我正在尝试将从Intent收到的Image复制到另一个目录。但我还是无法让它运转起来。需要帮助。
我的Logcat：
04-29 14:56:22.778 31620-31620/com.example.krupal.sqlitetest I/Choreographer: Skipped 42 frames! The application may be doing too much work on its main thread.
04-29 14:56:24.944 31620-31633/com.example.krupal.sqlitetest W/EGL_emulation: eglSurfaceAttrib not implemented
04-29 14:56:24.944 31620-31633/com.example.krupal.sqlitetest W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0x7f5170636740, error=EGL_SUCCESS
04-29 14:56:26.370 31620-31633/com.example.krupal.sqlitetest E/Surface: getSlotFromBufferLocked: unknown buffer: 0x7f517631a550
04-29 14:56:26.381 31620-31620/com.example.krupal.sqlitetest W/InputEventReceiver: Attempted to finish an input event but the input event receiver has already been disposed.
04-29 14:56:26.381 31620-31620/com.example.krupal.sqlitetest W/ViewRootImpl: Dropping event due to root view being removed: MotionEvent { action=ACTION_HOVER_ENTER, actionButton=0, id[0]=0, x[0]=322.27295, y[0]=447.5, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=4168947, downTime=4168760, deviceId=0, source=0x1002 }
04-29 14:56:26.381 31620-31620/com.example.krupal.sqlitetest W/InputEventReceiver: Attempted to finish an input event but the input event receiver has already been disposed.
04-29 14:56:26.381 31620-31620/com.example.krupal.sqlitetest W/ViewRootImpl: Dropping event due to root view being removed: MotionEvent { action=ACTION_HOVER_ENTER, actionButton=0, id[0]=0, x[0]=322.27295, y[0]=447.5, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=4168947, downTime=4168760, deviceId=0, source=0x1002 }
04-29 14:56:26.381 31620-31620/com.example.krupal.sqlitetest W/InputEventReceiver: Attempted to finish an input event but the input event receiver has already been disposed.
04-29 14:56:26.381 31620-31620/com.example.krupal.sqlitetest W/ViewRootImpl: Dropping event due to root view being removed: MotionEvent { action=ACTION_HOVER_MOVE, actionButton=0, id[0]=0, x[0]=322.27295, y[0]=447.5, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=4168947, downTime=4168760, deviceId=0, source=0x1002 }
04-29 14:56:26.381 31620-31620/com.example.krupal.sqlitetest W/InputEventReceiver: Attempted to finish an input event but the input event receiver has already been disposed.
04-29 14:56:27.652 31620-31633/com.example.krupal.sqlitetest E/Surface: getSlotFromBufferLocked: unknown buffer: 0x7f517631a710
04-29 14:56:29.935 31620-31630/com.example.krupal.sqlitetest I/art: Background sticky concurrent mark sweep GC freed 7247(862KB) AllocSpace objects, 0(0B) LOS objects, 0% free, 10MB/10MB, paused 10.778ms total 53.218ms
04-29 14:56:30.051 31620-31620/com.example.krupal.sqlitetest D/BuildVersion: Build version >=19
04-29 14:56:30.070 31620-31620/com.example.krupal.sqlitetest D/AndroidRuntime: Shutting down VM
--------- beginning of crash
04-29 14:56:30.071 31620-31620/com.example.krupal.sqlitetest E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.krupal.sqlitetest, PID: 31620
** java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { dat=content://com.android.externalstorage.documents/document/primary:Download/2015-09-09.jpg flg=0x1 }} to activity {com.example.krupal.sqlitetest/com.example.krupal.sqlitetest.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'char[] java.lang.String.toCharArray()' on a null object reference **
at android.app.ActivityThread.deliverResults(ActivityThread.java:3699)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3742)
at android.app.ActivityThread.-wrap16(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'char[] java.lang.String.toCharArray()' on a null object reference
at java.io.File.fixSlashes(File.java:183)
at java.io.File.<init>(File.java:130)
at com.example.krupal.sqlitetest.MainActivity.onActivityResult(MainActivity.java:160)
at android.app.Activity.dispatchActivityResult(Activity.java:6428)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3695)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3742)
at android.app.ActivityThread.-wrap16(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
04-29 14:56:32.316 31620-31620/com.example.krupal.sqlitetest I/Process: Sending signal. PID: 31620 SIG: 9
来源：
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
switch (requestCode) {
case SELECT_PICTURE: {
Uri selectedImageURI = data.getData();
if (Build.VERSION.SDK_INT < 19) {
String selectedImagePath = getPath(selectedImageURI);
Bitmap bitmap = BitmapFactory.decodeFile(selectedImagePath);
avatar.setImageBitmap(bitmap);
copyImageToInternalStorage(new File(getPath(selectedImageURI)));
Log.d("BuildVersion","Build version <19");
} else {
ParcelFileDescriptor parcelFileDescriptor;
try {
parcelFileDescriptor = getContentResolver().openFileDescriptor(selectedImageURI, "r");
FileDescriptor fileDescriptor = null;
if (parcelFileDescriptor != null) {
fileDescriptor = parcelFileDescriptor.getFileDescriptor();
}
