android中点击home键退出和点击back键退出有什么不同

android中点击home键退出和点击back键退出有什么不同

点击home键不会把activity从栈中弹出，back键会弹出栈顶的activity

* android常用的物理按键及其触发事件 * keycode_power 电源键 * keycode_menu 菜单键 * keycode_back 后退键 * keycode_home home键 * keycode_camera 相机键 * keycode_search 查找键 * keycode_volume_up 音量键+ * keycode_volume_down 音量键- * keycode_volume_mute 静音 * 方向键 * keycode_dpad_center * keycode_dpad_up * keycode_dpad_down * keycode_dpad_left * keycode_dpad_right * 键盘键 * 数字0~9 字母a~z * keycode_0 ~ keycode_9 * keycode_a ~ keycode_z * 提供的回调方法有 * onkeyup()、onkeydown()、onkeylongpress() * * @author administrator * */ public class mainactivity extends activity { private button btnclose = null; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.main); btnclose = (button) findviewbyid(r.id.btnclose); btnclose.setonclicklistener(new closelistener()); } class closelistener implements onclicklistener { @override public void onclick(view v) { // todo auto-generated method stub finish(); } } @override public boolean onkeydown(int keycode, keyevent event) { // todo auto-generated method stub if (keycode == keyevent.keycode_back) { toast.maketext(this, "后退键", toast.length_short).show(); return true; } else if (keycode == keyevent.keycode_volume_up) { toast.maketext(this, "声音+", toast.length_short).show(); return false; } else if (keycode == keyevent.keycode_volume_down) { toast.maketext(this, "声音-", toast.length_short).show(); return false; } else if (keycode == keyevent.keycode_volume_mute) { toast.maketext(this, "静音", toast.length_short).show(); return false; } else if (keycode == keyevent.keycode_home) { toast.maketext(this, "home", toast.length_short).show(); return true; } return super.onkeydown(keycode, event); } @override public boolean ontouchevent(motionevent event) { // todo auto-generated method stub if (event.getaction() == motionevent.action_move) { toast.maketext(this, "action_move", toast.length_short).show(); } else if (event.getaction() == motionevent.action_up) { toast.maketext(this, "action_move", toast.length_short).show(); } else if (event.getaction() == motionevent.action_down) { toast.maketext(this, "action_move", toast.length_short).show(); } return super.ontouchevent(event); } } 更多的事件可以参考sdk文档的motionevent、keyevent两个类，在keyevent中如果处理了keyevent.keycode_back事件，那就不会执行默认的操作，比如收到keyevent.keycode_back事件后默认是退出，如果直接return那就不会处理退出了。

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