我尝试创建一个自定义LinearLayout,它将像网格一样工作。我成功地这样做了,并有我想要的方面,但我仍然有问题。当我只有一行时。我想将我的自定义布局的layout_height属性从wrap_content更改为march_parent以便能够将将创建的唯一LinearLayout居中。Android自定义LinearLayout:getParams返回null
所以现在我我的代码是在onFinishInflate方法之后演技,但我在这里有一个问题,我不能得到的LayoutParams因为该值是空的,当我试图把我自己的新参数,可以是不工作:
setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
这里是我的代码:
import android.content.Context;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import java.util.ArrayList;
public class GameGridLayout extends LinearLayout {
private Context context;
private int currentRow = -1, maxRowItems = 3;
private ArrayList<LinearLayout> layouts = new ArrayList<>();
public GameGridLayout(Context context) {
super(context);
this.context = context;
}
public GameGridLayout(Context context, AttributeSet attrs) {
super(context, attrs);
this.context = context;
}
public GameGridLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.context = context;
}
private ArrayList<View> getViews() {
int nbChilds = getChildCount();
ArrayList<View> views = new ArrayList<>();
for (int i = 0; i < nbChilds; i++) {
views.add(getChildAt(i));
}
return views;
}
private void reorganizeViews(Context context) {
ArrayList<View> views = getViews();
if(views.size() == 4) maxRowItems = 2;
for (int i = 0; i < views.size(); i++) {
if(i % maxRowItems == 0) {
LinearLayout currentLayout = new LinearLayout(context);
layouts.add(currentLayout);
currentRow++;
}
View currentChild = views.get(i);
if(currentChild != null) {
removeView(currentChild);
layouts.get(currentRow).addView(currentChild);
}
}
for (int i = 0; i < layouts.size(); i++) {
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
layouts.get(i).setLayoutParams(params);
layouts.get(i).setOrientation(HORIZONTAL);
layouts.get(i).setWeightSum(3);
layouts.get(i).setGravity(Gravity.CENTER);
addView(layouts.get(i));
}
setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
reorganizeViews(context);
}
}
如果你知道是谁做的,我看到,如果我用的是充气的方法,我也许可以有我想要的结果,但我不不知道该怎么做,例如:
inflate(context, ??, this);
我没有任何XML膨胀,所以...
是的,我完成了这样做,只是创建一个简单的方法setLayoutParams和我的onCreate我调用该方法。它的优点是很容易^ _ ^。谢谢 – zed13