效果图:
现在市场上大多数软件都是类似于上面的结构，底部有几个按钮用于切换到不同的界面。基于OOP思想，我想把下面的一整块布局封装成一个类，也就是我们的自定义组合控件—底部多按钮切换布局，我把它叫做BottomLayout
看上面的布局，几个按钮横向排列，我们先看一下布局
最外面LinearLayout 方向 horizontal,然后5个weight相同的RelativeLayout,每个RelativeLayout里面有一个Button(用了显示选中状态)个ImageView(用来显示红点)
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="50dp"
android:orientation="horizontal" >
<RelativeLayout
android:id="@+id/rl_home"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:clickable="true" >
<ImageView
android:id="@+id/iv_new_home"
android:layout_width="10dp"
android:layout_height="10dp"
android:layout_alignParentRight="true"
android:layout_margin="3dp"
android:src="@drawable/read_circle" />
<Button
android:id="@+id/btn_home"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_centerInParent="true"
android:background="@drawable/tab_home_selector"
android:clickable="false" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/rl_encounter"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:clickable="true" >
<Button
android:id="@+id/btn_encounter"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_centerInParent="true"
android:background="@drawable/tab_enconter_selector"
android:clickable="false" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/rl_community"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:clickable="true" >
<ImageView
android:id="@+id/iv_new_community"
android:layout_width="10dp"
android:layout_height="10dp"
android:layout_alignParentRight="true"
android:layout_margin="3dp"
android:src="@drawable/read_circle" />
<Button
android:id="@+id/btn_community"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_centerInParent="true"
android:background="@drawable/tab_community_selector"
android:clickable="false" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/rl_message"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:clickable="true" >
<ImageView
android:id="@+id/iv_new_message"
android:layout_width="10dp"
android:layout_height="10dp"
android:layout_alignParentRight="true"
android:layout_margin="3dp"
android:src="@drawable/read_circle" />
<Button
android:id="@+id/btn_message"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_centerInParent="true"
android:background="@drawable/tab_message_selector"
android:clickable="false" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/rl_user"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:clickable="true" >
<Button
android:id="@+id/btn_user"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_centerInParent="true"
android:background="@drawable/tab_user_selector"
android:clickable="false" />
</RelativeLayout>
</LinearLayout>下面就是代码了
package comzyh.bottomlayout;
import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
/**
* 主界面底部的按钮切换布局
*
* @version 1.0
* @author zyh
*/
public class BottomLayout extends LinearLayout implements OnClickListener {
public BottomLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context);
}
public BottomLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public BottomLayout(Context context) {
this(context, null, 0);
}
private Context context;
private View rl_home, rl_encounter, rl_community, rl_message, rl_user;
private View iv_new_message, iv_new_home;
private Button btn_home, btn_encounter, btn_community, btn_message, btn_user;
private OnItemClickListener listener;
private int currentPosition = 0;
/**
* 初始化
*
* @version 1.0
* @author zyh
* @param context
*/
private void init(Context context) {
this.context = context;
LayoutInflater.from(context).inflate(R.layout.layout_bottom, this);
// 5块等分的布局
rl_home = findViewById(R.id.rl_home);
rl_encounter = findViewById(R.id.rl_encounter);
rl_community = findViewById(R.id.rl_community);
rl_message = findViewById(R.id.rl_message);
rl_user = findViewById(R.id.rl_user);
// 5个按钮
btn_home = (Button) findViewById(R.id.btn_home);
btn_encounter = (Button) findViewById(R.id.btn_encounter);
btn_community = (Button) findViewById(R.id.btn_community);
btn_message = (Button) findViewById(R.id.btn_message);
btn_user = (Button) findViewById(R.id.btn_user);
// 小圆点
iv_new_home = findViewById(R.id.iv_new_home);
iv_new_message = findViewById(R.id.iv_new_message);
hideHomeCircle();
hideMessageCircle();
changeButtonStatus(0);// 默认是位置0
setListener();
}
/**
* 显示首页按钮旁边的小红圈
*
* @version 1.0
* @author zyh
*/
public void showHomeCircle() {
iv_new_home.setVisibility(View.VISIBLE);
}
/**
* 隐藏首页按钮旁边的小红圈
*
* @version 1.0
* @author zyh
*/
public void hideHomeCircle() {
iv_new_home.setVisibility(View.GONE);
}
/**
* 显示首页按钮旁边的小红圈
*
* @version 1.0
* @author zyh
*/
public void showMessageCircle() {
iv_new_message.setVisibility(View.VISIBLE);
}
/**
* 隐藏首页按钮旁边的小红圈
*
* @version 1.0
* @author zyh
*/
public void hideMessageCircle() {
