Android 图像Uri未显示在listview和警报对话框中
谢谢你阅读我的问题。因为我的问题是图像uri没有显示，所以我确保上传的小尺寸图像不超过6KB。所以这里的问题不是图像的大小 我在下面有一个屏幕截图，让您对这里发生的事情有一个大致的了解： 这是我的AddStudent.xml，允许用户添加新项目 添加的项目将显示在my Main活动的列表视图中。如你所见，我先添加了安吉丽娜·朱莉，图像仍在附件中，当我添加另一个名叫布拉德·皮特的人时，第一张图像没有显示，以此类推。只有最后添加的项目才会显示图像 当我尝试筛选搜索时，列表中的所有图像都不会显示。我有一个上下文菜单，当用户长按该项时，将显示一个显示、编辑和删除选项 问题还在于，当我显示项目时，图像不在那里，以及当我编辑时。setImageUri似乎不起作用 你能告诉我我做错了什么以及如何解决它吗？谢谢 AddStudentActivity.javaAndroid 图像Uri未显示在listview和警报对话框中,android,listview,Android,Listview,谢谢你阅读我的问题。因为我的问题是图像uri没有显示，所以我确保上传的小尺寸图像不超过6KB。所以这里的问题不是图像的大小 我在下面有一个屏幕截图，让您对这里发生的事情有一个大致的了解： 这是我的AddStudent.xml，允许用户添加新项目 添加的项目将显示在my Main活动的列表视图中。如你所见，我先添加了安吉丽娜·朱莉，图像仍在附件中，当我添加另一个名叫布拉德·皮特的人时，第一张图像没有显示，以此类推。只有最后添加的项目才会显示图像 当我尝试筛选搜索时，列表中的所有图像都不会显示。我有
public class AddStudentActivity extends AppCompatActivity implements View.OnClickListener, AdapterView.OnItemSelectedListener {
ListView lv;
ImageView studImage;
Uri studImageUri;
EditText lastname, firstname;
String selectedCourse;
Spinner course;
Button btnsave, btncancel;
CustomAdapter adapter;
private int pos;
private static final int PICK_IMAGE = 100;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_student);
//
String [] courselist = this.getResources().getStringArray(R.array.course_list);
//
studImage = (ImageView) findViewById(R.id.addstudentimage);
lastname = (EditText) findViewById(R.id.editTextLastname);
firstname = (EditText) findViewById(R.id.editTextFirstname);
course = (Spinner) findViewById(R.id.spinnerCourse);
btnsave = (Button) findViewById(R.id.btn_save);
btncancel = (Button) findViewById(R.id.btn_cancel);
//adding an event listeners to the elements
studImage.setOnClickListener(this);
btnsave.setOnClickListener(this);
btncancel.setOnClickListener(this);
course.setOnItemSelectedListener(this);
//checking if there is an edit action invoked
Bundle b = this.getIntent().getExtras();
if(b != null){
Uri image = b.getParcelable("image");
String lastname = b.getString("lastname");
String firstname = b.getString("firstname");
String newcourse = b.getString("course");
for(int i=0; i< courselist.length; i++)
if (courselist[i].equals(newcourse)){
pos=i;
break;
}
//
this.studImage.setImageURI(image);
this.lastname.setText(lastname);
this.firstname.setText(firstname);
this.course.setSelection(pos);
}
}
//on click listeners for the buttons and imageview
@Override
public void onClick(View v) {
int id = v.getId();
switch (id){
case R.id.addstudentimage:
Intent gallery = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
startActivityForResult(gallery, PICK_IMAGE);
break;
case R.id.btn_save:
String lname = lastname.getText().toString();
String fname = firstname.getText().toString();
String newCourse = course.getSelectedItem().toString();
if(!studImage.equals(R.drawable.user) && !lastname.equals(" ") && !firstname.equals("") && !course.getSelectedItem().toString().trim().equals(0)){
Intent intent = new Intent(); //blind intent
intent.putExtra("image", this.studImageUri);
intent.putExtra("lastname", lname);
intent.putExtra("firstname", fname);
intent.putExtra("course", newCourse);
this.setResult(Activity.RESULT_OK, intent);
finish();
}else{
Toast.makeText(getApplicationContext(), "Please fill in all fields", Toast.LENGTH_SHORT).show();
}
break;
case R.id.btn_cancel:
studImage.setImageResource(R.drawable.user);
lastname.setText("");
firstname.setText("");
course.setSelection(0);
break;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode != 0){
if(data != null){
studImageUri = data.getData();
studImage.setImageURI(studImageUri);
}
}else {
}
}
//on click listeners for the spinners
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
int sid = parent.getId();
switch (sid){
case R.id.spinnerCourse:
selectedCourse = this.course.getItemAtPosition(position).toString();
break;
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
}
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
ArrayList<Student> studentArrayList = new ArrayList<>();
ArrayList<Student> findlist = new ArrayList<>();
CustomAdapter adapter;
private Uri imageUri;
ListView lv;
AlertDialog.Builder show_builder;
AlertDialog dialog;
LinearLayout layout;
ImageView imageView;
TextView stud_lname, stud_fname, stud_course;
AdapterView.AdapterContextMenuInfo info;
//
EditText txtsearch;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv = (ListView) findViewById(R.id.student_listview);
