODE:
m_selectedPath = m_fileUri.getPath();
break;
}
}
}
Constant.MEDIA_DIRECTORY_PATH包含您的目录路径 示例: - mnt / sdcard0 / android / com.example
答案 1 :(得分:0)
您正在获得NullPointerException
,因为当用户进入相机意图时,当他捕获图像时,托管相机意图的活动会在用户从相机意图返回时被销毁或重新创建。 picUri
(从相机意图创建的图像路径)返回null
的duw,因为现在没有这样的对象存在于内存中。
保存图像路径:
@Override
protected void onSaveInstanceState(Bundle savedInstanceState) {
if(mImageCaptureUri!=null)
savedInstanceState.putString("camera_image", picUri.toString());
super.onSaveInstanceState(savedInstanceState);
}
从中检索图像路径:
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
if (savedInstanceState != null) {
if (savedInstanceState.containsKey("camera_image")) {
picUri = Uri.parse(savedInstanceState.getString("camera_image"));
}
}
super.onRestoreInstanceState(savedInstanceState);
}
引用已经回答question。