禁用home 4.0+ ,亲测可用

在 oncreat( )方法假如代码    

this.getWindow().setFlags(FLAG_HOMEKEY_DISPATCHED, FLAG_HOMEKEY_DISPATCHED);

this.getWindow().setFlags(FLAG_HOMEKEY_DISPATCHED, FLAG_HOMEKEY_DISPATCHED);

定义变量  
public static final int FLAG_HOMEKEY_DISPATCHED = 0x80000000;