txtsearch = (EditText) findViewById(R.id.textsearch);
adapter = new CustomAdapter(this, studentArrayList);
lv.setAdapter(adapter);
final CustomAdapter mAdapter = new CustomAdapter(this, findlist);
registerForContextMenu(lv);
lv.setOnItemClickListener(this);
//
show_builder = new AlertDialog.Builder(this);
txtsearch.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
findlist.clear();
String s1 = s.toString();
Pattern pattern = Pattern.compile(s1);
for (int i=0; i<studentArrayList.size(); i++){
String find = studentArrayList.get(i).getStudfname().toLowerCase();
Matcher matcher = pattern.matcher(find);
if(matcher.find()){
findlist.add(studentArrayList.get(i));
lv.setAdapter(mAdapter);
adapter.notifyDataSetChanged();
}//end if
}
}
@Override
public void afterTextChanged(Editable s) {
}
});
}
//for menu
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if(id == android.R.id.home){
onBackPressed();
return true;
}else if(id == R.id.action_add){
Intent add = new Intent(MainActivity.this, AddStudentActivity.class);
startActivityForResult(add, 0);
}
return super.onOptionsItemSelected(item);
}
//inflate the menu
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.addmenu, menu);
return super.onCreateOptionsMenu(menu);
}
//handles the onclick listener for the listview
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(resultCode == Activity.RESULT_OK){
Bundle b = data.getExtras();
imageUri = b.getParcelable("image");
String lastname = b.getString("lastname");
String firstname = b.getString("firstname");
String course = b.getString("course");
Student student = new Student(imageUri, lastname, firstname, course);
//
switch(requestCode){
case 0: //request for adding student information
studentArrayList.add(student);
lv.setAdapter(adapter);
Toast.makeText(getApplicationContext(), "New student successfully added!", Toast.LENGTH_SHORT).show();
break;
case 1: //request for editing student information
studentArrayList.set(info.position, student);
Toast.makeText(this, "Student updated!", Toast.LENGTH_SHORT).show();
break;
}
adapter.notifyDataSetChanged();
}else{
}
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
this.getMenuInflater().inflate(R.menu.contextmenu, menu);
info = (AdapterView.AdapterContextMenuInfo) menuInfo;
menu.setHeaderTitle(studentArrayList.get(info.position).getStudlname()+","
+studentArrayList.get(info.position).getStudfname());
}
@Override
public boolean onContextItemSelected(MenuItem item) {
int id = item.getItemId();
switch (id){
case R.id.show: //display an alert dialog box
this.imageView = new ImageView(this);
this.stud_lname = new TextView(this);
this.stud_fname = new TextView(this);
this.stud_course = new TextView(this);
this.imageView.setImageURI(studentArrayList.get(info.position).getUriImage());
this.show_builder.setTitle(studentArrayList.get(info.position).getStudlname()+", "
+studentArrayList.get(info.position).getStudfname());
this.layout = new LinearLayout(this);
this.layout.setOrientation(LinearLayout.VERTICAL);
this.layout.addView(imageView);
this.layout.addView(stud_lname);
this.layout.addView(stud_fname);
this.layout.addView(stud_course);
this.show_builder.setView(layout);
this.show_builder.setNeutralButton("OKAY", null);
this.dialog = this.show_builder.create();
this.dialog.show();
break;
case R.id.edit: //edit student information by calling the AddStudentActivity
Intent intent = new Intent(MainActivity.this, AddStudentActivity.class);
Student student = studentArrayList.get(info.position);
intent.putExtra("image", student.getUriImage());
intent.putExtra("lastname", student.getStudlname());
intent.putExtra("firstname", student.getStudfname());
intent.putExtra("course", student.getStudcourse());
this.startActivityForResult(intent, 1);
break;
case R.id.delete: //delete student information
this.studentArrayList.remove(info.position);
this.adapter.notifyDataSetChanged();
lv.setAdapter(adapter);
Toast.makeText(this, "Student deleted!", Toast.LENGTH_LONG).show();
break;
}
return super.onContextItemSelected(item);
}
}
public class AddStudentActivity extends AppCompatActivity implements View.OnClickListener, AdapterView.OnItemSelectedListener {
ListView lv;
ImageView studImage;
Uri studImageUri;
EditText lastname, firstname;
String selectedCourse;
Spinner course;
Button btnsave, btncancel;
CustomAdapter adapter;
private int pos;
