Recyclerview 行图像未显示
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【中文标题】Recyclerview 行图像未显示【英文标题】：Recycle View row image not showing up 【发布时间】：2017-11-18 21:36:48 【问题描述】：我正在使用自定义适配器构建一个简单的回收视图，我已经设置了所有元素的位置，但不知何故，我的行的主要图像没有显示出来，我不知道为什么。
在我更改它之前显示的 xml，所以基本上我有我的主要活动：
public class PlantFeed extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener,PlantFeedAdapter.OnItemClickListener
//initialize fields
String token;
ArrayList<PlantPhotoUser> photos = new ArrayList<>();
VolleyService mVolleyService;
IResult mResultCallback = null;
final String GETREQUEST = "GETCALL";
String connectionTxt;
String URL;
String date;
String lat;
String lon;
String alt;
PlantFeedAdapter plantFeedAdapter;
RecyclerView recyclerView;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_plant_feed);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
connectionString connection = ((connectionString) getApplicationContext());
connectionTxt = connection.getGlobalVarValue();
URL = connectionTxt + "/fotos";
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Intent i = new Intent(PlantFeed.this,CameraCapture.class);
startActivity(i);
);
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.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
recyclerView = (RecyclerView)findViewById(R.id.recycleView2);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
plantFeedAdapter = new PlantFeedAdapter(getApplicationContext(), photos,PlantFeed.this);
recyclerView.setAdapter(plantFeedAdapter);
token = checkForToken();
initVolleyCallback();
mVolleyService = new VolleyService(mResultCallback,this);
mVolleyService.getDataVolley(GETREQUEST,URL,token);
void initVolleyCallback()
mResultCallback = new IResult()
@Override
public void notifySuccess(String requestType,JSONObject response)
Log.d("HELLL","hi1");
@Override
public void notifySuccess(String requestType, JSONArray response)
PlantPhotoUser plantPhotoUser;
Log.d("HELLLL","hi");
for (int i=0; i < response.length(); i++)
try
JSONObject object = response.getJSONObject(i);
Log.d("objeto",object.toString());
int userId = object.getInt("userId");
Log.d("objeto",String.valueOf(userId));
String username = object.getJSONObject("user").getString("username");
Log.d("objeto",String.valueOf(username));
int plantId = object.getInt("plantId");
Log.d("objeto",String.valueOf(plantId));
String specie = object.getJSONObject("plant").getString("specie");
Log.d("objeto",String.valueOf(specie));
String path = object.getString("image");
Log.d("objeto",String.valueOf(path));
int fotoId = object.getInt("id");
if(object.getString("date") != null)
date = object.getString("date");
if(object.getString("lat") != null)
lat = object.getString("lat");
if(object.getString("lon") != null)
lon = object.getString("lon");
if(object.getString("altitude") != null)
alt = object.getString("altitude");
plantPhotoUser = new PlantPhotoUser(fotoId,plantId,userId,path,specie,date,lat,lon,alt,username);
photos.add(plantPhotoUser);
catch (JSONException e)
e.printStackTrace();
plantFeedAdapter.notifyDataSetChanged();
@Override
public void notifyError(String requestType,VolleyError error)
Log.d("FAIL",error.toString());
;
public String checkForToken()
SharedPreferences sharedPref = getSharedPreferences("user", MODE_PRIVATE);
String tokenKey = getResources().getString(R.string.token);
String token = sharedPref.getString(getString(R.string.token), tokenKey); // take the token
return token;
@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.plant_feed, menu);
return true;
@Override
public boolean onOptionsItemSelected(MenuItem item)
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in androidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.Perfil)
return true;
return super.onOptionsItemSelected(item);
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item)
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera)
Intent i = new Intent(PlantFeed.this,CameraCapture.class);
startActivity(i);
else if (id == R.id.nav_gallery)
Intent i = new Intent(PlantFeed.this,PlantFeed.class);
startActivity(i);
else if (id == R.id.nav_slideshow)
Intent i = new Intent(PlantFeed.this,FamilyLibrary.class);
startActivity(i);
else if (id == R.id.nav_manage)
else if (id == R.id.nav_share)
