android back键处理

public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
if (!mRechargeFragment.onBackPressed()) {
return super.onKeyDown(keyCode, event);
} else {
return false;
}
} else {
return super.onKeyDown(keyCode, event);
}
}

public boolean onBackPressed() {
//加入你想要的逻辑，并返回适当的值 true消费该事件，false继续传递
if (mLoginPopupWindow.isShowing()) {
mLoginPopupWindow.dismiss();
return true;
} else {
return false;
}
}