我有MainActivity中，我都关系到相机的功能。当我从mainactivity调用相机打开功能工作正常。但是当我通过适配器调用的主要活动拍照功能的它是给下面的错误： -
1-10 15：53：48.494 5741-5741 / user.com.test2 E / InputEventReceiver：异常分派输入事件。 11-10 15：53：48.494 5741-5741 / user.com.test2 E /的MessageQueue-JNI：异常中的MessageQueue回调：handleReceiveCallback 11-10 15：53：48.494 5741-5741 / user.com.test2 E / MessageQueue- JNI：显示java.lang.NullPointerException：尝试在上一个android.app.Activity.startActivityForResult空对象引用调用虚拟方法android.app.ActivityThread $ ApplicationThread android.app.ActivityThread.getApplicationThread（）'（Activity.java:3794 ）在android.support.v4.app.BaseFragmentActivityJB.startActivityForResult（BaseFragmentActivityJB.java:48）在android.support.v4.app.FragmentActivity.startActivityForResult（FragmentActivity.java:75）在android.app.Activity.startActivityForResult（活动。 Java的：3755）在android.support.v4.app.FragmentActivity.startActivityForResult（FragmentActivity.java:871）在user.com.hlthee.Reminders.galleryIntent（Reminders.java:1049）在user.com.hlthee.Reminders $ 24的onClick（Reminders.java:1033）在com.android.internal.app.AlertController $ AlertParams $ 3.onItemClick（AlertCo ntroller.java:1082）在android.widget.AdapterView.performItemClick（AdapterView.java:305）在android.widget.AbsListView.performItemClick（AbsListView.java:1146）在android.widget.AbsListView $ PerformClick.run（AbsListView.java ：3072）在android.widget.AbsListView.onTouchUp（AbsListView.java:3920）在android.widget.AbsListView.onTouchEvent（AbsListView.java:3657）在android.view.View.dispatchTouchEvent（View.java:8476）在机器人.view.ViewGroup.dispatchTransformedTouchEvent（ViewGroup.java:2400）在android.view.ViewGroup.dispatchTouchEvent（ViewGroup.java:2093）在android.view.ViewGroup.dispatchTransformedTouchEvent（ViewGroup.java:2406）在android.view.ViewGroup。 dispatchTouchEvent（ViewGroup.java:2107）在android.view.ViewGroup.dispatchTransformedTouchEvent（ViewGroup.java:2406）在android.view.ViewGroup.dispatchTouchEvent（ViewGroup.java:2107）在android.view.ViewGroup.dispatchTransformedTouchEvent（ViewGroup.java ：2406）在android.view.ViewGroup.dispatchTouchEvent（ViewGroup.java:2107）在android.vie w.ViewGroup.dispatchTransformedTouchEvent（ViewGroup.java:2406）在android.view.ViewGroup.dispatchTouchEvent（ViewGroup.java:2107）在android.view.ViewGroup.dispatchTransformedTouchEvent（ViewGroup.java:2406）在android.view.ViewGroup.dispatchTouchEvent （ViewGroup.java:2107）在com.android.internal.policy.impl.PhoneWindow $ DecorView.superDispatchTouchEvent（PhoneWindow.java:2372）在com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent（PhoneWindow.java:1719 ）在android.app.Dialog.dispatchTouchEvent（Dialog.java:765）在com.android.internal.policy.impl.PhoneWindow $ DecorView.dispatchTouchEvent（PhoneWindow.java:2333）在android.view.View.dispatchPointerEvent（查看。 Java的：8671）在android.view.ViewRootImpl $ ViewPostImeInputStage.processPointerEvent（ViewRootImpl.java:4171）在android.view.ViewRootImpl $ ViewPostImeInputStage.onProcess（ViewRootImpl.java:4037）在android.view.ViewRootImpl $ InputStage.deliver（ViewRootImpl的.java：3587）在android.view.ViewRootImpl $ InputStage.onDeliverToNext（查看RootImpl.java:3640）在android.view.ViewRootImpl $ InputStage.forward（ViewRootImpl.java:3606）在android.view.ViewRootImpl $ AsyncInputStage.forward（ViewRootImpl.java:3723）在android.view.ViewRootImpl $ InputStage.apply （ViewRootImpl.java:3614）在android.view.ViewRootImpl $ AsyncInputStage.apply（ViewRootImpl.java:3780）在android.view.ViewRootImpl $ InputStage.deliver（ViewRootImpl.java:3587）在android.view.ViewRootImpl $ InputStage。 onDeliverToNext（ViewRootImpl.java:3640）在android.view.ViewRootImpl $ InputStage.forward（ViewRootImpl.java:3606）在android.view.ViewRootImpl $ InputStage.apply（ViewRootImpl.java:3614）在android.view.ViewRootImpl $ InputStage .deliver（ViewRootImpl.java:3587）在android.view.ViewRootImpl.deliverInputEvent（ViewRootImpl.java:5855）在android.view.ViewRootImpl.doProcessInputEvents（ViewRootImpl.java:5829）在android.view.ViewRootImpl.enqueueInputEvent（ViewRootImpl。 Java的：5800）在android.view.ViewRootImpl $ WindowInputEventReceiver.onInputEvent（ViewRootImpl.java:5945）在android.vi ew.InputEventReceiver.dispatchInputEvent（InputEventReceiver.java:185）在android.os.MessageQueue.nativePollOnce（本机方法）在android.os.MessageQueue.next（MessageQueue.java:143）在androi 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;
}
});
}
main activity.Java
public void cameraIntent(Context context)
{
Intent takingPictureCameraintent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
**if (takingPictureCameraintent.resolveActivity(getPackageManager())!=null)**
startActivityForResult(takingPictureCameraintent, REQUEST_CAMERA);
}
logcat的显示错误在突出显示的行之上： -
研究完成： - 从我能想出使用谷歌和stackoverfollow。这是因为上下文。
所以我尝试context.getPackageManager（）
但正是这台相机是不是在mainActivity工作也。
编辑： -
main activity.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();}
}
给尝试这个。
既然你在呼唤从适配器类的cameraIntent。并且在该方法中startActivtyForResult()是活动类的方法。你需要调用context.startActivtyForResult()而不是调用startActivtyForResult()当你从适配器调用的。
您可以通过在callType加入openDialogToAddReminder参数实现它。
if(callType.equals("fromActivity"))
{
startActivtyForResult(....);
}
else
{
((Activity)context).startActivityForResult();
}
你有插入相机许可进入Manifest.xml？
<uses-permission android:name="android.permission.CAMERA"/>