android - 安卓的背景图选用的图片像素应该用多少？

问题描述

就是一个APP，引导页写了三个layout,分别放了三张图片

<?xml version='1.0' encoding='utf-8'?><RelativeLayout xmlns:android='http://schemas.android.com/apk/res/android' android:layout_width='match_parent' android:layout_height='match_parent' android:orientation='vertical' > <ImageViewandroid:layout_width='match_parent'android:layout_height='match_parent'android:scaleType='centerCrop'android:src='https://www.6hehe.com/wenda/@drawable/guideimg1'/></RelativeLayout>

第一次启动的时候显示引导页，然后在进入登录的页面，登录的界面也设置了一张背景图

<?xml version='1.0' encoding='utf-8'?><RelativeLayout xmlns:android='http://schemas.android.com/apk/res/android' android:orientation='vertical' android:layout_width='match_parent' android:layout_height='match_parent' android:paddingBottom='@dimen/activity_vertical_margin' android:paddingLeft='@dimen/activity_horizontal_margin' android:paddingRight='@dimen/activity_horizontal_margin' android:paddingTop='@dimen/activity_vertical_margin' android:weightSum='1' android:background='@drawable/login_background'> <Buttonandroid:layout_width='match_parent'android:layout_height='50dp'android:text='微信登录'android:textColor='#fff'android:textSize='23dp'android: android:drawableLeft='@mipmap/ic_wechat'android:drawablePadding='-95dp'android:paddingLeft='95dp'android:background='@drawable/button_style_login'android:layout_gravity='center_horizontal'android:layout_alignParentBottom='true'android:layout_alignParentLeft='true'android:layout_alignParentStart='true'android:layout_centerHorizontal='true'android:layout_marginBottom='15dp'android:elevation='21dp' /></RelativeLayout>

但如果背景图的像素设成750*1344，然后到登录界面程序就崩了，内存溢出的错

java.lang.OutOfMemoryError android.graphics.BitmapFactory.nativeDecodeAsset(Native Method) android.graphics.BitmapFactory.decodeStream(BitmapFactory.java) android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java) android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java) android.content.res.Resources.loadDrawable(Resources.java) android.content.res.Resources.getDrawable(Resources.java) android.support.v4.content.ContextCompat.getDrawable(ContextCompat.java:346) android.support.v7.widget.AppCompatDrawableManager.getDrawable(AppCompatDrawableManager.java:197) android.support.v7.widget.AppCompatDrawableManager.getDrawable(AppCompatDrawableManager.java:185) android.support.v7.content.res.AppCompatResources.getDrawable(AppCompatResources.java:100) android.support.v7.view.menu.MenuItemImpl.getIcon(MenuItemImpl.java:421) android.support.design.internal.NavigationMenuItemView.initialize(NavigationMenuItemView.java:113) android.support.design.internal.NavigationMenuPresenter$NavigationMenuAdapter.onBindViewHolder(NavigationMenuPresenter.java:415) android.support.design.internal.NavigationMenuPresenter$NavigationMenuAdapter.onBindViewHolder(NavigationMenuPresenter.java:338) android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5825) android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:5858) android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5094) android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4970) android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2029) android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1414) android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1377) android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:578) android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3315) android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3124) android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3568) android.view.View.layout(View.java) android.view.ViewGroup.layout(ViewGroup.java) android.widget.FrameLayout.layoutChildren(FrameLayout.java) android.widget.FrameLayout.onLayout(FrameLayout.java) android.view.View.layout(View.java) android.view.ViewGroup.layout(ViewGroup.java) android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:1221) android.view.View.layout(View.java) android.view.ViewGroup.layout(ViewGroup.java) android.widget.FrameLayout.layoutChildren(FrameLayout.java) android.widget.FrameLayout.onLayout(FrameLayout.java) android.view.View.layout(View.java) android.view.ViewGroup.layout(ViewGroup.java) android.widget.LinearLayout.setChildFrame(LinearLayout.java) android.widget.LinearLayout.layoutVertical(LinearLayout.java) android.widget.LinearLayout.onLayout(LinearLayout.java) android.view.View.layout(View.java) android.view.ViewGroup.layout(ViewGroup.java) android.widget.FrameLayout.layoutChildren(FrameLayout.java) android.widget.FrameLayout.onLayout(FrameLayout.java) android.view.View.layout(View.java) android.view.ViewGroup.layout(ViewGroup.java) android.widget.LinearLayout.setChildFrame(LinearLayout.java) android.widget.LinearLayout.layoutVertical(LinearLayout.java) android.widget.LinearLayout.onLayout(LinearLayout.java)

将登录界面的像素调小写就不报错了

我想问一下这种问题应该怎么处理，图片的像素设成多少比较合适？

问题解答

典型的drawable文件夹带来的问题，建议是UI只出一套高清无码大图放在xxh-dpi文件夹中，当在分辨率低的手机上运行时，会自动按照比例加载图片，不会出现OOM的问题。直接放在drawable下，默认是适配低分辨率，手机为高分辨率时，会按比例放大，OOM没得商量的。

你这是放在哪个drawable 文件夹下，这个尺寸有点怪异。建议放到 deawable-xxhdpi 文件夹

就是drawable文件夹的问题，drawable目录下的图片会根据xdpi,xxdpi之类的级别进行比例调整，如果放在drawable下好像是最低级别。换句话说，如果你手机是1920x1080，实际图片尺寸至少是你图片的三倍。

http://blog.csdn.net/guolin_b...郭霖大神详细解释过