android framelayout 高度,Android自定义View——可以设置最大宽高的FrameLayout

可以设置最大宽高的FrameLayout

支持相对父控件的半分比设置

默认优先比例设置

不支持参数小于零

MaxLayout.java

import android.util.DisplayMetrics;

import android.view.ViewGroup;

import android.widget.FrameLayout;

import android.content.Context;

import android.content.res.TypedArray;

import android.util.AttributeSet;

import android.view.WindowManager;

/**

* Created by wangxingsheng on 2018/6/8.

*

* 可以设置最大宽高的FrameLayout

* 默认优先比例设置

* 不支持参数小于零

*

*/

public class MaxLayout extends FrameLayout {

private float mMaxHeightRatio = -1f;// 优先级高

private float mMaxHeight = -1f;// 优先级低

private float mMaxWidthRatio = -1f;// 优先级高

private float mMaxWidth = -1f;// 优先级低

private int parentWidth;

private int parentHeight;

private boolean firstHeightRatio = true;//高默认优先比例设置

private boolean firstWidthRatio = true;//宽默认优先比例设置

public MaxLayout(Context context) {

super(context);

}

public MaxLayout(Context context, AttributeSet attrs) {

super(context, attrs);

initAttrs(context, attrs);

}

public MaxLayout(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

initAttrs(context, attrs);

}

private void initAttrs(Context context, AttributeSet attrs) {

TypedArray a = context.obtainStyledAttributes(attrs,

R.styleable.MaxLayout);

if(a!=null){

firstHeightRatio = a.getBoolean(R.styleable.MaxLayout_first_ratio_height,true);

firstWidthRatio = a.getBoolean(R.styleable.MaxLayout_first_ratio_width,true);

mMaxHeightRatio = a.getFloat(R.styleable.MaxLayout_max_height_ratio, -1f);

mMaxHeight = a.getDimension(R.styleable.MaxLayout_max_height, -1f);

mMaxWidthRatio = a.getFloat(R.styleable.MaxLayout_max_width_ratio, -1f);

mMaxWidth = a.getDimension(R.styleable.MaxLayout_max_width, -1f);

a.recycle();

}

}

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

initParentWH();

initWH();

int heightMode = MeasureSpec.getMode(heightMeasureSpec);

int heightSize = MeasureSpec.getSize(heightMeasureSpec);

int maxHeightMeasureSpec = MeasureSpec.makeMeasureSpec(heightSize <= mMaxHeight ? heightSize : (int) mMaxHeight, heightMode);

int widthMode = MeasureSpec.getMode(widthMeasureSpec);

int widthSize = MeasureSpec.getSize(widthMeasureSpec);

int maxWidthMeasureSpec = MeasureSpec.makeMeasureSpec(widthSize <= mMaxWidth ? widthSize : (int) mMaxWidth, widthMode);

super.onMeasure(maxWidthMeasureSpec, maxHeightMeasureSpec);

}

/**

* 计算需要设置的宽高

*/

private void initWH() {

if((firstHeightRatio && mMaxHeightRatio > 0)

|| (!firstHeightRatio && mMaxHeight < 0)){

mMaxHeight = mMaxHeightRatio * parentHeight;

}

if((firstWidthRatio && mMaxWidthRatio > 0)

|| (!firstWidthRatio && mMaxWidth < 0)){

mMaxWidth = mMaxWidthRatio * parentWidth;

}

}

/**

* 获取父控件的宽高

*/

private void initParentWH() {

ViewGroup parent = (ViewGroup) getParent();

if(null != parent){

parentWidth = parent.getWidth();

parentHeight = parent.getHeight();

}else {

WindowManager wm = (WindowManager) getContext()

.getSystemService(Context.WINDOW_SERVICE);

DisplayMetrics dm = new DisplayMetrics();

if (wm != null) {

wm.getDefaultDisplay().getMetrics(dm);

parentWidth = dm.widthPixels;

parentHeight = dm.heightPixels;

}

}

}

}

attrs.xml