Bitmap image = BitmapFactory.decodeFileDescriptor(fileDescriptor);
avatar.setImageBitmap(image);
Log.d("BuildVersion","Build version >=19");
copyImageToInternalStorage(new File(getPath(selectedImageURI)));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
break;
}
(everything else)
}
复制方法：
private void copyImageToInternalStorage(File sourcefile) {
String timeStamp = new SimpleDateFormat("ddMMyyyy_HHmmss").format(new Date());
File folder = getExternalFilesDir("ImageDatabase");
File file = new File(folder, "IMG_"+timeStamp+".jpg");
if(!sourcefile.exists()){
return;
}
FileChannel source = null;
FileChannel dest = null;
try {
source = new FileInputStream(sourcefile).getChannel();
dest = new FileOutputStream(file).getChannel();
if(source != null && dest != null){
dest.transferFrom(source,0,source.size());
}
if(source != null){
source.close();
}
if(dest != null){
dest.close();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
GetPath方法：
public String getPath(Uri uri) {
String[] projection = {MediaStore.Images.Media.DATA};
// Cursor cursor=managedQuery(uri, projection, null, null, null);
@SuppressWarnings("deprecation")
Cursor cursor = managedQuery(uri, projection, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
但是这给了我NullPointerException。需要改变什么？
答案 0 :(得分：1)
这是我用来在点击图片后复制文件的工作代码。你必须先为它创建一个目录结构。
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
switch (requestCode) {
case CLICK_PHOTO:
imageUri = data.getData();
path = Utils.getRealPathFromURI(Photos.this, imageUri);
picturePath = path.toString();
fileName = picturePath.substring(picturePath.lastIndexOf("/") + 1);
mFile = new File(Utils.getPath(getDIR), fileName);
try {
copyFile(new File(picturePath), mFile);
} catch (IOException e) {
e.printStackTrace();
}
saveBitmapToFile(mFile);
PhotoBeans bean = new PhotoBeans();
bean.setThumbImageUrl(mFile.getAbsolutePath());
bean.setIsImageSelected(false);
arrayListPhoto.add(bean);
adapter.notifyDataSetChanged(); // This will try to load your new Image
gvImages.invalidateViews(); // then you are refreshing views and setting the adapter again below
gvImages.setAdapter(adapter);
//Initialize Adapter
break;
case SELECT_PHOTO:
imageUri = data.getData();
path = Utils.getRealPathFromURI(Photos.this, imageUri);
picturePath = path.toString();
fileName = picturePath.substring(picturePath.lastIndexOf("/") + 1);
mFile = new File(Utils.getPath(getDIR), fileName);
try {
copyFile(new File(picturePath), mFile);
} catch (IOException e) {
e.printStackTrace();
}
saveBitmapToFile(mFile);
PhotoBeans beans = new PhotoBeans();
beans.setThumbImageUrl(mFile.getAbsolutePath());
beans.setIsImageSelected(false);
arrayListPhoto.add(beans);
adapter.notifyDataSetChanged(); // This will try to load your new Image
gvImages.invalidateViews(); // then you are refreshing views and setting the adapter again below
gvImages.setAdapter(adapter);
//Initialize Adapter
break;
}
}
}
的CopyFile（）
private void copyFile(File sourceFile, File destFile) throws IOException {
//Creates a copy of the existing file
if (!sourceFile.exists()) {
return;
}
FileChannel source = null;
FileChannel destination = null;
source = new FileInputStream(sourceFile).getChannel();
destination = new FileOutputStream(destFile).getChannel();
if (destination != null && source != null) {
destination.transferFrom(source, 0, source.size());
}
if (source != null) {
source.close();
}
if (destination != null) {
destination.close();
}
}
目录结构
private void createDirectoryStructure() {
try {
createDirectory(Environment.getExternalStorageDirectory() + "", "YourDirecrtoryName");
createDirectory(Environment.getExternalStorageDirectory() + "/" + "YourDirecrtoryName", "FolderInsideDirectory");
} catch (Exception e) {
e.printStackTrace();
}
}
private void createDirectory(String filePath, String directoryName) {
try {
File mfile= new File(filePath, directoryName);
if (!mfile.exists()) {
mfile.mkdirs();
Log.e("In error", "createDirectory");
} else {
Log.e("In nottt error", "createDirectory");
}
} catch (Exception e) {
e.printStackTrace();
}
}
Utils.getPath（）
public static String getPath(String getDIR) {
String path = "";
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
path = Environment.getExternalStorageDirectory().getAbsolutePath();
}
if(getDIR.equalsIgnoreCase("images")) {
return path + "/YourDirectoryName/YourDirectoryName Images";
}else if(getDIR.equalsIgnoreCase("videos")){
return path + "/YourDirectoryName/YourDirectoryName Videos";
}else {
return path + "/YourDirectoryName/YourDirectoryName Documents";
}
}
从Uri获取图像的路径。
public static String getRealPathFromURI(Context context, Uri contentUri) {
Cursor cursor = null;
try {
String[] proj = {MediaStore.Images.Media.DATA};
cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
Log.e("Cursor", "" + cursor);
if (cursor != null) {
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
else {
return null;
}
} finally {
if (cursor != null) {
cursor.close();
}
}
}
希望这有助于：）