关于程序响应 HOME 及 BACK 按键

public boolean onKeyDown(int keyCode, KeyEvent event) {

switch (keyCode) {

case KeyEvent.KEYCODE_0:

.......

return true;

case KeyEvent.KEYCODE_A:

.......

return true;
case KeyEvent.KEYCODE_HOME:
case KeyEvent.KEYCODE_BACK:
super.onKeyDown(int keyCode, KeyEvent event);
return true;

// break; //  加这句编译器将报错，符合C/C++语法，但不符合java语法
}
return false;
}

public boolean onKeyDown(int keyCode, KeyEvent event) {

if (keyCode == KeyEvent.KEYCODE_HOME) {
// When the user center presses, let them pick a contact.
startActivity(
new Intent(Intent.ACTION_MAIN, null));
return true;
}
return false;
}