android设置控件宽度自适应,自定义ImageView 宽度自适应屏幕，高度等比缩放

实现方法很简单，根据图片文件的宽度与ImageView的宽度比例关系算出ImageView的高度。

package com.etongwl.commonlibs.view;

import android.annotation.SuppressLint;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.drawable.BitmapDrawable;

import android.graphics.drawable.Drawable;

import android.graphics.drawable.NinePatchDrawable;

import android.util.AttributeSet;

import android.view.ViewGroup;

import android.widget.ImageView;

/*

* @Override

public void setImageDrawable(final Drawable drawable) {

super.setImageDrawable(drawable);

if (drawable != null) {

post(new Runnable() {

@Override public void run() {

float mWidth = getWidth();

float pWidth = drawable.getBounds().width();

float pHeight = drawable.getBounds().height();

int mHeight = (int) ((mWidth / pWidth) * pHeight);

LayoutParams params = getLayoutParams();

params.height = mHeight;

params.width = (int) mWidth;

setLayoutParams(params);

}

});

}

}

首先, 如果drawable不为空, 则通过drawable.getBounds()去获取drawable边界的宽和高. 在根据ImageView的宽与drawable的宽的比例去计算高度, 最后通过LayoutParams设置ImageView的高度

*

*/

/*

android:id="@+id/detail_image"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android: