从API 19上的库中选择图像的空值 [英] null poiner on select image from gallery on API 19
本文介绍了从API 19上的库中选择图像的空值的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
在我的应用程序我只是选择一个图像从图库和图像的URI保存在Database.all这发生在片段。
清单文件：
<？xml version =1.0encoding =utf-8？>
< manifest xmlns：android =http://schemas.android.com/apk/res/android
package =com.example.sayres.myapplication7>
< uses-permission android：name =android.permission.MANAGE_DOCUMENTS/>
< application
android：name =。App
android：allowBackup =true
android：icon =@ mipmap / ic_launcher
android：label =@ string / app_name
android：supportsRtl =true
android：theme =@ style / AppTheme>
< activity android：name =。mvp.view.MainListActivity>
< intent-filter>
< action android：name =android.intent.action.MAIN/>
< category android：name =android.intent.category.LAUNCHER/>
< / intent-filter>
< / activity>
< activity android：name =。mvp.view.profile.ProfileActivity>< / activity>
< / application>
我的片段类： p>
package com.example.sayres.myapplication7.mvp.view.profile;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import com.example.sayres.myapplication7.App;
import com.example.sayres.myapplication7.R;
import com.example.sayres.myapplication7.entity.Contact;
import java.io.IOException;
import de.hdodenhof.circleimageview.CircleImageView;
/ **
*一个简单的{@link Fragment}子类。
* /
public class EditProfileFragment extends Fragment {
private EditFragmentCallBack editFragmentCallBack;
private EditText fragmentEditEditTextName;
private EditText fragmentEditEditTextFamily;
private EditText fragmentEditEditTextPhoneNumber;
private static final int SELECT_FILE = 0;
public static final String TAG =====;
private AlertDialog.Builder builder;
私人Uri selectedImageUri;
private CircleImageView fragmentEditPicture;
私人Bitmap bm;
private Button fragmentEditBtUpdate;
private int id;
private int rowUpdate;
private String name;
private String family;
private String phoneNumber;
私人联系人联系人
public EditProfileFragment（）{
//必需的空公共构造函数
}
@Override
public void onAttach Context context）{
super.onAttach（context）;
Log.d（TAG，onAttach：is running）;
editFragmentCallBack =（EditFragmentCallBack）context;
Log.d（TAG，onAttach：editFragmentCallBack已初始化）;
}
@Override
public View onCreateView（LayoutInflater inflater，ViewGroup容器，Bundle savedInstanceState）{
Log.d（TAG，onCreateView- EditFragment：正在运行）;
查看fragmentView = inflater.inflate（R.layout.fragment_edit_profile，container，false）;
initFragment（fragmentView）;
return fragmentView;
}
private void initFragment（查看父项）{
/ **
*引用fragment_edit_profile
* /
fragmentEditPicture =（CircleImageView）parent.findViewById（R.id.fragment_edit_picture）;
fragmentEditEditTextName =（EditText）parent.findViewById（R.id.fragment_edit_editText_name）;
fragmentEditEditTextFamily =（EditText）parent.findViewById（R.id.fragment_edit_editText_family）;
fragmentEditEditTextPhoneNumber =（EditText）parent.findViewById（R.id.fragment_edit_editText_phone）;
fragmentEditBtUpdate =（Button）parent.findViewById（R.id.fragment_edit_btn_save）;
fragmentEditBtUpdate.setOnClickListener（new View.OnClickListener（）{
@Override
public void onClick（View v）{
日志.d（TAG，onClick：yess）;
id = contact.get_id（）;
name = fragmentEditEditTextName.getText（）。toString（）;
family = fragmentEditEditTextFamily.getText ）.toString（）;
phoneNumber = fragmentEditEditTextPhoneNumber.getText（）。toString（）;
Log.d（TAG，onClick：name+ name）;
日志联系人（id，name，family，phoneNumber，selectedImageUri.toString（））;
rowUpdate = App.getInstanceImplementation（）。updateContact（contact）;
Log.i（==&;btnUpdateContact：+ rowUpdate）;
}
}）;
/ **
*通过CallBack通过ProfileActivity调用获取联系
* /
contact = editFragmentCallBack.getContact（）;
fragmentEditEditTextName.setText（contact.getName（））;
fragmentEditEditTextFamily.setText（contact.getFamily（））;
fragmentEditEditTextPhoneNumber.setText（contact.getPhonNumber（））;
}
public void selectImage（）{
final CharSequence [] items = {从库中选择，取消};
builder = new AlertDialog.Builder（getActivity（））;
builder.setTitle（添加照片）;
builder.setItems（items，new DialogInterface.OnClickListener（）{
@Override
public void onClick（DialogInterface dialog，int item）{
if（items [item] .equals （从库中选择））{
Intent intent = new Intent（）;
intent.setType（image / *）;
intent.setAction（Intent。 ACTION_GET_CONTENT）;
startActivityForResult（intent.createChooser（intent，Select File），SELECT_FILE）;
