我正在制作一个应用程序，该应用程序调用内置摄像头来单击图像并将其上传到Firebase Firestore。但是单击2张或更多张照片后，该应用程序崩溃了。我正在使用一个名为MainActivity.java的导航抽屉，并且有一个片段提供一些按钮。在片段中有一个列表视图。
MainActivity.java
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener,OnFragmentInteractionListener{
private StorageReference mStorageRef;
AlertDialog.Builder builder;
LayoutInflater inflater;
View vv;
private AlertDialog dialog;
FirebaseFirestore db = FirebaseFirestore.getInstance();
@Override
public void onFragmentInteraction(Uri uri){
}
@Override
protected void onCreate(Bundle savedInstanceState) {
//uploadImage.doInBackground("ABCD");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
builder = new AlertDialog.Builder(MainActivity.this);
builder.setCancelable(false);
inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
vv = inflater.inflate(R.layout.layout_logging_in_dialog,null);
builder.setView(vv);
dialog = builder.create();
mStorageRef = FirebaseStorage.getInstance().getReference();
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
Fragment fragment = new TakeAttendance();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content,fragment).commit();
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
Fragment fragment = null;
Class fragmentClass;
int id = item.getItemId();
if (id == R.id.take_attendance) {
fragment = new TakeAttendance();
} else if (id == R.id.nav_gallery) {
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} else if (id == R.id.account_settings) {
fragment = new AccountSettings();
} else if (id == R.id.logout) {
fragment = new TakeAttendance();
FirebaseAuth mAuth = FirebaseAuth.getInstance();
mAuth.signOut();
Intent intent = new Intent(MainActivity.this,LoginActivity.class);
startActivity(intent);
finish();
}
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content,fragment).commit();
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
public void onActivityResult(int requestCode, int resultCode, Intent data){
super.onActivityResult(requestCode,resultCode,data);
Log.d("myMSG","cammmeeee22");
if(requestCode == 100 && resultCode == RESULT_OK){
Bundle extras = data.getExtras();
Bitmap imageBitmap = (Bitmap) extras.get("data");
StorageReference ref = mStorageRef.child("taken_images/"+Globals.course_id+".jpg");
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
imageBitmap.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
int qualityFactor=100;
byte[] uploadData = bytes.toByteArray();
uploadData = bytes.toByteArray();
String imageString = Base64.encodeToString(uploadData,Base64.DEFAULT);
Toast.makeText(MainActivity.this,"ASDF",Toast.LENGTH_SHORT).show();
}
}
}
TakeAttendance.java
public class TakeAttendance extends Fragment {
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
private String mParam1;
private String mParam2;
private ArrayList<Course> arr = new ArrayList<>();
private StorageReference mStorageRef;
AlertDialog.Builder builder;
LayoutInflater inflater;
View vv;
private AlertDialog dialog;
private OnFragmentInteractionListener mListener;
private ListView listView;
private View inflatedView;
FirebaseFirestore db;
public TakeAttendance() {
// Required empty public constructor
}
public static TakeAttendance newInstance(String param1, String param2) {
TakeAttendance fragment = new TakeAttendance();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
private ArrayList<String> courseIds = new ArrayList<>();
private TakeAttendanceCustomAdapter adap;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
inflatedView = inflater.inflate(R.layout.fragment_take_attendance, container, false);
builder = new AlertDialog.Builder(getContext());
builder.setCancelable(false);
inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
vv = inflater.inflate(R.layout.layout_logging_in_dialog,null);
builder.setView(vv);
dialog = builder.create();
listView = (ListView)inflatedView.findViewById(R.id.listView);
db = FirebaseFirestore.getInstance();
dialog.show();
Log.d("myMSG",getActivity().getIntent().getStringExtra("uid"));
db.collection("teacher_course").document(getActivity().getIntent().getStringExtra(Constants.uid_parameter)).get().addOnSuccessListener(
new OnSuccessListener<DocumentSnapshot>() {