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
@Override
public void onRowClick(int position, String name, int id, View view)
@Override
public void onTitleClicked(int position, int id, View clickedview)
Intent i = new Intent(this,PhotosForPlant.class);
i.putExtra("plantId",String.valueOf(id));
startActivity(i);
@Override
public void onImageClicked(int position, int id, View clickedview)
Intent i = new Intent(this,PhotosForPlant.class);
i.putExtra("plantId",String.valueOf(id));
startActivity(i);
@Override
public void onReportClicked(int position, int id, String name, View clickedview)
Log.d("HELLLO","HELLOO");
showDialogReport(id,name);
@Override
public void onUserIconClicked(int position, int id, View clickedview)
Intent i = new Intent(this,UserProfile.class);
i.putExtra("userId",id);
startActivity(i);
@Override
public void onUsernameClicked(int position, int id, View clickedview)
Intent i = new Intent(this,UserProfile.class);
i.putExtra("userId",id);
startActivity(i);
@Override
public void onAvaliationClicked(int position, int id, String name, View clickedview)
private void showDialogReport(int id, String name)
Log.d("HELLLO","HELLOO");
AlertDialog.Builder builder = new AlertDialog.Builder(PlantFeed.this);
builder.setTitle(name);
builder.setMessage("Tem a certeza que pretende reportar a fotografia?");
builder.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener()
public void onClick(DialogInterface dialog, int id)
//TODO reportar base de dados
);
builder.setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener()
public void onClick(DialogInterface dialog, int id)
dialog.dismiss();
);
AlertDialog dialog = builder.create();
dialog.show();
然后我的客户适配器是这样的：
public class PlantFeedAdapter extends RecyclerView.Adapter<PlantFeedAdapter.ViewHolder>
private OnItemClickListener listener;
public interface OnItemClickListener
void onRowClick(int position, String name, int id, View view);
void onTitleClicked(int position, int id, View clickedview);
void onImageClicked(int position,int id, View clickedview);
void onReportClicked(int position, int id,String name, View clickedview);
void onUserIconClicked(int position, int id, View clickedview);
void onUsernameClicked(int position, int id, View clickedview);
void onAvaliationClicked(int position, int id,String name, View clickedview);
private ArrayList<PlantPhotoUser> photos;
private Context context;
public PlantFeedAdapter(Context context, ArrayList<PlantPhotoUser> photos, OnItemClickListener listener)
this.photos = photos;
this.context = context;
this.listener = listener;
@Override
public PlantFeedAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i)
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.plant_feed_row, viewGroup, false);
return new ViewHolder(view);
@Override
public void onBindViewHolder(final PlantFeedAdapter.ViewHolder viewHolder, final int i)
viewHolder.name.setText(photos.get(i).getSpecie());
viewHolder.username.setText(photos.get(i).getUsernName());
viewHolder.data.setText(photos.get(i).getDate().split("T")[0]);
Log.d("data123",(photos.get(i).getDate().toString()));
String urlFoto = "http://fe1b7efd.ngrok.io/" + photos.get(i).getPath();
if(urlFoto.toLowerCase().contains("public/"))
urlFoto = urlFoto.replace("public/","");
viewHolder.userIcon.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
if (listener != null)
listener.onUserIconClicked(viewHolder.getAdapterPosition(), photos.get(i).getUserId(), view);
);
viewHolder.username.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
if (listener != null)
listener.onUsernameClicked(viewHolder.getAdapterPosition(),photos.get(i).getUserId(), view);
);
viewHolder.plantImg.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
if (listener != null)
listener.onImageClicked(viewHolder.getAdapterPosition(), photos.get(i).getIdPlant(), view);
);
viewHolder.name.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
if(listener != null)
listener.onTitleClicked(viewHolder.getAdapterPosition(),photos.get(i).getIdPlant(),v);
);
viewHolder.reportImage.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
if(listener != null)
listener.onReportClicked(viewHolder.getAdapterPosition(),photos.get(i).getIdPlant(),photos.get(i).getSpecie(),v);
