我的布局有问题。我正在尝试做这样的事情：
现在，我有一个带有CardView的RecyclerView。在CardView我放了一个ImageView和一个TextView，但我不知道为什么但是CardView比它里面的ImageView更高。
这是代码和示例图像。
这是代码：活动
public class AddRoomActivity extends AppCompatActivity implements View.OnClickListener {
private View snackView;
private FloatingActionButton fabDoneAddRoom;
private EditText etRoomName;
private String roomName = null;
public final static String KEY_PI_IP = "MyPi_IP";
private final static String KEY_ROOM = "myRoom";
private final static String KEY_ROOM_TYPE = "myRoom_Type";
private RecyclerView typeRecyclerView;
private GridLayoutManager layoutManager;
private AddRoomActivity.TypeAdapter adapter;
private String myPi;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_room);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
fabDoneAddRoom = (FloatingActionButton) findViewById(R.id.doneAddRoom);
fabDoneAddRoom.setOnClickListener(this);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
etRoomName = (EditText) findViewById(R.id.addRoomName);
myPi = getIntent().getStringExtra(KEY_PI_IP);
layoutManager = new GridLayoutManager(this, 2);
typeRecyclerView = (RecyclerView) findViewById(R.id.recyclerTypeRoom);
typeRecyclerView.setHasFixedSize(true);
typeRecyclerView.setLayoutManager(layoutManager);
// specify an adapter (see also next example)
adapter = new TypeAdapter(getResources().getStringArray(R.array.roomTypeName));
typeRecyclerView.setAdapter(adapter);
}
void showToastMessage(String message) {
Snackbar.make(snackView, message, Snackbar.LENGTH_LONG).show();
}
@Override
public void onClick(View v) {
if (v.getId() == R.id.doneAddRoom) {
snackView = v;
String myString = etRoomName.getText().toString();
if (myString.length() > 0) {
roomName = myString.substring(0, 1).toUpperCase() + myString.substring(1);
addRoomToPi();
} else {
showToastMessage(getString(R.string.noNameRoom));
}
}
}
private void addRoomToPi() {
Integer ret = -1;
try {
ret = (Integer) new RaspberryTCPClient(myPi, getResources(), RaspberryTCPClient.TYPE_ADD_ROOM, roomName, XMLRoom.TYPE_KITCHEN_ROOM).execute().get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
if (ret == RaspberryTCPClient.OPERATION_DONE) {
showToastMessage(getString(R.string.roomAdded));
Intent data = new Intent();
data.putExtra(KEY_ROOM, roomName);
setResult(Activity.RESULT_OK, data);
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
finish();
}
}, 1500);
} else {
showToastMessage(getString(R.string.addRoomError));
}
}
private class TypeAdapter extends RecyclerView.Adapter<AddRoomActivity.TypeAdapter.ViewHolder> {
private String[] myData;
public TypeAdapter(String[] roomList) {
myData = roomList;
}
public void onItemClick(int position) {
}
public class ViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
public TextView tvType;
public CardView cvRoomCard;
public ImageView imgRoomType;
public ViewHolder(View vCard) {
super(vCard);
cvRoomCard = (CardView) vCard;
tvType = (TextView) vCard.findViewById(R.id.tvTypeName);
imgRoomType = (ImageView) vCard.findViewById(R.id.img_roomType);
}
}
@Override
public AddRoomActivity.TypeAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.type_room_recycler_view, parent, false);
// set the view's size, margins, paddings and layout parameters
//...
AddRoomActivity.TypeAdapter.ViewHolder vh = new AddRoomActivity.TypeAdapter.ViewHolder(v);
return vh;
}
@Override
public void onBindViewHolder(AddRoomActivity.TypeAdapter.ViewHolder holder, int position) {
// - get element from your dataset at this position
// - replace the contents of the view with that element
holder.tvType.setText(myData[position]);
switch (position) {
case XMLRoom.TYPE_ROOM:
holder.imgRoomType.setImageResource(R.drawable.img_room_sqr);
break;
case XMLRoom.TYPE_BED_ROOM:
holder.imgRoomType.setImageResource(R.drawable.img_bedroom_sqr);
break;
case XMLRoom.TYPE_GARDEN_ROOM:
holder.imgRoomType.setImageResource(R.drawable.img_garden_sqr);
break;
case XMLRoom.TYPE_KITCHEN_ROOM:
holder.imgRoomType.setImageResource(R.drawable.img_kitchen_sqr);
break;
case XMLRoom.TYPE_LIVING_ROOM:
holder.imgRoomType.setImageResource(R.drawable.img_living_room_sqr);
break;
case XMLRoom.TYPE_SWIMMING_POOL_ROOM:
holder.imgRoomType.setImageResource(R.drawable.img_swimming_pool_sqr);
break;
}
holder.cvRoomCard.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
onItemClick(position);
}
});
}
@Override
public int getItemCount() {
return myData.length;
}
}
MainLayout
<android.support.design.widget.AppBarLayout
android:id="@+id/appBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="@dimen/toolbar"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="90dp"
android:layout_marginTop="@dimen/toolbar"
android:descendantFocusability="beforeDescendants"
android:focusableInTouchMode="true">
<TextView
android:id="@+id/tvAddRoom"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_margin="5dp"
android:gravity="center"
android:text="@string/textAddRoom"
android:textColor="@color/primary_text"
android:textSize="20dp"
android:textStyle="bold" />
<android.support.design.widget.TextInputLayout
android:id="@+id/inputaddRoomName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/tvAddRoom"
android:layout_gravity="center"
android:layout_margin="5dp">
<EditText
android:id="@+id/addRoomName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="@string/prompt_RoomName"
android:inputType="textEmailAddress"
android:maxLines="1"
android:singleLine="true" />
</android.support.design.widget.TextInputLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerTypeRoom"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@id/inputaddRoomName"
android:scrollbars="vertical" />
</RelativeLayout>
<android.support.design.widget.FloatingActionButton
android:id="@+id/doneAddRoom"
android:layout_width="@dimen/fab_Dimension"
android:layout_height="@dimen/fab_Dimension"
android:layout_gravity="bottom|center"
android:layout_margin="@dimen/fab_margin"
app:srcCompat="@drawable/ic_done" />
</android.support.design.widget.CoordinatorLayout>
和视图布局：
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/card_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
card_view:cardCornerRadius="4dp">
<ImageView
android:id="@+id/img_roomType"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:src="@drawable/img_room" />
<TextView
android:id="@+id/tvTypeName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:gravity="center"
android:textColor="@android:color/white"
android:textSize="20sp" />
</android.support.v7.widget.CardView>
如果以后URL变为无效并节省时间，则从已接受的答案中提取所需信息。
GridLayoutManager用于以网格方式而不是列表显示RecyclerView。
RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(this, 2);
recyclerView.setLayoutManager(mLayoutManager);
您可以简单地使用此代码
<android.support.v7.widget.RecyclerView
app:layoutManager="android.support.v7.widget.GridLayoutManager"
app:spanCount="2"/>
使用androidX库只需：
<androidx.recyclerview.widget.RecyclerView
app:layoutManager="androidx.recyclerview.widget.GridLayoutManager"
app:spanCount="2"/>