I have been confused about the problem for a week. The pictures in the imageview are returned by the backend, including the width and height of the returned pictures. I started to use the layoutparams code to set it. I don’t know why it didn’t take effect, and then I forgot to optimize it. On the eve of the launch, the product proposed this optimization point and was confused. What I thought at the time was whether there might be a problem with the pictures returned by the backend (the product said that ios is good). . . . Speechless (I'm too skilled)
I can't bite the bullet and do it
<ImageView
android:id="@+id/dod_image"
android:layout_width="@dimen/dp_73"
android:layout_height="@dimen/dp_29"
android:background="@drawable/drawable_dod_backgroud"
android:paddingVertical="@dimen/dp_7"
android:paddingHorizontal="@dimen/dp_9"
android:scaleType="fitCenter"
android:adjustViewBounds="true"
app:layout_constraintTop_toTopOf="@id/iv_class_bg"
app:layout_constraintStart_toStartOf="@id/iv_class_bg"
/>
scaleType
Most of the Internet uses this method. I also set it up, but it doesn’t work. I feel that I still have to set it from the code, so I called layoutParams again.
holder.getView<ImageView>(R.id.dod_image)?.apply {
//layoutParams的单位为px 后端返回的为dp，需要借助ScreenUtils转换
var params=this.layoutParams
params.height=bean.gradeImgHeight
params.width= bean.gradeImgWidth
this.layoutParams=params
}
This is the code written by the first reaction, I rely on it! ! ! No way, the displayed picture is just a little bit,
why is this, I can’t figure it out, so I set the width and height in xml to 0, and set the width and height in layoutparams to the width and height given by ui , Good guy, it still doesn’t work, but it’s obvious that the layoutparams didn’t take effect, but the value is wrong, so I opened the layoutparams source code again and
found the reason
The unit of layoutparamt is px! ! ! ! ! not dp
holder.getView<ImageView>(R.id.dod_image)?.apply {
//layoutParams的单位为px 后端返回的为dp，需要借助ScreenUtils转换
var params=this.layoutParams
params.height=com.app.hubert.guide.util.ScreenUtils.dp2px(context,bean.gradeImgHeight+14)
params.width= com.app.hubert.guide.util.ScreenUtils.dp2px(context,bean.gradeImgWidth+18)
this.layoutParams=params
}
Just convert it with the help of a conversion tool
package com.app.hubert.guide.util;
import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Point;
import android.os.Build;
import android.util.DisplayMetrics;
import android.view.Display;
import android.view.KeyCharacterMap;
import android.view.KeyEvent;
import android.view.ViewConfiguration;
/**
* Created by hubert
* <p>
* Created on 2017/7/27.
*/
public class ScreenUtils {
private ScreenUtils() {
throw new AssertionError();
}
/**
* dp单位转成px
*
* @param context context
* @param dp dp值
* @return px值
*/
public static int dp2px(Context context, int dp) {
return (int) (dp * context.getResources().getDisplayMetrics().density);
}
/**
* 获取屏幕宽度
*/
public static int getScreenWidth(Context context) {
DisplayMetrics dm = context.getResources().getDisplayMetrics();
return dm.widthPixels;
}
/**
* 获取屏幕高度
*/
public static int getScreenHeight(Context context) {
DisplayMetrics dm = context.getResources().getDisplayMetrics();
return dm.heightPixels;
}
/**
* 获取状态栏高度
*/
public static int getStatusBarHeight(Context context) {
// 一般是25dp
int height = dp2px(context, 20);
LogUtil.i("common statusBar height:" + height);
//获取status_bar_height资源的ID
int resourceId = context.getResources().getIdentifier("status_bar_height", "dimen", "android");
if (resourceId > 0) {
height = context.getResources().getDimensionPixelSize(resourceId);
LogUtil.i("real statusBar height:" + height);
}
LogUtil.i("finally statusBar height:" + height);
return height;
}
/**
* 虚拟操作拦（home等）是否显示
*/
public static boolean isNavigationBarShow(Activity activity) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
Display display = activity.getWindowManager().getDefaultDisplay();
Point size = new Point();
Point realSize = new Point();
display.getSize(size);
display.getRealSize(realSize);
return realSize.y != size.y;
} else {
boolean menu = ViewConfiguration.get(activity).hasPermanentMenuKey();
boolean back = KeyCharacterMap.deviceHasKey(KeyEvent.KEYCODE_BACK);
if (menu || back) {
return false;
} else {
return true;
}
}
}
/**
* 获取虚拟操作拦（home等）高度
*/
public static int getNavigationBarHeight(Activity activity) {
if (!isNavigationBarShow(activity))
return 0;
int height = 0;
Resources resources = activity.getResources();
//获取NavigationBar的高度
int resourceId = resources.getIdentifier("navigation_bar_height", "dimen", "android");
if (resourceId > 0)
height = resources.getDimensionPixelSize(resourceId);
LogUtil.i("NavigationBar的高度:" + height);
return height;
}
}
This is a tool class, it’s okay, goodbye after complaining
at last
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