我有MainActivity,其中我拥有与相机相关的所有功能 . 当我从mainactivity调用相机打开功能时工作正常 . 但是当我通过适配器调用主活动相机功能时,它给出了以下错误: -
1-10 15:53:48.494 5741-5741 / user.com.test2 E / InputEventReceiver:异常调度输入事件 . 11-10 15:53:48.494 5741-5741 / user.com.test2 E / MessageQueue-JNI:MessageQueue回调中的异常:handleReceiveCallback 11-10 15:53:48.494 5741-5741 / user.com.test2 E / MessageQueue- JNI:java.lang.NullPointerException:尝试在android.app.Activity.startActivityForResult(Activity.java:3794)上的空对象引用上调用虚拟方法'android.app.ActivityThread $ ApplicationThread android.app.ActivityThread.getApplicationThread()' )在android.sapp.A活动中,android.support.Rartult(活动版.Ast.A活动,动作 . java:3755)at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:871)at user.com.hlthee.Reminders.galleryIntent(Reminders.java:1049)at user.com.hlthee.Reminders $ 24 . onClick(Reminders.java:1033)at com.android.internal.app.AlertController $ AlertParams $ 3.onItemClick(AlertCo) ntroller.java:1082)在android.widget.Ab上的android.widget.Adbster.performItemClick(AdapterView.java:305)android.widget.AbsListView $ AbsClickView.java上的android.widget.AbsListView.performItemClick(AbsListView.java:1146) :3072)android.widget.AbsListView.onTouchUp(AbsListView.java:3920)在android.widget.AbsListView.onTouchEvent(AbsListView.java:3657)android.view.View.dispatchTouchEvent(View.java:8476)at android .view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2400)位于android.view.View集团的android.view.View.ViewGroup上的android.view.View.ViewGroup.DispatchTransformedTouchEvent(ViewGroup.java:2406) . dispatchTouchEvent(ViewGroup.java:2107)位于android.view.View.St.EvatchTransformedTouchEvent(ViewGroup.java:2406)的android.view.ViewGroup上的android.view.ViewGroup.DispatchTransformedTouchEvent(ViewGroup.java:2407) :2406)在android.vie的android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2107)位于android.view.View.View.St.EvatchTventEvent(ViewGroup.java:2106)的android.view.View.St.EvatchTouchEvent(ViewGroup.java:2407)位于android.view.View . (ViewGroup.java:2107)com.android.internal.policy.impl.PhoneWindow $ DecorView.superDispatchTouchEvent(PhoneWindow.java:2372)com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1719) )android.view.Dialog.dispatchTouchEvent(Dialog.java:765)at com.android.internal.policy.impl.PhoneWindow $ DecorView.dispatchTouchEvent(PhoneWindow.java:2333)at android.view.View.dispatchPointerEvent(View . java:8671)at android.view.ViewRootImpl $ ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4171)at android.view.ViewRootImpl $ ViewPostImeInputStage.onProcess(ViewRootImpl.java:4037)at android.view.ViewRootImpl $ InputStage.deliver(ViewRootImpl) .java:3587)在android.view.ViewRootImpl $ InputStage.onDeliverToNext(查看RootImpl.java:3640)android.view.ViewRootImpl $ InputStage.forward(ViewRootImpl.java:3606)android.view.ViewRootImpl $ AsyncInputStage.forward(ViewRootImpl.java:3723)at android.view.ViewRootImpl $ InputStage.apply (ViewRootImpl.java:3614)android.view.ViewRootImpl $ AsyncInputStage.apply(ViewRootImpl.java:3780)在android.view.ViewRootImpl $ InputStage.deliver(ViewRootImpl.java:3587)的android.view.ViewRootImpl $ InputStage . onDeliverToNext(ViewRootImpl.java:3640)android.view.ViewRootImpl $ InputStage.forward(ViewRootImpl.java:3606)android.view.ViewRootImpl $ InputStage.apply(ViewRootImpl.java:3614)at android.view.ViewRootImpl $ InputStage .deliver(ViewRootImpl.java:3587)位于android.view.ViewRootImpl.dePotInputEvent(ViewRootImpl.java:5855)的android.view.ViewRootImpl.doProcessInputEvent(ViewRootImpl.java:5855),位于android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl . java:5800)在android.view.ViewRootImpl $ WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5945)at android.vi ew.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)在android.os.MessageQueue.nativePollOnce(Native Method)的android.os.MessageQueue.next(MessageQueue.java:143)atroi 11-10 15:53:48.494 5741 -5741 / user.com.test2 D / AndroidRuntime:关闭VM
从适配器调用: -
@Override
public void onBindViewHolder(final MedicineAdaptor.ViewHolder holder, final int position) {
holder.ReminderCardView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
Log.i("On Long Pressed","Yes");
//Toast.makeText(context,Integer.toString(listMedicine.getId()),Toast.LENGTH_LONG).show();
//Creating the instance of PopupMenu
final PopupMenu popupMenu=new
PopupMenu(context,holder.ReminderCardView);
//Inflating the Popup using xml file
popupMenu.getMenuInflater().inflate(R.menu.reminder_options,popupMenu.getMenu());
//registering popup with OnMenuItemClickListener
popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener(){
@Override
public boolean onMenuItemClick(MenuItem item) {
if (item.getTitle().equals("Edit Details"))
{
//Edit details
//((AddReminder)mactivity).openDialogToAddReminder();
Reminders reminders=new Reminders();
reminders.openDialogToAddReminder(context, dbHelper, listMedicine.getRemender_id(),listMedicine.getId());
update(listMedicine);
}
return false;
}
});
popupMenu.show(); //showing popup menu
return false;
}
});
}
MainActivity.java
public void cameraIntent(Context context)
{
Intent takingPictureCameraintent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
**if (takingPictureCameraintent.resolveActivity(getPackageManager())!=null)**
startActivityForResult(takingPictureCameraintent, REQUEST_CAMERA);
}
logcat在上面突出显示的行显示错误: -
Research done:- 从我能够弄清楚使用谷歌和stackoverfollow . 这是因为背景 .