);
/*viewHolder.avaliationFoto.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
if(listener != null)
listener.onAvaliationClicked(viewHolder.getAdapterPosition(),photos.get(i).getIdPlant(),photos.get(i).getSpecie(),v);
);*/
Picasso.with(context)
.load(urlFoto)
.resize(300, 300)
.into(viewHolder.plantImg);
@Override
public int getItemCount()
return photos.size();
public class ViewHolder extends RecyclerView.ViewHolder
private TextView name;
private ImageView userIcon;
private TextView avaliationFoto;
private ImageView plantImg;
private ImageView foto;
private TextView username;
private ImageView reportImage;
private TextView data;
public ViewHolder(View view)
super(view);
data = (TextView)view.findViewById(R.id.data);
name = (TextView) view.findViewById(R.id.plantName);
userIcon = (ImageView)view.findViewById(R.id.userIcon);
plantImg = (ImageView)view.findViewById(R.id.plantPhoto);;
username = (TextView)view.findViewById(R.id.password);
reportImage = (ImageView)view.findViewById(R.id.cameraForbiden);
最后是我的行 xml，我认为哪里有问题
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_
android:layout_
android:background="#cfcfcf">
<LinearLayout
android:layout_margin="10dp"
android:background="#ffffff"
android:orientation="horizontal"
android:layout_
android:layout_>
<com.android.volley.toolbox.NetworkImageView
android:layout_weight="1"
android:layout_
android:layout_
android:padding="0dp"
app:srcCompat="@mipmap/ic_launcher"
android:id="@+id/plantPhoto"
android:background="#c7c7c7"
/>
<LinearLayout
android:layout_weight="20"
android:orientation="vertical"
android:layout_
android:layout_>
<RelativeLayout
android:layout_
android:layout_>
<TextView
android:id="@+id/plantName"
android:layout_
android:layout_
android:gravity="right"
android:padding="15dp"
android:text="TextView"
android:textColor="#000"
android:textSize="20dp" />
<ImageView
android:id="@+id/starIcon"
android:layout_
android:layout_
android:padding="15dp"
android:gravity="right"
android:src="@drawable/ic_star" />
</RelativeLayout>
<RelativeLayout
android:layout_
android:layout_
android:padding="15dp">
<com.example.afcosta.inesctec.pt.android.Helpers.NexusBoldTextView
android:id="@+id/data"
android:layout_
android:layout_
android:layout_toStartOf="@+id/cameraForbiden"
android:text="TextView"
android:textColor="@color/base" />
<ImageView
android:id="@+id/cameraForbiden"
android:layout_
android:layout_
android:layout_alignParentEnd="true"
android:src="@drawable/ic_no_photos" />
<ImageView
android:id="@+id/userIcon"
android:layout_
android:layout_
android:gravity="left"
android:layout_alignParentBottom="true"
android:src="@drawable/ic_user" />
<com.example.afcosta.inesctec.pt.android.Helpers.NexusBoldTextView
android:id="@+id/password"
android:layout_
android:layout_
android:layout_toRightOf="@+id/userIcon"
android:text="Filipe"
android:textColor="@color/base" />
</RelativeLayout>
</LinearLayout>
</LinearLayout>
问题出在这个元素上：
<com.android.volley.toolbox.NetworkImageView
android:layout_weight="1"
android:layout_
android:layout_
android:padding="0dp"
app:srcCompat="@mipmap/ic_launcher"
android:id="@+id/plantPhoto"
android:background="#c7c7c7"
/>
【问题讨论】：
移除背景并检查是否有效 你的 minSDKVersion 是多少？尝试使用 android:src="@mipmap/ic_launcher" 代替 app:srcCompat="@mipmap/ic_launcher" 试过了，但还是没有：/ 【参考方案1】：用毕加索添加 centerCrop()
Picasso.with(context)
.load(url)
.resize(50, 50)
.centerCrop()
.into(imageView)
【讨论】：
在 Picasso 中使用普通的 ImageView【参考方案2】：在您的适配器和 ViewHolder 中更改此行，因为类型转换是错误的。 ：
private ImageView plantImg;
plantImg = (ImageView)view.findViewById(R.id.plantPhoto);;
到
private NetworkImageView plantImg;
plantImg= (NetworkImageView) findViewById(R.id
.plantPhoto); 然后设置图片。
编辑
`private ImageLoader mImageLoader;
mImageLoader = CustomVolleyRequestQueue.getInstance(this.getApplicationContext())
.getImageLoader();
mImageLoader.get(url, ImageLoader.getImageListener(mNetworkImageView,
R.mipmap.truiton_short, android.R.drawable
.ic_dialog_alert));
mNetworkImageView.setImageUrl(url, mImageLoader);`
使用此链接http://www.truiton.com/2015/03/android-volley-imageloader-networkimageview-example/ 获取更多指导。
【讨论】：
照你说的做了，但还是一无所获：/以上是关于Recyclerview 行图像未显示的主要内容，如果未能解决你的问题，请参考以下文章
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