问题
I am having a bottom tabbed activity with three fragments Home, Dashboard and Notifications. In the first fragment, I am having 4 layouts with a button in each layout. These 4 layouts are aligned ina grid view having positions as column:rows (1:1 1:2 2:1 2:2) while in portrait orientation.
But how to auto-arrange these layouts when in landscape mode i.e. either as (1:1 1:2 1:3 1:4) based on the horizontal area available during landscape?
Xml File
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:grid2="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center">
<ScrollView
android:id="@+id/scroll"
android:layout_marginTop="10dp"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.gridlayout.widget.GridLayout
android:id="@+id/container2"
android:layout_width="match_parent"
android:background="#00555555"
android:layout_height="wrap_content"
android:paddingTop="?attr/actionBarSize"
grid2:alignmentMode="alignBounds"
grid2:columnCount="2"
android:numColumns="auto_fit"
android:stretchMode="columnWidth"
grid2:rowOrderPreserved="false">
<LinearLayout
android:id="@+id/layout1"
android:layout_width="180dp"
android:layout_height="170dp"
android:background="@drawable/circle_shape"
android:gravity="center"
android:orientation="vertical"
android:text="TextView"
grid2:layout_column="0"
grid2:layout_gravity="center"
grid2:layout_row="0">
<Button
android:id="@+id/but1"
android:layout_width="55dp"
android:layout_height="56dp"
android:layout_gravity="center"
android:background="@drawable/button1"
android:layout_marginTop="20dp"
grid2:layout_gravity="left" />
<TextView
android:id="@+id/tv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="8dp"
android:text="@string/control"
android:textSize="22sp"
android:textStyle="italic" />
<TextView
android:id="@+id/tv2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:textColor="#25F325"
android:text="@string/no_status"
android:textSize="14sp" />
</LinearLayout>
<LinearLayout
android:id="@+id/layout2"
android:layout_width="180dp"
android:layout_height="170dp"
android:layout_marginEnd="20dp"
android:background="@drawable/circle_shape"
android:gravity="center"
android:orientation="vertical"
grid2:layout_column="1"
grid2:layout_gravity="center_horizontal"
grid2:layout_row="0">
<Button
android:id="@+id/but2"
android:layout_width="55dp"
android:layout_height="56dp"
android:layout_marginTop="10dp"
android:layout_gravity="center"
android:background="@drawable/button2" />
<TextView
android:id="@+id/tv4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="10dp"
android:textStyle="italic"
android:textSize="21sp" />
<TextView
android:id="@+id/tv5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginBottom="10dp"
android:text="@string/no_data"
android:textColor="#25F325"
android:textSize="14sp" />
</LinearLayout>
<LinearLayout
android:id="@+id/layout3"
android:layout_width="180dp"
android:layout_height="170dp"
android:layout_marginStart="20dp"
android:layout_marginEnd="10dp"
android:background="@drawable/circle_shape"
android:gravity="center"
android:orientation="vertical"
grid2:layout_column="0"
grid2:layout_gravity="center"
grid2:layout_row="1">
<Button
android:id="@+id/but3"
android:layout_marginTop="0dp"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_gravity="center"
android:background="@drawable/img1" />
<TextView
android:id="@+id/tv6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="10dp"
android:text="Fire"
android:textSize="21sp"
android:textStyle="italic" />
<TextView
android:id="@+id/tv7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="@string/no_data"
android:textColor="#25F325"
android:textSize="14sp" />
</LinearLayout>
<LinearLayout
android:id="@+id/layout4"
android:layout_width="180dp"
android:layout_height="170dp"
android:layout_marginTop="10dp"
android:layout_marginEnd="20dp"
android:background="@drawable/circle_shape"
android:gravity="center"
android:orientation="vertical"
android:text="TextView"
grid2:layout_column="1"
grid2:layout_gravity="center"
grid2:layout_row="1">
<Button
android:id="@+id/but4"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_gravity="center"
android:background="@drawable/gas1" />
<TextView
android:id="@+id/tv8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="10dp"
android:text="Gas"
android:textSize="21sp"
android:textStyle="italic" />
<TextView
android:id="@+id/tv9"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:textColor="#25F325"
android:text="@string/no_data
android:textSize="14sp" />
</LinearLayout>
</androidx.gridlayout.widget.GridLayout>
</ScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>
Home Fragment Class
package com.example.qnorb.ui.home;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProviders;
import com.example.qnorb.R;
public class HomeFragment extends Fragment implements View.OnClickListener{
private HomeViewModel homeViewModel;
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
homeViewModel = ViewModelProviders.of(this).get(HomeViewModel.class);
View root = inflater.inflate(R.layout.fragment_home, container, false);
// textView = root.findViewById(R.id.lights);
homeViewModel.getText().observe(this, new Observer<String>() {
@Override
public void onChanged(@Nullable String s) {
}
});
return root;
}
@Override
public void onClick(View view) {
}
}
Home View Model Class
package com.example.qnorb.ui.home;
import androidx.lifecycle.LiveData;
import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.ViewModel;
public class HomeViewModel extends ViewModel {
private MutableLiveData<String> mText;
public HomeViewModel() {
mText = new MutableLiveData<>();
}
public LiveData<String> getText() {
return mText;
}
}
回答1:
Target API 13+:
Set the android:configChanges flag in your Activity in manifest.xml
<activity
android:name="com.test.activity.MainActivity"
android:configChanges="orientation|screenSize|keyboardHidden"/>
回答2:
You need to have two different layouts for portrait and landscape orientation.
it should be named same name, but in different layout directories:
layout dir where your current layout is for Portrait orientation.
Now create layout-land directory, copy same layout and refactor it with same view id's just different positions.
It should look like this:
回答3:
I would suggest use RecyclerView pattern with different spanCount after rotation configuration changes.
Also you can calculate span count by screen width or whatever.
So basically in onCreate(), set new GridLayoutManager(context, GRID_SPAN_COUNT_BY_ROTATION) in toRecyclerView
it should look like this in your fragment:
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
homeViewModel = ViewModelProviders.of(this).get(HomeViewModel.class);
View root = inflater.inflate(R.layout.fragment_home, container, false);
RecyclerView recyclerView = root.findViewById(R.id.your_recyclerview);
// set span count by orientation
int orientation = getResources().getConfiguration().orientation;
int spanCount;
if (orientation == Configuration.ORIENTATION_PORTRAIT) {
// code for portrait mode
spanCount = 4;
} else {
// code for landscape mode
spanCount = 9;
}
// set GridLayoutManager with custom span count
recyclerView.setLayoutManager(new GridLayoutManager(context, spanCount));
homeViewModel.getText().observe(this, new Observer<String>() {
@Override
public void onChanged(@Nullable String s) {
}
});
return root;
}
if it is not working then do not forget to change manifest config rules like mentioned in another answer.
来源：https://stackoverflow.com/questions/61201429/how-to-re-position-the-grid-layout-elements-in-fragments-on-orientation-change