} else if（items [item] .equals （取消））{
}
}
}）;
builder.show（）;
}
@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）;
}
}
}
public void onSelectFromGalleryResult（意图数据）{
if（data！= null）{
bm = null;
try {
selectedImageUri = data.getData（）;
bm = MediaStore.Images.Media.getBitmap（getActivity（）。getContentResolver（），data.getData（））;
} catch（IOException e）{
e.printStackTrace（）;
}
Log.d（TAG，selectedImageUri+ selectedImageUri）;
位图photoBitMap = Bitmap.createScaledBitmap（bm，40，40，true）;
fragmentEditPicture.setImageBitmap（photoBitMap）;
}
}
public interface EditFragmentCallBack {
联系getContact（）;
void finishProfile（）;
}
}
异常： / p>
AndroidRuntime：FATAL EXCEPTION：main
进程：com.example.sayres.myapplication7，PID：17962
java.lang.RuntimeException：提交结果失败ResultInfo {who = null，request = 65536，result = -1，data = Intent {dat = file：/// storage / emulated / 0 / Download / 139137_（2560x1600）.JPG} }到activity {com.example.sayres.myapplication7 / com.example.sayres.myapplication7.mvp.view.profile.ProfileActivity}：java.lang.NullPointerException
在android.app.ActivityThread.deliverResults（ActivityThread.java ：3351）
at android.app.ActivityThread.handleSendResult（ActivityThread.jav a：3394）
at android.app.ActivityThread.access $ 1300（ActivityThread.java:135）
at android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1244）
at android.os.Handler.dispatchMessage（Handler.java:102）
在android.os.Looper.loop（Looper.java:136）
在android.app.ActivityThread.main（ActivityThread.java： 5001）
在java.lang.reflect.Method.invokeNative（Native Method）
在java.lang.reflect。 Method.invoke（Method.java:515）
at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:785）
at com.android.internal.os.ZygoteInit。 main（ZygoteInit.java:601）
at dalvik.system.NativeStart.main（Native Method）
引起的：java.lang.NullPointerException
at android.graphics.Bitmap.createScaledBitmap（Bitmap .java：590）
at com.example.sayres.myapplication7.mvp.view.profile.EditProfileFragment.onSelectFromGalleryResult（EditProfileFragment.java:196）
在com.example.sayres.myapplication7.mvp.view.profile.EditProfileFragment.onActivityResult（EditProfileFragment.java:171）
在android.support.v4.app.FragmentActivity.onActivityResult（FragmentActivity.java:176）
at android.app.Activity.dispatchActivityResult（Activity.java:5423）
at android.app.ActivityThread.deliverResults（ActivityThread.java:3347）
at android.app.ActivityThread.handleSendResult（ActivityThread .java：3394）
在android.app.ActivityThread.access $ 1300（ActivityThread.java:13 5）
在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1244）
在android.os.Handler.dispatchMessage（Handler.java:102）
在android.os .Looper.loop（Looper.java:136）
在android.app.ActivityThread.main（ActivityThread.java:5001）
在java.lang.reflect.Method.invokeNative（本机方法）
在java.lang.reflect.Method.invoke（Method.java:515）
在com.android.internal.os。 ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:785）
at com.android.internal.os.ZygoteInit.main（ZygoteInit.java:601）
at dalvik.system.NativeStart.main（Native Method ）
异常发生 onSelectFromGalleryResult（data）; 和位图photoBitMap = Bitmap.createScaledBitmap（bm，40，40，true）; line
解决方案
最后我通过这个链接
问题是因为Intent在API< 19和19中。
I'm very new in android. I don't know why I got this null pointer exception.I run my program on API 17 and it was performed without any problems but when I'm running on API 19 I got Null pointer Exception. in my app I just select an image from gallery and image's URI is saved in Database.all this happens in Fragment. manifest file:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.sayres.myapplication7">
<uses-permission android:name="android.permission.MANAGE_DOCUMENTS" />
<application
android:name=".App"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".mvp.view.MainListActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".mvp.view.profile.ProfileActivity"></activity>
</application>
my fragment class:
package com.example.sayres.myapplication7.mvp.view.profile;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import com.example.sayres.myapplication7.App;
import com.example.sayres.myapplication7.R;
import com.example.sayres.myapplication7.entity.Contact;
import java.io.IOException;
import de.hdodenhof.circleimageview.CircleImageView;
/**
* A simple {@link Fragment} subclass.
