android在处理一写图片资源的时候,会进行一些类型的转换,现在有空整理一下:
1、Drawable → Bitmap
Java代码
- public static Bitmap drawableToBitmap(Drawable drawable) {
-
- Bitmap bitmap = Bitmap
- .createBitmap(
- drawable.getIntrinsicWidth(),
- drawable.getIntrinsicHeight(),
- drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
- : Bitmap.Config.RGB_565);
- Canvas canvas = new Canvas(bitmap);
-
- drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
- drawable.draw(canvas);
- return bitmap;
- }
- 2、从资源中获取Bitmap
- Java代码
-
- Resources res=getResources();
-
- Bitmap bmp=BitmapFactory.decodeResource(res, R.drawable.pic);
- 3、Bitmap → byte[]
- Java代码
-
- private byte[] Bitmap2Bytes(Bitmap bm){
- ByteArrayOutputStream baos = new ByteArrayOutputStream();
- bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
- return baos.toByteArray();
- }
-
- 4、 byte[] → Bitmap
-
- Java代码
-
- private Bitmap Bytes2Bimap(byte[] b){
- if(b.length!=0){
- return BitmapFactory.decodeByteArray(b, 0, b.length);
- }
- else {
- return null;
- }
- }
一些activity 样式:
•android:theme="@android:style/Theme.Dialog" 将一个Activity显示为对话框模式
•android:theme="@android:style/Theme.NoTitleBar" 不显示应用程序标题栏
•android:theme="@android:style/Theme.NoTitleBar.Fullscreen" 不显示应用程序标题栏,并全屏
•android:theme="@android:style/Theme.Light" 背景为白色
•android:theme="@android:style/Theme.Light.NoTitleBar" 白色背景并无标题栏
•android:theme="@android:style/Theme.Light.NoTitleBar.Fullscreen" 白色背景,无标题栏,全屏
•android:theme="@android:style/Theme.Black" 背景黑色
•android:theme="@android:style/Theme.Black.NoTitleBar" 黑色背景并无标题栏
•android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen" 黑色背景,无标题栏,全屏
•android:theme="@android:style/Theme.Wallpaper" 用系统桌面为应用程序背景
•android:theme="@android:style/Theme.Wallpaper.NoTitleBar" 用系统桌面为应用程序背景,且无标题栏
•android:theme="@android:style/Theme.Wallpaper.NoTitleBar.Fullscreen" 用系统桌面为应用程序背景,无标题栏,全屏
•android:theme="@android:style/Translucent" 半透明效果
•android:theme="@android:style/Theme.Translucent.NoTitleBar" 半透明并无标题栏
•android:theme="@android:style/Theme.Translucent.NoTitleBar.Fullscreen" 半透明效果,无标题栏,全屏
•android:theme="@android:style/Theme.Panel"
•android:theme="@android:style/Theme.Light.Panel"
转自:http://makeyouown.iteye.com/blog/1273319