我想有一个2x2网格内的按钮。这只是ICS，所以我试图使用新的GridLayout给定。
这是我的布局的XML:
<?xml version="1.0" encoding="utf-8"?>
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/favorites_grid"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00ff00"
android:rowCount="2"
android:columnCount="2">
<Button
android:text="Cell 0"
android:layout_row="0"
android:layout_column="0"
android:textSize="14dip" />
<Button
android:text="Cell 1"
android:layout_row="0"
android:layout_column="1"
android:textSize="14dip" />
<Button
android:text="Cell 2"
android:layout_row="1"
android:layout_column="0"
android:textSize="14dip" />
<Button
android:text="Cell 3"
android:layout_row="1"
android:layout_column="1"
android:textSize="14dip" />
</GridLayout>
问题是我的视图没有为每一行均匀地拉伸。这导致GridLayout的右侧有很多额外的空间。
我尝试设置layout_gravity="fill_horizontal"，但这只适用于该行的最后一个视图。这意味着单元格1会一直延伸，为单元格0提供足够的空间。
如何解决这个问题?
main。xml
<GridLayout
android:id="@+id/grid_related_news"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:padding="3dp"
android:columnCount="2">
</GridLayout>
。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:layout_width="0dp"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_columnWeight="1"
android:gravity="center"
android:padding="3dp"
android:layout_gravity="fill_horizontal"
xmlns:android="http://schemas.android.com/apk/res/android">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/white"
app:cardBackgroundColor="@color/white"
app:cardCornerRadius="5dp"
app:cardElevation="2dp"
android:layout_margin="4dp">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/img_related_news"
android:layout_width="0dp"
android:layout_height="0dp"
android:layoutDirection="rtl"
android:scaleType="centerCrop"
app:layout_constraintDimensionRatio="H,1:1"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/light_gray" />
<LinearLayout
android:layout_width="0dp"
android:layout_height="0dp"
android:background="#59000000"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/txt_related_news_title"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="12dp"
android:layout_marginTop="6dp"
android:layout_marginEnd="12dp"
android:layout_marginBottom="12dp"
android:elevation="2dp"
android:fontFamily="@font/yekan_bold"
android:letterSpacing="-0.1"
android:lineSpacingExtra="4dp"
android:maxLines="4"
android:textColor="@color/white"
android:textSize="13sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
tools:text="@string/lorem_ipsum_sentence" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
</LinearLayout>
java
GridLayout grid_related_news = findViewById(R.id.grid_related_news);
View view = LayoutInflater.from(this).inflate(R.layout.related_item, (ViewGroup) grid_related_news, false);
ImageView img_related_news = view.findViewById(R.id.img_related_news);
...
grid_related_news.addView(view);
你可以用这个例子
我终于找到了解决办法。就像Rotemmiz说的，你必须在之后动态地做。这段代码拉伸按钮以水平填充视图，但同样可以用于垂直填充视图。
public void fillview(android.support.v7.widget.GridLayout gl)
{
Button buttontemp;
//Stretch buttons
int idealChildWidth = (int) ((gl.getWidth()-20*gl.getColumnCount())/gl.getColumnCount());
for( int i=0; i< gl.getChildCount();i++)
{
buttontemp = (Button) gl.getChildAt(i);
buttontemp.setWidth(idealChildWidth);
}
}
(20是内部和外部的填充和空白。这可以更普遍地做，但这个要干净得多)
然后可以这样调用:
android.support.v7.widget.GridLayout gl = (android.support.v7.widget.GridLayout)findViewById(R.id.buttongrid);
ViewTreeObserver vto = gl.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {@Override public void onGlobalLayout()
{
android.support.v7.widget.GridLayout gl = (android.support.v7.widget.GridLayout) findViewById(R.id.buttongrid);
fillview(gl);
ViewTreeObserver obs = gl.getViewTreeObserver();
obs.removeGlobalOnLayoutListener(this);
}});
它必须用一个观察者来完成，因为我们需要在调用视图之前等待视图被绘制。
给你:
Button button = new Button(this);
// weight = 1f , gravity = GridLayout.FILL
GridLayout.LayoutParams param= new GridLayout.LayoutParams(GridLayout.spec(
GridLayout.UNDEFINED,GridLayout.FILL,1f),
GridLayout.spec(GridLayout.UNDEFINED,GridLayout.FILL,1f));
// Layout_height = 0 ,Layout_weight = 0
params.height =0;
params.width = 0;
button.setLayoutParams(param);
你可以通过重写ViewGroup onLayout方法来提高速度。
这是我的普遍解决方案:
package your.app.package;
import android.content.Context;
import android.view.ViewGroup;
public class GridLayout extends ViewGroup {
public GridLayout(Context context) {
super(context);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
final int columns = 2;//edit this if you need different grid
final int rows = 2;
int children = getChildCount();
if (children != columns * rows)
throw new IllegalStateException("GridLayout must have " + columns * rows + " children");
int width = getWidth();
int height = getHeight();
int viewWidth = width / columns;
int viewHeight = height / rows;
int rowIndex = 0;
int columnIndex = 0;
for (int i = 0; i < children; i++) {
getChildAt(i).layout(viewWidth * columnIndex, viewHeight * rowIndex, viewWidth * columnIndex + viewWidth, viewHeight * rowIndex + viewHeight);
columnIndex++;
if (columnIndex == columns) {
columnIndex = 0;
rowIndex++;
}
}
}
}
编辑:
不要忘记match_parent for children!
android:layout_width="match_parent"
android:layout_height="match_parent"
