RecyclerView中有多个对象出错(Error with multiple objects in RecyclerView)
我在这里用本教程制作了一个RecyclerView。 一个对象（一行）都可以正常工作。 添加第二行后，我的布局被完全销毁，只显示第一个对象。 有人知道回答吗？
这是一行（All应该看起来像这一行）：
这应该像第一行一样：
这是我创建对象的片段：
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_settings, container, false);
accountRecyclerView = (RecyclerView) view.findViewById(R.id.account_recycler_view);
aAdapter = new SettingsAdapter(settingList);
RecyclerView.LayoutManager aLayoutManager = new LinearLayoutManager(getActivity().getApplicationContext()) {
// Disable scrolling in the RecyclerView
@Override
public boolean canScrollVertically() {
return false;
}
};
// Setup account RecyclerView
accountRecyclerView.setLayoutManager(aLayoutManager);
accountRecyclerView.setItemAnimator(new DefaultItemAnimator());
accountRecyclerView.setAdapter(aAdapter);
prepareAccountData();
return view;
}
private void prepareAccountData() {
// Create new setting
Settings setting = new Settings(1, R.drawable.ic_menu_logout, "Abmelden", "Deine Daten bleibe erhalten");
// Add Object to list
settingList.add(setting);
setting = new Settings(2, R.drawable.ic_menu_logout, "Testadd", "Some text");
settingList.add(setting);
// Notify data changes
aAdapter.notifyDataSetChanged();
}
这是我的适配器：
public class SettingsAdapter extends RecyclerView.Adapter<SettingsAdapter.MySettingHolder> {
private List<Settings> settingList;
private Context context;
public class MySettingHolder extends RecyclerView.ViewHolder {
public int type;
public ImageView settingImage;
public TextView settingTitle, settingSubtitle;
public MySettingHolder(View view) {
super(view);
settingImage = (ImageView) view.findViewById(R.id.settingImage);
settingTitle = (TextView) view.findViewById(R.id.settingTitle);
settingSubtitle = (TextView) view.findViewById(R.id.settingSubtitle);
}
}
public SettingsAdapter(Context context) {
this.context = context;
}
public SettingsAdapter(List<Settings> settingList) {
this.settingList = settingList;
}
@Override
public MySettingHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.settings_list_row, parent, false);
return new MySettingHolder(itemView);
}
@Override
public void onBindViewHolder(MySettingHolder holder, int position) {
// Setting for one entry
final Settings setting = settingList.get(position);
//RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
holder.settingImage.setImageResource(setting.getSettingImageUrl());
// If the settingSubtitle is empty it should be not visible and just the settingTitle
if (setting.getSettingSubtitle().equals("")) {
//params.setMargins(0, 18, 0, 18);
//holder.settingTitle.setLayoutParams(params);
holder.settingTitle.setText(setting.getSettingTitle());
holder.settingSubtitle.setVisibility(View.GONE);
} else {
//params.setMargins(0, 18, 0, 18);
//holder.settingTitle.setLayoutParams(params);
//params.setMargins(0, 0, 0, 18);
//holder.settingSubtitle.setLayoutParams(params);
holder.settingTitle.setText(setting.getSettingTitle());
holder.settingSubtitle.setText(setting.getSettingSubtitle());
}
// Get setting holder type
holder.type = setting.getType();
// OnTouchListener for holder/vector color change
holder.itemView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
// Define setting holder
MySettingHolder holder = (MySettingHolder) (v.getTag());
// ImageView for changing color
ImageView imageView = (ImageView) v.findViewById(R.id.settingImage);
// Detect if user touch or not
if (event.getAction() == android.view.MotionEvent.ACTION_DOWN) {
// Change ImageView color to primary color
DrawableCompat.setTint(imageView.getDrawable(), ContextCompat.getColor(v.getContext(), R.color.colorPrimary));
} else if (event.getAction() == android.view.MotionEvent.ACTION_UP) {
// Change ImageView color to primary color
DrawableCompat.setTint(imageView.getDrawable(), ContextCompat.getColor(v.getContext(), R.color.iconGray));
}
return false;
}
});
// OnClickListener for holder
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View v) {
// Define setting holder
MySettingHolder holder = (MySettingHolder) (v.getTag());
// Define switch for line
switch (holder.type) {
// Case 1 = Logout
case 1:
// OnCLickListener for an event
DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
switch (which) {
// Case user types Yes
case DialogInterface.BUTTON_POSITIVE:
// Deleting shared preferences for login activity
SharedPreferences loginPreferences = v.getRootView().getContext().getSharedPreferences("loginPrefs", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = loginPreferences.edit();
editor.clear();
editor.commit();
// Start new acitivity for login
v.getContext().startActivity(new Intent(v.getContext(), LoginActivity.class));
// Exit activity
((Activity)v.getContext()).finish();
// Exit case button positive/yes
break;
case DialogInterface.BUTTON_NEGATIVE:
// Dismiss dialog
dialog.dismiss();
// Exit case button negative/no
break;
}
}
};
// AlertDialog for logout check
AlertDialog.Builder builder = new AlertDialog.Builder(v.getRootView().getContext());
builder.setMessage("Möchtest du dich wirklich abmelden?")