*/
public class EditProfileFragment extends Fragment {
private EditFragmentCallBack editFragmentCallBack;
private EditText fragmentEditEditTextName;
private EditText fragmentEditEditTextFamily;
private EditText fragmentEditEditTextPhoneNumber;
private static final int SELECT_FILE = 0;
public static final String TAG = "====>";
private AlertDialog.Builder builder;
private Uri selectedImageUri;
private CircleImageView fragmentEditPicture;
private Bitmap bm;
private Button fragmentEditBtUpdate;
private int id;
private int rowUpdate;
private String name;
private String family;
private String phoneNumber;
private Contact contact;
public EditProfileFragment() {
// Required empty public constructor
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
Log.d(TAG, "onAttach: is running");
editFragmentCallBack = (EditFragmentCallBack) context;
Log.d(TAG, "onAttach: editFragmentCallBack was initialized");
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
Log.d(TAG, "onCreateView- EditFragment: is running");
View fragmentView = inflater.inflate(R.layout.fragment_edit_profile, container, false);
initFragment(fragmentView);
return fragmentView;
}
private void initFragment(View parent) {
/**
* referencing of fragment_edit_profile
*/
fragmentEditPicture = (CircleImageView) parent.findViewById(R.id.fragment_edit_picture);
fragmentEditEditTextName = (EditText) parent.findViewById(R.id.fragment_edit_editText_name);
fragmentEditEditTextFamily = (EditText) parent.findViewById(R.id.fragment_edit_editText_family);
fragmentEditEditTextPhoneNumber = (EditText) parent.findViewById(R.id.fragment_edit_editText_phone);
fragmentEditBtUpdate = (Button) parent.findViewById(R.id.fragment_edit_btn_save);
fragmentEditBtUpdate.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d(TAG, "onClick: yess");
id = contact.get_id();
name = fragmentEditEditTextName.getText().toString();
family = fragmentEditEditTextFamily.getText().toString();
phoneNumber = fragmentEditEditTextPhoneNumber.getText().toString();
Log.d(TAG, "onClick: name " + name);
Log.d(TAG, "onClick: family " + family);
contact = new Contact(id, name, family, phoneNumber, selectedImageUri.toString());
rowUpdate = App.getInstanceImplementation().updateContact(contact);
Log.i("==>", "btnUpdateContact: " + rowUpdate);
}
});
/**
* get contact by invoke from CallBack on ProfileActivity
*/
contact = editFragmentCallBack.getContact();
fragmentEditEditTextName.setText(contact.getName());
fragmentEditEditTextFamily.setText(contact.getFamily());
fragmentEditEditTextPhoneNumber.setText(contact.getPhonNumber());
}
public void selectImage() {
final CharSequence[] items = {"Choose from Library", "Cancel"};
builder = new AlertDialog.Builder(getActivity());
builder.setTitle("Add Photo ");
builder.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
if (items[item].equals("Choose from Library")) {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(intent.createChooser(intent, "Select File"), SELECT_FILE);
} else if (items[item].equals("Cancel")) {
}
}
});
builder.show();
}
@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);
}
}
}
public void onSelectFromGalleryResult(Intent data) {
if (data != null) {
bm = null;
try {
selectedImageUri = data.getData();
bm = MediaStore.Images.Media.getBitmap(getActivity().getContentResolver(), data.getData());
} catch (IOException e) {
e.printStackTrace();
}
Log.d(TAG, "selectedImageUri " + selectedImageUri);
Bitmap photoBitMap = Bitmap.createScaledBitmap(bm, 40, 40, true);
fragmentEditPicture.setImageBitmap(photoBitMap);
}
}
public interface EditFragmentCallBack {
Contact getContact();
void finishProfile();
}
}
Exception:
AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.sayres.myapplication7, PID: 17962
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=65536, result=-1, data=Intent { dat=file:///storage/emulated/0/Download/139137_(2560x1600).JPG }} to activity {com.example.sayres.myapplication7/com.example.sayres.myapplication7.mvp.view.profile.ProfileActivity}: java.lang.NullPointerException
at android.app.ActivityThread.deliverResults(ActivityThread.java:3351)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3394)
at android.app.ActivityThread.access$1300(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1244)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:590)
at com.example.sayres.myapplication7.mvp.view.profile.EditProfileFragment.onSelectFromGalleryResult(EditProfileFragment.java:196)
at com.example.sayres.myapplication7.mvp.view.profile.EditProfileFragment.onActivityResult(EditProfileFragment.java:171)
at android.support.v4.app.FragmentActivity.onActivityResult(FragmentActivity.java:176)
at android.app.Activity.dispatchActivityResult(Activity.java:5423)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3347)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3394)
at android.app.ActivityThread.access$1300(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1244)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
the exception occur onSelectFromGalleryResult(data); and Bitmap photoBitMap = Bitmap.createScaledBitmap(bm, 40, 40, true);
line
解决方案
finally I fix this problem by this link
the problem was because of Intent in API<19 and >19.
这篇关于从API 19上的库中选择图像的空值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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