问题
I developed a application for Android 3.0, and it's runs perfectly well, but the client insist on compatibility with 2.2 devices.
Disabling hardware acceleration, using Android Compatibility Package, a NIO-backport support (For tasks and executors) and some reimplementation of View methods I was able to port my app for Android 2.2 and works really good, but if I run this apk into a newer device the performance is extremely slowly, so I want to know how to turn on hardware acceleration if available but still uses my 2.2 APK.
回答1:
Add android:hardwareAccelerated="true" to your manifest, either for the <activity> or the <application>.
This attribute will be ignored on older versions of Android, but will be honored on Android 3.0+.
This will require you to have set your build target to API Level 11 or higher, but you probably already have that.
回答2:
If you need support devises with old OS (2.3.X and older) version, not add android:hardwareAccelerated="true" to your manifest, try add this code in your java:
try { if( Build.VERSION.SDK_INT >= 11) getWindow().setFlags( 16777216, 16777216); } catch( Exception e) {} // FLAG_HARDWARE_ACCELERATED == 16777216 (0x01000000)
This is work in OS 3.0++ and not call error on 2.3.X and older.
回答3:
You can look here to see how you can enable features based on Android version. You can do it with reflection too, but it is clunky.
来源：https://stackoverflow.com/questions/10339277/turn-on-hardware-acceleration-if-available-such-android-3-with-android-apk-2