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| # GridLayout | ||
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| 参考： https://www.jianshu.com/p/441d60be7d8a | ||
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| GridLayout的每一项宽高只能是： | ||
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| wrap_content； | ||
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| 一个写死的xxdp值； | ||
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| 根据设置的column平分； | ||
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| 但是项目需要适配好一点的话，最好可以动态设置宽高。 | ||
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| ```java | ||
| setLayoutManager(new GridLayoutManager(this, columeNum)); | ||
| ``` | ||
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| 这样宽可以自动均分了； | ||
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| 高度是测量第1行中所有子View的高，取最大值作为该行的高，如果该行没有子View，行高设为0。 | ||
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| > GridLayout的子View不需要设置layout_width和layout_height属性，因为GridLayout会把所有的子View的这两个属性设置为WRAP_CONTENT，所以你设置了也没有用。 | ||
| 1. 高度跟宽一样 | ||
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| 在子view的onMeasure里面把宽高设成一样 | ||
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| ```xml | ||
| <com.moos.launcher.CustomConstraintlayout | ||
| xmlns:android="http://schemas.android.com/apk/res/android" | ||
| xmlns:app="http://schemas.android.com/apk/res-auto" | ||
| android:layout_width="match_parent" | ||
| android:layout_height="match_parent" | ||
| android:background="@android:color/transparent"> | ||
| ... | ||
| </com.moos.launcher.CustomConstraintlayout> | ||
| ``` | ||
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| ```java | ||
| package com.moos.launcher; | ||
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| import android.content.Context; | ||
| import android.util.AttributeSet; | ||
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| import androidx.constraintlayout.widget.ConstraintLayout; | ||
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| public class CustomConstraintlayout extends ConstraintLayout { | ||
| public CustomConstraintlayout(Context context) { | ||
| super(context); | ||
| } | ||
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| public CustomConstraintlayout(Context context, AttributeSet attrs) { | ||
| super(context, attrs); | ||
| } | ||
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| public CustomConstraintlayout(Context context, AttributeSet attrs, int defStyleAttr) { | ||
| super(context, attrs, defStyleAttr); | ||
| } | ||
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| /** | ||
| * set height the same size with height; | ||
| * gridlayout计算子view最大高度，设置为这一行的高度； | ||
| * 但是这里希望直接设置为跟宽度一样，而不用依赖子view的高度； | ||
| * 这样子view可以用constraintlayout，根据父view的高度来布局 | ||
| * 所有的布局都不需要写dp值，只写比例值即可 | ||
| * @param widthMeasureSpec | ||
| * @param heightMeasureSpec | ||
| */ | ||
| @Override | ||
| protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { | ||
| super.onMeasure(widthMeasureSpec, widthMeasureSpec); | ||
| setMeasuredDimension(getMeasuredWidth(), getMeasuredWidth()); | ||
| } | ||
| } | ||
| ``` | ||
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| 2. 高度根据父view的高度均分 | ||
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| Adatper中设置子view的子view的高度 | ||
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| >为什么不设置子view, 因为上面说了，子view不管设置成什么，结果都是wrap_content | ||
| ```xml | ||
| <androidx.constraintlayout.widget.ConstraintLayout | ||
| xmlns:android="http://schemas.android.com/apk/res/android" | ||
| android:layout_width="match_parent" | ||
| android:layout_height="match_parent" | ||
| xmlns:app="http://schemas.android.com/apk/res-auto"> | ||
| <androidx.constraintlayout.widget.ConstraintLayout | ||
| android:id="@+id/max_height_view" | ||
| android:layout_width="match_parent" | ||
| android:layout_height="match_parent" | ||
| app:layout_constraintLeft_toLeftOf="parent" | ||
| app:layout_constraintRight_toRightOf="parent" | ||
| app:layout_constraintTop_toTopOf="parent" | ||
| app:layout_constraintBottom_toBottomOf="parent"> | ||
| ... </androidx.constraintlayout.widget.ConstraintLayout> | ||
| </androidx.constraintlayout.widget.ConstraintLayout> | ||
| ``` | ||
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| ```java | ||
| @NonNull | ||
| @Override | ||
| public XXXViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { | ||
| View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.XXX_item, null); | ||
| View maxHeightView = view.findViewById(R.id.max_height_view); | ||
| ConstraintLayout.LayoutParams layoutParams = (ConstraintLayout.LayoutParams) maxHeightView.getLayoutParams(); | ||
| layoutParams.height = mRecyclerView.getHeight() / 3; | ||
| // 这里设置成父view的1/3 | ||
| maxHeightView.setLayoutParams(layoutParams); | ||
| return new XXXViewHolder(view); | ||
| } | ||
| ``` | ||
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