private static final int PICK_IMAGE = 100;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_student);
//
String [] courselist = this.getResources().getStringArray(R.array.course_list);
//
studImage = (ImageView) findViewById(R.id.addstudentimage);
lastname = (EditText) findViewById(R.id.editTextLastname);
firstname = (EditText) findViewById(R.id.editTextFirstname);
course = (Spinner) findViewById(R.id.spinnerCourse);
btnsave = (Button) findViewById(R.id.btn_save);
btncancel = (Button) findViewById(R.id.btn_cancel);
//adding an event listeners to the elements
studImage.setOnClickListener(this);
btnsave.setOnClickListener(this);
btncancel.setOnClickListener(this);
course.setOnItemSelectedListener(this);
//checking if there is an edit action invoked
Bundle b = this.getIntent().getExtras();
if(b != null){
Uri image = b.getParcelable("image");
String lastname = b.getString("lastname");
String firstname = b.getString("firstname");
String newcourse = b.getString("course");
for(int i=0; i< courselist.length; i++)
if (courselist[i].equals(newcourse)){
pos=i;
break;
}
//
this.studImage.setImageURI(image);
this.lastname.setText(lastname);
this.firstname.setText(firstname);
this.course.setSelection(pos);
}
}
//on click listeners for the buttons and imageview
@Override
public void onClick(View v) {
int id = v.getId();
switch (id){
case R.id.addstudentimage:
Intent gallery = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
startActivityForResult(gallery, PICK_IMAGE);
break;
case R.id.btn_save:
String lname = lastname.getText().toString();
String fname = firstname.getText().toString();
String newCourse = course.getSelectedItem().toString();
if(!studImage.equals(R.drawable.user) && !lastname.equals(" ") && !firstname.equals("") && !course.getSelectedItem().toString().trim().equals(0)){
Intent intent = new Intent(); //blind intent
intent.putExtra("image", this.studImageUri);
intent.putExtra("lastname", lname);
intent.putExtra("firstname", fname);
intent.putExtra("course", newCourse);
this.setResult(Activity.RESULT_OK, intent);
finish();
}else{
Toast.makeText(getApplicationContext(), "Please fill in all fields", Toast.LENGTH_SHORT).show();
}
break;
case R.id.btn_cancel:
studImage.setImageResource(R.drawable.user);
lastname.setText("");
firstname.setText("");
course.setSelection(0);
break;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode != 0){
if(data != null){
studImageUri = data.getData();
studImage.setImageURI(studImageUri);
}
}else {
}
}
//on click listeners for the spinners
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
int sid = parent.getId();
switch (sid){
case R.id.spinnerCourse:
selectedCourse = this.course.getItemAtPosition(position).toString();
break;
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
}
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
ArrayList<Student> studentArrayList = new ArrayList<>();
ArrayList<Student> findlist = new ArrayList<>();
CustomAdapter adapter;
private Uri imageUri;
ListView lv;
AlertDialog.Builder show_builder;
AlertDialog dialog;
LinearLayout layout;
ImageView imageView;
TextView stud_lname, stud_fname, stud_course;
AdapterView.AdapterContextMenuInfo info;
//
EditText txtsearch;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv = (ListView) findViewById(R.id.student_listview);
txtsearch = (EditText) findViewById(R.id.textsearch);
adapter = new CustomAdapter(this, studentArrayList);
lv.setAdapter(adapter);
final CustomAdapter mAdapter = new CustomAdapter(this, findlist);
registerForContextMenu(lv);
lv.setOnItemClickListener(this);
//
show_builder = new AlertDialog.Builder(this);
txtsearch.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
findlist.clear();
String s1 = s.toString();
Pattern pattern = Pattern.compile(s1);
for (int i=0; i<studentArrayList.size(); i++){
String find = studentArrayList.get(i).getStudfname().toLowerCase();
Matcher matcher = pattern.matcher(find);
if(matcher.find()){
findlist.add(studentArrayList.get(i));
lv.setAdapter(mAdapter);
adapter.notifyDataSetChanged();
}//end if
}
}
@Override
public void afterTextChanged(Editable s) {
}
});
}
//for menu
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if(id == android.R.id.home){
onBackPressed();
return true;
}else if(id == R.id.action_add){
Intent add = new Intent(MainActivity.this, AddStudentActivity.class);
startActivityForResult(add, 0);
}