.setPositiveButton("Ja", dialogClickListener)
.setNegativeButton("Nein", dialogClickListener)
.show();
// Exit switch
break;
case 2:
// do other stuff
break;
default:
break;
}
}
});
holder.itemView.setTag(holder);
}
@Override
public int getItemCount() {
return settingList.size();
}
}
这是我的setter / getter：
public class Settings {
private String settingTitle, settingSubtitle;
private int settingImageUrl;
private int type;
public Settings(int type, int settingImageUrl, String settingTitle, String settingSubtitle) {
this.type = type;
this.settingImageUrl = settingImageUrl;
this.settingTitle = settingTitle;
this.settingSubtitle = settingSubtitle;
}
public void setSettingImage(int settingImageUrl) {
this.settingImageUrl = settingImageUrl;
}
public int getSettingImageUrl() {
return settingImageUrl;
}
public void setSettingTitle(String settingTitle) {
this.settingTitle = settingTitle;
}
public String getSettingTitle() {
return settingTitle;
}
public void setSettingSubtitle(String settingSubtitle) {
this.settingSubtitle = settingSubtitle;
}
public String getSettingSubtitle() {
return settingSubtitle;
}
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
}
这是我定义行的xml：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:focusable="true"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:clickable="true"
android:background="?android:attr/selectableItemBackground"
android:orientation="vertical">
<!-- Setting icon -->
<ImageView
android:id="@+id/settingImage"
android:layout_width="24dp"
android:layout_height="24dp"
android:layout_centerVertical="true"
android:layout_alignParentStart="true"
android:layout_marginRight="8dp"
android:layout_marginTop="1dp"
android:layout_marginBottom="1dp"
android:contentDescription="Icon"
android:src="@drawable/my_icon" />
<!-- Setting title -->
<TextView
android:id="@+id/settingTitle"
android:textColor="@color/colorBlack"
android:layout_width="match_parent"
android:layout_marginLeft="40dp"
android:layout_marginTop="14dp"
android:textSize="16dp"
android:layout_height="wrap_content" />
<!-- Setting subtitle -->
<TextView
android:id="@+id/settingSubtitle"
android:layout_below="@id/settingTitle"
android:layout_marginBottom="14dp"
android:layout_marginLeft="40dp"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
I've made a RecyclerView with this tutorial here. All is working fine with one object (one line). After adding a second line my layout is completely destroyed and just the first object is shown. Is there someone who knows an answere?
This is one line (All should looks like this line):
This should be another line like the first one:
This is my fragment where I create the objects:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_settings, container, false);
accountRecyclerView = (RecyclerView) view.findViewById(R.id.account_recycler_view);
aAdapter = new SettingsAdapter(settingList);
RecyclerView.LayoutManager aLayoutManager = new LinearLayoutManager(getActivity().getApplicationContext()) {
// Disable scrolling in the RecyclerView
@Override
public boolean canScrollVertically() {
return false;
}
};
// Setup account RecyclerView
accountRecyclerView.setLayoutManager(aLayoutManager);
accountRecyclerView.setItemAnimator(new DefaultItemAnimator());
accountRecyclerView.setAdapter(aAdapter);
prepareAccountData();
return view;
}
private void prepareAccountData() {
// Create new setting
Settings setting = new Settings(1, R.drawable.ic_menu_logout, "Abmelden", "Deine Daten bleibe erhalten");
// Add Object to list
settingList.add(setting);
setting = new Settings(2, R.drawable.ic_menu_logout, "Testadd", "Some text");
settingList.add(setting);
// Notify data changes
aAdapter.notifyDataSetChanged();
}
This is my adapter:
public class SettingsAdapter extends RecyclerView.Adapter<SettingsAdapter.MySettingHolder> {
private List<Settings> settingList;
private Context context;
public class MySettingHolder extends RecyclerView.ViewHolder {
public int type;
public ImageView settingImage;
public TextView settingTitle, settingSubtitle;
public MySettingHolder(View view) {
super(view);
settingImage = (ImageView) view.findViewById(R.id.settingImage);
settingTitle = (TextView) view.findViewById(R.id.settingTitle);
settingSubtitle = (TextView) view.findViewById(R.id.settingSubtitle);
}
}
public SettingsAdapter(Context context) {
this.context = context;
}
public SettingsAdapter(List<Settings> settingList) {
this.settingList = settingList;
}
@Override
public MySettingHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.settings_list_row, parent, false);
return new MySettingHolder(itemView);
}
@Override
public void onBindViewHolder(MySettingHolder holder, int position) {
// Setting for one entry
final Settings setting = settingList.get(position);
//RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
holder.settingImage.setImageResource(setting.getSettingImageUrl());
// If the settingSubtitle is empty it should be not visible and just the settingTitle
if (setting.getSettingSubtitle().equals("")) {
//params.setMargins(0, 18, 0, 18);
//holder.settingTitle.setLayoutParams(params);
