一分钟了解Android横竖屏 mdpi hdpi xhdpi xxhdpi xxxhdpi

DPI:每英寸像素数

简单的屏幕分辨率计算方法：

DisplayMetrics metrics = this.getResources().getDisplayMetrics();
float density = metrics.density;
int dpi = metrics.densityDpi;
int heightPixels = metrics.heightPixels;
int widthPixels = metrics.widthPixels;
Log.e("---metrics---", "比例:"+density+"dpi:"+dpi+"高像素:"+heightPixels+"宽像素:"+widthPixels);

图片大小适应不同屏幕：

img.post(new Runnable() {   @Overridepublic void run() {int spec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);img.measure(spec,spec);int measuredWidth=img.getMeasuredWidth();int measuredHeight=img.getMeasuredHeight();//原始大小  if (measuredWidth==0){return;  }    int width=img.getWidth();int height=img.getHeight();//真实大小    LinearLayout.LayoutParams lp=(LinearLayout.LayoutParams)img.getLayoutParams();lp.width=width;lp.height=width*(measuredHeight / measuredWidth);img.setLayoutParams(lp);//设置大小}});

dp与px计算图（mdpi 1dp=1px）：

ldpi:1dp=0.75px mdpi:1dp=1px hdpi:1dp=1.5px xhdpi:1dp=2px xxhdpi:1dp=3px xxxhdpi:1dp=4px

Android手机屏幕标准对应图标尺寸标准屏幕密度比例

xxxhdpi 3840*2160 192*192 640 16

xxhdpi 1920*1080 144*144 480 12

xhdpi 1280*720 96*96 320 8

hdpi 480*800 72*72 240 6

mdpi 480*320 48*48 160 4

ldpi 320*240 36*36 120 3

注：Android studio mipmap文件夹只存放启动图标icon

http://blog.csdn.net/a704755096/article/details/46342689

屏幕横竖屏布局切换：

1)单个布局xml直接横竖屏切换，不重新加载数据：android:configChanges="orientation|keyboardHidden|screenSize"

2)layout-land和layout-port布局横竖屏切换，不重新加载数据：FragmentActivity重写onRetainCustomNonConfigurationInstance()

Activity 重写onRetainNonConfigurationInstance()保存数据，在onCreate()时判断getLastNonConfigurationInstance()是否null:

Java代码

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Object data = getLastNonConfigurationInstance();
if (data == null) {
findviewbyidLoadMyData();
}
...
}

更多：安卓图片动画（http://www.open-open.com/lib/view/open1335777066015.html）、点九图工具：

1.打开Android 工程包 SDK文件，tools文件，双击draw9patch.bat

2.弹出的窗口点击 File，点击要编辑的图片open 9patch

3.编辑。鼠标左键：划线 / shift + 鼠标左键：删除划线

4.保存。点击save 9patch

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