iv_new_message.setVisibility(View.GONE);
}
/**
* 为按钮设计按下监听
*
* @version 1.0
* @author zyh
*/
private void setListener() {
rl_home.setOnClickListener(this);
rl_encounter.setOnClickListener(this);
rl_community.setOnClickListener(this);
rl_message.setOnClickListener(this);
rl_user.setOnClickListener(this);
}
/**
* 提供给外部设置点击Item的接口
*
* @version 1.0
* @author zyh
* @param listener
*/
public void setOnItemClickListener(OnItemClickListener listener) {
this.listener = listener;
}
public interface OnItemClickListener {
public void onItemClick(int position);
}
@Override
public void onClick(View v) {
currentPosition = 0;
switch (v.getId()) {
case R.id.rl_home:
currentPosition = 0;
break;
case R.id.rl_encounter:
currentPosition = 1;
break;
case R.id.rl_community:
currentPosition = 2;
break;
case R.id.rl_message:
currentPosition = 3;
break;
case R.id.rl_user:
currentPosition = 4;
break;
}
if (listener == null) {
return;
}
listener.onItemClick(currentPosition);
changeButtonStatus(currentPosition);
}
/**
* 根据当前位置改变按钮选中状态
*
* @version 1.0
* @author zyh
* @param position
*/
private void changeButtonStatus(int position) {
btn_home.setSelected(position == 0);
btn_encounter.setSelected(position == 1);
btn_community.setSelected(position == 2);
btn_message.setSelected(position == 3);
btn_user.setSelected(position == 4);
}
}
上面的布局可以进行一点优化
查看布局层次,发现中间多了一层LinearLayout,为什么呢?
因为我们的BottomLayout本身继承自LinearLayout,而且我们在代码中这样写的
LayoutInflater.from(context).inflate(R.layout.layout_bottom, this);又添加了一层布局,怎么优化呢?
使用merge节点来消除冗余节点
所以布局文件我们可以写成下面
<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
android:gravity="center"
android:orientation="horizontal" >
<RelativeLayout
android:id="@+id/rl_home"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:clickable="true" >
<ImageView
android:id="@+id/iv_new_home"
android:layout_width="10dp"
android:layout_height="10dp"
android:layout_alignParentRight="true"
android:layout_margin="3dp"
android:src="@drawable/read_circle" />
<Button
android:id="@+id/btn_home"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_centerInParent="true"
android:background="@drawable/tab_home_selector"
android:clickable="false" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/rl_encounter"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:clickable="true" >
<Button
android:id="@+id/btn_encounter"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_centerInParent="true"
android:background="@drawable/tab_enconter_selector"
android:clickable="false" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/rl_community"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:clickable="true" >
<Button
android:id="@+id/btn_community"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_centerInParent="true"
android:background="@drawable/tab_community_selector"
android:clickable="false" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/rl_message"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:clickable="true" >
<ImageView
android:id="@+id/iv_new_message"
android:layout_width="10dp"
android:layout_height="10dp"
android:layout_alignParentRight="true"
android:layout_margin="3dp"
android:src="@drawable/read_circle" />
<Button
android:id="@+id/btn_message"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_centerInParent="true"
android:background="@drawable/tab_message_selector"
android:clickable="false" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/rl_user"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:clickable="true" >
<Button
android:id="@+id/btn_user"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_centerInParent="true"
android:background="@drawable/tab_user_selector"
android:clickable="false" />
</RelativeLayout>
</merge>
关于merge可以看我的这篇Android 视图优化merge标签分析
下面在主界面中
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<comzyh.bottomlayout.BottomLayout
android:id="@+id/layout_bottom"
android:layout_width="match_parent"
android:layout_height="56dp"
android:layout_alignParentBottom="true"
android:background="@android:color/darker_gray" />
</RelativeLayout>使用自定义组合控件
public class MainActivity extends Activity {
private BottomLayout layout_bottom;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
layout_bottom = (BottomLayout) findViewById(R.id.layout_bottom);
layout_bottom.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(int position) {
Toast.makeText(MainActivity.this, "点击了" + position, 0).show();
}
});
new Handler().postDelayed(new Runnable() {
public void run() {
layout_bottom.showHomeCircle();
}
}, 5000);
new Handler().postDelayed(new Runnable() {
public void run() {
layout_bottom.showMessageCircle();
}
}, 8000);
}
}原文地址：http://blog.csdn.net/hpu_zyh/article/details/43713187