所以我尝试了context.getPackageManager()
但通过这样做相机在mainActivity中不起作用也 .
编辑: -
Mainactivity.java
public void openDialogToAddReminder(final Context context, final DbHelper dbHelper, final int Rem_id, final int Med_id) {
LayoutInflater layoutInflaterAndroid = LayoutInflater.from(context);
final View mView = layoutInflaterAndroid.inflate(R.layout.add_reminders_dialog, null);
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(new ContextThemeWrapper(context, R.style.myDialog));
alertDialogBuilder.setView(mView);
captureImage = (ImageButton) mView.findViewById(R.id.capture_image);
captureImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
selectImage(context);
}
});
alertDialogBuilder
.setCancelable(false)
.setPositiveButton(dialog_title, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
})
.setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
AlertDialog alertDialog = alertDialogBuilder.create();
// show it
alertDialog.show();
}
public void selectImage(final Context context) {
final CharSequence[] items = { "Take Photo", "Choose from Gallery",
"Cancel" };
android.app.AlertDialog.Builder builder = new android.app.AlertDialog.Builder(context);
builder.setTitle("Add Photo");
builder.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
boolean result= Utility.checkPermission(context);
if (items[item].equals("Take Photo")) {
userChoosenTask ="Take Photo";
if(result)
cameraIntent(context);
} else if (items[item].equals("Choose from Gallery")) {
userChoosenTask ="Choose from Gallery";
if(result)
galleryIntent(context);
} else if (items[item].equals("Cancel")) {
dialog.dismiss();
}
}
});
builder.show();
}
public void galleryIntent(Context context)
{
Log.i("Context ",context.toString());
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);//
startActivityForResult(Intent.createChooser(intent, "Select File"),SELECT_FILE);
}
public void cameraIntent(Context context)
{
Intent takingPictureCameraintent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takingPictureCameraintent.resolveActivity(context.getPackageManager())!=null)
startActivityForResult(takingPictureCameraintent, REQUEST_CAMERA);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
if (requestCode == SELECT_FILE)
onSelectFromGalleryResult(data);
else if (requestCode == REQUEST_CAMERA)
onCaptureImageResult(data);
}
}
public void onCaptureImageResult(Intent data)
{
try{
Bundle extras=data.getExtras();
Bitmap thumbnail = (Bitmap) extras.get("data");
Log.i("Image Camera Bitmap ",thumbnail.toString());
ByteArrayOutputStream bytes=new ByteArrayOutputStream();
thumbnail.compress(Bitmap.CompressFormat.JPEG, 90,bytes);
captureImage.setImageBitmap(thumbnail);
saveToGallery(thumbnail);
}
catch (Exception e){e.printStackTrace();}
}
更新:-
public void cameraIntent(Context context)
{
Intent takingPictureCameraintent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (context.getClass().getSimpleName().equals("ListReminders"))
{
context.**startActivityForResult()** // bolded region is red color. means no fuction found.
}
else
{
if (takingPictureCameraintent.resolveActivity(context.getPackageManager())!=null)
startActivityForResult(takingPictureCameraintent, REQUEST_CAMERA);
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
if (requestCode == SELECT_FILE)
onSelectFromGalleryResult(data);
else if (requestCode == REQUEST_CAMERA)
onCaptureImageResult(data);
}
}
public void onCaptureImageResult(Intent data)
{
try{
Bundle extras=data.getExtras();
Bitmap thumbnail = (Bitmap) extras.get("data");
Log.i("Image Camera Bitmap ",thumbnail.toString());
ByteArrayOutputStream bytes=new ByteArrayOutputStream();
thumbnail.compress(Bitmap.CompressFormat.JPEG, 90,bytes);
**captureImage.setImageBitmap(thumbnail);** // getting nullpointerexception
saveToGallery(thumbnail);
}
catch (Exception e){e.printStackTrace();}
}
2 回答
试试这个 .
因为你从适配器类调用
cameraIntent
. 在这种方法中,startActivtyForResult()
是活动类的方法 . 当你从适配器调用时,你需要调用context.startActivtyForResult()
而不是调用startActivtyForResult()
.你可以通过在
openDialogToAddReminder
中添加callType
参数来实现它您是否已将相机权限插入
Manifest.xml
?