holder.settingTitle.setText(setting.getSettingTitle());
holder.settingSubtitle.setVisibility(View.GONE);
} else {
//params.setMargins(0, 18, 0, 18);
//holder.settingTitle.setLayoutParams(params);
//params.setMargins(0, 0, 0, 18);
//holder.settingSubtitle.setLayoutParams(params);
holder.settingTitle.setText(setting.getSettingTitle());
holder.settingSubtitle.setText(setting.getSettingSubtitle());
}
// Get setting holder type
holder.type = setting.getType();
// OnTouchListener for holder/vector color change
holder.itemView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
// Define setting holder
MySettingHolder holder = (MySettingHolder) (v.getTag());
// ImageView for changing color
ImageView imageView = (ImageView) v.findViewById(R.id.settingImage);
// Detect if user touch or not
if (event.getAction() == android.view.MotionEvent.ACTION_DOWN) {
// Change ImageView color to primary color
DrawableCompat.setTint(imageView.getDrawable(), ContextCompat.getColor(v.getContext(), R.color.colorPrimary));
} else if (event.getAction() == android.view.MotionEvent.ACTION_UP) {
// Change ImageView color to primary color
DrawableCompat.setTint(imageView.getDrawable(), ContextCompat.getColor(v.getContext(), R.color.iconGray));
}
return false;
}
});
// OnClickListener for holder
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View v) {
// Define setting holder
MySettingHolder holder = (MySettingHolder) (v.getTag());
// Define switch for line
switch (holder.type) {
// Case 1 = Logout
case 1:
// OnCLickListener for an event
DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
switch (which) {
// Case user types Yes
case DialogInterface.BUTTON_POSITIVE:
// Deleting shared preferences for login activity
SharedPreferences loginPreferences = v.getRootView().getContext().getSharedPreferences("loginPrefs", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = loginPreferences.edit();
editor.clear();
editor.commit();
// Start new acitivity for login
v.getContext().startActivity(new Intent(v.getContext(), LoginActivity.class));
// Exit activity
((Activity)v.getContext()).finish();
// Exit case button positive/yes
break;
case DialogInterface.BUTTON_NEGATIVE:
// Dismiss dialog
dialog.dismiss();
// Exit case button negative/no
break;
}
}
};
// AlertDialog for logout check
AlertDialog.Builder builder = new AlertDialog.Builder(v.getRootView().getContext());
builder.setMessage("Möchtest du dich wirklich abmelden?")
.setPositiveButton("Ja", dialogClickListener)
.setNegativeButton("Nein", dialogClickListener)
.show();
// Exit switch
break;
case 2:
// do other stuff
break;
default:
break;
}
}
});
holder.itemView.setTag(holder);
}
@Override
public int getItemCount() {
return settingList.size();
}
}
This is my setter/getter:
public class Settings {
private String settingTitle, settingSubtitle;
private int settingImageUrl;
private int type;
public Settings(int type, int settingImageUrl, String settingTitle, String settingSubtitle) {
this.type = type;
this.settingImageUrl = settingImageUrl;
this.settingTitle = settingTitle;
this.settingSubtitle = settingSubtitle;
}
public void setSettingImage(int settingImageUrl) {
this.settingImageUrl = settingImageUrl;
}
public int getSettingImageUrl() {
return settingImageUrl;
}
public void setSettingTitle(String settingTitle) {
this.settingTitle = settingTitle;
}
public String getSettingTitle() {
return settingTitle;
}
public void setSettingSubtitle(String settingSubtitle) {
this.settingSubtitle = settingSubtitle;
}
public String getSettingSubtitle() {
return settingSubtitle;
}
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
}
This is my xml where I define the rows:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:focusable="true"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:clickable="true"
android:background="?android:attr/selectableItemBackground"
android:orientation="vertical">
<!-- Setting icon -->
<ImageView
android:id="@+id/settingImage"
android:layout_width="24dp"
android:layout_height="24dp"
android:layout_centerVertical="true"
android:layout_alignParentStart="true"
android:layout_marginRight="8dp"
android:layout_marginTop="1dp"
android:layout_marginBottom="1dp"
android:contentDescription="Icon"
android:src="@drawable/my_icon" />
<!-- Setting title -->
<TextView
android:id="@+id/settingTitle"
android:textColor="@color/colorBlack"
android:layout_width="match_parent"
android:layout_marginLeft="40dp"
android:layout_marginTop="14dp"
android:textSize="16dp"
android:layout_height="wrap_content" />
<!-- Setting subtitle -->
<TextView
android:id="@+id/settingSubtitle"
android:layout_below="@id/settingTitle"
android:layout_marginBottom="14dp"
android:layout_marginLeft="40dp"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
最满意答案
由于项目的高度是match_parent 。 它试图占据整个屏幕并推开其他物品。
尝试在settings_list_row.xml中为Relativelayout设置android:layout_height="wrap_content"
Since the height of the item is match_parent. it tries to take whole screen and push other items away.
try setting android:layout_height="wrap_content" for Relativelayout in settings_list_row.xml
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