return super.onOptionsItemSelected(item);
}
//inflate the menu
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.addmenu, menu);
return super.onCreateOptionsMenu(menu);
}
//handles the onclick listener for the listview
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(resultCode == Activity.RESULT_OK){
Bundle b = data.getExtras();
imageUri = b.getParcelable("image");
String lastname = b.getString("lastname");
String firstname = b.getString("firstname");
String course = b.getString("course");
Student student = new Student(imageUri, lastname, firstname, course);
//
switch(requestCode){
case 0: //request for adding student information
studentArrayList.add(student);
lv.setAdapter(adapter);
Toast.makeText(getApplicationContext(), "New student successfully added!", Toast.LENGTH_SHORT).show();
break;
case 1: //request for editing student information
studentArrayList.set(info.position, student);
Toast.makeText(this, "Student updated!", Toast.LENGTH_SHORT).show();
break;
}
adapter.notifyDataSetChanged();
}else{
}
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
this.getMenuInflater().inflate(R.menu.contextmenu, menu);
info = (AdapterView.AdapterContextMenuInfo) menuInfo;
menu.setHeaderTitle(studentArrayList.get(info.position).getStudlname()+","
+studentArrayList.get(info.position).getStudfname());
}
@Override
public boolean onContextItemSelected(MenuItem item) {
int id = item.getItemId();
switch (id){
case R.id.show: //display an alert dialog box
this.imageView = new ImageView(this);
this.stud_lname = new TextView(this);
this.stud_fname = new TextView(this);
this.stud_course = new TextView(this);
this.imageView.setImageURI(studentArrayList.get(info.position).getUriImage());
this.show_builder.setTitle(studentArrayList.get(info.position).getStudlname()+", "
+studentArrayList.get(info.position).getStudfname());
this.layout = new LinearLayout(this);
this.layout.setOrientation(LinearLayout.VERTICAL);
this.layout.addView(imageView);
this.layout.addView(stud_lname);
this.layout.addView(stud_fname);
this.layout.addView(stud_course);
this.show_builder.setView(layout);
this.show_builder.setNeutralButton("OKAY", null);
this.dialog = this.show_builder.create();
this.dialog.show();
break;
case R.id.edit: //edit student information by calling the AddStudentActivity
Intent intent = new Intent(MainActivity.this, AddStudentActivity.class);
Student student = studentArrayList.get(info.position);
intent.putExtra("image", student.getUriImage());
intent.putExtra("lastname", student.getStudlname());
intent.putExtra("firstname", student.getStudfname());
intent.putExtra("course", student.getStudcourse());
this.startActivityForResult(intent, 1);
break;
case R.id.delete: //delete student information
this.studentArrayList.remove(info.position);
this.adapter.notifyDataSetChanged();
lv.setAdapter(adapter);
Toast.makeText(this, "Student deleted!", Toast.LENGTH_LONG).show();
break;
}
return super.onContextItemSelected(item);
}
}
public class CustomAdapter extends BaseAdapter {
Context context;
//data container
ArrayList<Student> list;
LayoutInflater inflater;
//contructor
public CustomAdapter(Context context, ArrayList<Student> list) {
this.context = context;
this.list = list;
this.inflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if(convertView == null){
holder = new ViewHolder();
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.custom_layout, parent, false);
holder.iv = (ImageView) convertView.findViewById(R.id.imageView);
holder.lname = (TextView) convertView.findViewById(R.id.textLastname);
holder.fname= (TextView) convertView.findViewById(R.id.textFirstname);
holder.course = (TextView) convertView.findViewById(R.id.textCourse);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
//inflate
holder.iv.setImageURI(list.get(position).getUriImage());
holder.lname.setText(list.get(position).getStudlname());
holder.fname.setText(list.get(position).getStudfname());
holder.course.setText(list.get(position).getStudcourse());
return convertView;
}
//creating a static class
static class ViewHolder{
ImageView iv;
TextView lname, fname,course;
}
}
更新：我已经解决了我的问题。我了解到这里的问题是我使用了行动选择。我刚从以下位置更改了代码：
Intent gallery = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
startActivityForResult(gallery, PICK_IMAGE);
字符串imageUri=b.getParcelableimage@JohnJoe imageUri是我已经声明的Uri。在我的模型中，图像设置为Uri，但你的应用看起来很酷：很好，你修复了：