我正在开发一个项目，我的工作部分是在主屏幕上创建一个滑动布局，当应用程序启动时，它将部分显示在底部，我们可以滚动该布局。然后我必须在其中添加子视图，这将是卡片。为此，我创建了一个自定义FrameLayout，我将以编程方式添加它们。
我已成功完成任务的大部分工作。
我为滑动布局创建了一个自定义<?xml version="1.0" encoding="utf-8"?>
<com.dhrumil.airhockey.OverflowView
xmlns:android="http://schemas.android.com/apk/res/android"
android:background="@drawable/layer_list"
android:padding="5dp"
android:layout_height="match_parent"/>
。
然后我使用它并以XML格式添加。
MyCardView之后我创建了一个名为ViewGroup的java类，它会释放public class MyCardView extends ViewGroup {
public MyCardView(Context context){
super(context);
init(context);
}
public MyCardView(Context context, AttributeSet attrs){
super(context,attrs);
init(context);
}
public MyCardView(Context context, AttributeSet attrs, int defStyleAttr){
super(context, attrs,defStyleAttr);
init(context);
}
public MyCardView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
init(context);
}
public void init(Context context){
}
@Override
protected void onLayout(boolean b, int l, int i1, int i2, int i3) {
// TODO Auto-generated method stub
final int count = getChildCount();
int curWidth, curHeight, curLeft, curTop, maxHeight;
//get the available size of child view
int childLeft = this.getPaddingLeft();
int childTop = this.getPaddingTop();
int childRight = this.getMeasuredWidth() - this.getPaddingRight();
int childBottom = this.getMeasuredHeight() - this.getPaddingBottom();
int childWidth = childRight - childLeft;
int childHeight = childBottom - childTop;
maxHeight = 0;
curLeft = childLeft;
curTop = childTop;
//walk through each child, and arrange it from left to right
for (int i = 0; i < count; i++) {
View child = getChildAt(i);
if (child.getVisibility() != GONE) {
//Get the maximum size of the child
child.measure(MeasureSpec.makeMeasureSpec(childWidth, MeasureSpec.AT_MOST),
MeasureSpec.makeMeasureSpec(childHeight, MeasureSpec.AT_MOST));
curWidth = child.getMeasuredWidth();
curHeight = child.getMeasuredHeight();
//wrap is reach to the end
if (curLeft + curWidth >= childRight) {
curLeft = childLeft;
curTop += maxHeight;
maxHeight = 0;
}
//do the layout
child.layout(curLeft, curTop, curLeft + curWidth, curTop + curHeight);
//store the max height
if (maxHeight < curHeight)
maxHeight = curHeight;
curLeft += curWidth;
}
}
}
}
。
MyCardView然后我尝试以编程方式将FrameLayout的对象添加到我的自定义onCreate()中。
这是完成任务的ViewGroup内部的方法。这是将两个自定义LinearLayout添加到一个public void setupText(){
FrameLayout frame = (FrameLayout) findViewById(R.id.overflow_frame);
LinearLayout linearLayout = new LinearLayout(getBaseContext());
linearLayout.setOrientation(LinearLayout.VERTICAL);
ViewGroup vg = new MyCardView(getBaseContext());
ViewGroup.MarginLayoutParams layoutParams = new ViewGroup.MarginLayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,200);
vg.setBackgroundColor(Color.WHITE);
ViewCompat.setElevation(vg, 5);
TextView tvTemp = new TextView(getBaseContext());
tvTemp.setTextColor(Color.BLACK);
tvTemp.setText("Hello There");
vg.addView(tvTemp);
ViewGroup vg1 = new MyCardView(getBaseContext());
ViewGroup.MarginLayoutParams layoutParams1 = new ViewGroup.MarginLayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,200);
layoutParams1.setMargins(0,10,0,0);
vg1.setBackgroundColor(Color.WHITE);
ViewCompat.setElevation(vg1, 5);
TextView tvTemp1 = new TextView(getBaseContext());
tvTemp1.setTextColor(Color.BLACK);
tvTemp1.setText("Hello There 2");
vg1.addView(tvTemp1);
linearLayout.addView(vg,layoutParams);
linearLayout.addView(vg1,layoutParams1);
frame.addView(linearLayout);
}
。
{{1}}
现在发生的事情是我试图设置ViewGroup的边距，但似乎并不适用。请帮助。
答案 0 :(得分：2)
我正在做的错误是，在我的代码中，我声明了ViewGroup.MarginLayoutParams layoutParams1的实例，我在linearLayout.addView(vg1,layoutParams1)中传递相同的实例，但方法addView()接受View }作为第一个参数，LayoutParams的实例作为第二个参数。
所以我认为那是问题（不完全确定）。所以我将代码更改为
LinearLayout.LayoutParams layoutParams1 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,200);