am 3c04cc44: Merge "Don\'t talk about Froyo as if it\'s still in the future."

usually inline the access, and if you need to restrict or debug field access

usually inline the access, and if you need to restrict or debug field access

you can add the code at any time.</p>

you can add the code at any time.</p>

<p>On Android, this is a bad idea.  Virtual method calls are expensive,

<p>On Android, this can be a bad idea.  Virtual method calls can be more

much more so than instance field lookups.  It's reasonable to follow

expensive than instance field lookups.  It's reasonable to follow

common object-oriented programming practices and have getters and setters

common object-oriented programming practices and have getters and setters

in the public interface, but within a class you should always access

in the public interface, but within a class you might want to access

fields directly.</p>

fields directly.</p>

<p>Without a JIT, direct field access is about 3x faster than invoking a

<p>Without a JIT, direct field access is about 3x faster than invoking a

trivial getter. With the JIT (where direct field access is as cheap as

trivial getter (one that simply returns the value of a field, without

accessing a local), direct field access is about 7x faster than invoking a

any dereferencing or array indexing). With the Froyo JIT, direct field

trivial getter. This is true in Froyo, but will improve in the future when

access was about 7x faster than invoking a trivial getter. Since

the JIT inlines getter methods.</p>

Gingerbread, though, the JIT inlines trivial getter methods, making

that particular optimization obsolete. Manual inlining guided by

profiling can still be a useful technique in general, though.</a>

<p>Note that if you're using ProGuard, you can have the best

<p>Note that if you're using ProGuard, you can have the best

of both worlds because ProGuard can inline accessors for you.</p>

of both worlds even with non-trival accessors, because ProGuard can inline

for you.</p>

<a name="use_final" id="use_final"></a>

<a name="use_final" id="use_final"></a>

<h2>Use Static Final For Constants</h2>

<h2>Use Static Final For Constants</h2>