@Override
public void onSuccess(DocumentSnapshot documentSnapshot) {
Log.d("myMSG","Success");
Map<String,Object> map = documentSnapshot.getData();
Log.d("myMSG",new Integer(map.size()).toString());
Iterator it = map.entrySet().iterator();
while(it.hasNext()){
Log.d("myMSG","entered");
Map.Entry pair = (Map.Entry)it.next();
Log.d("myMSG",pair.getKey().toString());
final String courseId = pair.getKey().toString();
db.collection("courses").document(courseId).get().addOnSuccessListener(
new OnSuccessListener<DocumentSnapshot>() {
@Override
public void onSuccess(DocumentSnapshot documentSnapshot) {
Map <String, Object> map = documentSnapshot.getData();
arr.add(new Course(map.get(Constants.course_name).toString(),map.get(Constants.course_number).toString(),courseId));
adap = new TakeAttendanceCustomAdapter(arr,getContext(),getActivity());
listView.setAdapter(adap);
}
}
);
it.remove();
}
dialog.hide();
Log.d("myMSG",new Integer(arr.size()).toString());
}
}
);
return inflatedView;
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement com.example.redwanulsourav.attendance.OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
}
TakeAttendanceCustomAdapter.java
public class TakeAttendanceCustomAdapter extends ArrayAdapter<Course>{
private ArrayList<Course> dataSet;
Context mContext;
Activity mActivity;
public TakeAttendanceCustomAdapter(ArrayList < Course> data, Context context, Activity activity){
super(context,0,data);
this.dataSet = data;
this.mContext=context;
mActivity = activity;
}
@NonNull
@Override
public View getView(int position, View convertView, ViewGroup parent){
View listItem = convertView;
if(listItem == null){
listItem = LayoutInflater.from(mContext).inflate(R.layout.take_picture_list_single_element,parent,false);
}
final Course currentCourse = dataSet.get(position);
TextView tv = (TextView)listItem.findViewById(R.id.course_name);
tv.setText(currentCourse.getCourse_name());
tv = (TextView)listItem.findViewById(R.id.course_number);
tv.setText(currentCourse.getCourse_number());
Button btn = (Button)listItem.findViewById(R.id.take_picture_button);
Button btn2 = (Button)listItem.findViewById(R.id.browse);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (ContextCompat.checkSelfPermission(mContext, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(mActivity, new String[] { Manifest.permission.CAMERA }, 0);
}
else{
Log.d("Message","Already has permissions");
}
Globals.course_id = currentCourse.getCourse_id();
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
mActivity.startActivityForResult(intent, 100);
}
});
btn2.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("*/*");
mActivity.startActivityForResult(intent,200);
}
}
);
return listItem;
}
}
**Course.java**
package com.example.redwanulsourav.attendance;
public class Course {
public String getCourse_number() {
return course_number;
}
public void setCourse_number(String course_number) {
this.course_number = course_number;
}
public String getCourse_name() {
return course_name;
}
public void setCourse_name(String course_name) {
this.course_name = course_name;
}
private String course_number;
private String course_name;
public String getCourse_id() {
return course_id;
}
public void setCourse_id(String course_id) {
this.course_id = course_id;
}
private String course_id;
public Course(String _course_name, String _course_number, String _course_id){
this.course_name = _course_name;
this.course_number = _course_number;
this.course_id=_course_id;
}
public Course(){
}
}
Logcat引发以下异常
Logcat
2018-11-24 21:02:16.833 1115-2308/? E/Watchdog: Failed to write to /sys/kernel/hungtask/vm_heart
java.io.FileNotFoundException: /sys/kernel/hungtask/vm_heart (Permission denied)
at java.io.FileOutputStream.open0(Native Method)
at java.io.FileOutputStream.open(FileOutputStream.java:287)
at java.io.FileOutputStream.<init>(FileOutputStream.java:223)
at java.io.FileOutputStream.<init>(FileOutputStream.java:110)
at com.android.server.Watchdog.writeHungtask(Watchdog.java:790)
at com.android.server.Watchdog.run(Watchdog.java:542)
正在从TakeAttendance.java中调用摄影机意图
答案 0 :(得分：1)
解决您的问题 在清单中的应用程序标记下添加此行。
android:largeHeap="true"