android 自定义组合控件 顶部导航栏

时间:2022-03-29 20:48:38

在软件开发过程中,经常见到,就是APP 的标题栏样式几乎都是一样的,只是文字不同而已,两边图标不同。为了减少重复代码,提高效率, 方便大家使用,我们把标题栏通过组合的方式定义成一个控件。

例下图:

android 自定义组合控件 顶部导航栏

点击:

android 自定义组合控件 顶部导航栏

如不设置左边,右边图片:

android 自定义组合控件 顶部导航栏

下面说一下具体实现步骤:



步骤一:



导航栏包括:

* 返回按钮

* 标题

* 右侧按钮(功能不确定)



首先是布局文件,如下:

</pre><p></p><pre name="code" class="java"><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="wrap_content"
android:background="@android:color/holo_blue_light"
tools:context=".MainActivity" > <TextView
android:id="@+id/text_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:textSize="25sp"
android:gravity="center"
android:textColor="@android:color/white"
android:padding="2dp"
/> <ImageView
android:id="@+id/back_image"
android:layout_width="40dp"
android:layout_height="40dp"
android:scaleType="centerInside"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_marginLeft="12dp"
/> <ImageView
android:id="@+id/right_image"
android:layout_width="40dp"
android:layout_height="40dp"
android:scaleType="centerInside"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="12dp"
/> </RelativeLayout>

步骤二:在values下新建 attrs文件 定义控件要用到的属性,如下面的代码所示。这里我们定义了标题栏文字(textText),字体大小(textSize),字体颜色(textColor),左边按钮 (leftBtn ),右边按钮 (rightBtn )  。(当然你还要以给它添加其它属性如背景)

<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="Topbar">
<attr name="titleText" format="string|reference" />
<attr name="titleSize" format="dimension|reference" />
<attr name="titleColor" format="color|reference" /> <attr name="leftBtn" format="reference"/>
<attr name="rightBtn" format=" reference"/> </declare-styleable>
</resources>

步骤三:定义类Topbar继承自RelativeLayout,重写构造函数并构造方法中获得我们自定义的属性,具体代码如下。代码中定义了一个TextView显示标题文字,一个Imageview 显示左侧按钮,一个Imageview 显示右侧按钮 ,其他字段对应attrs中声明的属性。

	private ImageView backView;
private ImageView rightView;
private TextView titleView; private String titleTextStr;
private int titleTextSize ;
private int titleTextColor ; private Drawable leftImage ;
private Drawable rightImage ; public TopBarView(Context context){
this(context, null);
} public TopBarView(Context context, AttributeSet attrs) {
this(context, attrs,R.style.AppTheme); } public TopBarView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
getConfig(context, attrs);
initView(context);
} /**
* 从xml中获取配置信息
*/
private void getConfig(Context context, AttributeSet attrs) {
//TypedArray是一个数组容器用于存放属性值
TypedArray ta = context.obtainStyledAttributes(attrs,R.styleable.Topbar); int count = ta.getIndexCount();
for(int i = 0;i<count;i++)
{
int attr = ta.getIndex(i);
switch (attr)
{
case R.styleable.Topbar_titleText:
titleTextStr = ta.getString(R.styleable.Topbar_titleText);
break;
case R.styleable.Topbar_titleColor:
// 默认颜色设置为黑色
titleTextColor = ta.getColor(attr, Color.BLACK);
break;
case R.styleable.Topbar_titleSize:
// 默认设置为16sp,TypeValue也可以把sp转化为px
titleTextSize = ta.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics()));
break; case R.styleable.Topbar_leftBtn: leftImage = ta.getDrawable(R.styleable.Topbar_leftBtn);
break;
case R.styleable.Topbar_rightBtn:
rightImage = ta.getDrawable(R.styleable.Topbar_rightBtn);
break;
}
} //用完务必回收容器
ta.recycle(); } private void initView(Context context)
{
View layout = LayoutInflater.from(context).inflate(R.layout.custom_groupwidget,
this,true); backView = (ImageView) layout.findViewById(R.id.back_image);
titleView = (TextView) layout.findViewById(R.id.text_title);
rightView = (ImageView) layout.findViewById(R.id.right_image);
backView.setOnClickListener(this);
rightView.setOnClickListener(this); if(null != leftImage)
backView.setImageDrawable(leftImage);
if(null != rightImage)
rightView.setImageDrawable(rightImage);
if(null != titleTextStr)
{
titleView.setText(titleTextStr);
titleView.setTextSize(titleTextSize);
titleView.setTextColor(titleTextColor);
}
}

步骤四:定义了一个OnClickListenner来监听ImageView的点击

   private onTitleBarClickListener onMyClickListener;

    /**
* 设置按钮点击监听接口
* @param callback
*/
public void setClickListener(onTitleBarClickListener listener) {
this.onMyClickListener = listener;
} /**
* 导航栏点击监听接口
*/
public static interface onTitleBarClickListener{
/**
* 点击返回按钮回调
*/
void onBackClick(); void onRightClick();
} @Override
public void onClick(View v) {
int id = v.getId();
switch(id)
{
case R.id.back_image:
if(null != onMyClickListener)
onMyClickListener.onBackClick();
break;
case R.id.right_image:
if(null != onMyClickListener)
onMyClickListener.onRightClick();
break;
}
}

步骤五:
再看一下主布局怎样使用自定义控件:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:custom="http://schemas.android.com/apk/res/com.example.customgroupwidget"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" > <com.example.customgroupwidget.TopBarView
android:id="@+id/topbar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
custom:titleText="我的消息"
custom:titleSize="15sp"
custom:titleColor="@android:color/white"
custom:leftBtn="@drawable/back_page"
custom:rightBtn="@drawable/edit_normal" /> </RelativeLayout>

步骤六:最后看一下Activity中的调用:

public class MainActivity extends Activity implements onTitleBarClickListener {

    private  TopBarView topbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); topbar = (TopBarView)findViewById(R.id.topbar); topbar.setClickListener(this);
}
@Override
public void onBackClick() {
Toast.makeText(MainActivity.this, "你点击了左侧按钮", Toast.LENGTH_LONG).show(); }
@Override
public void onRightClick() {
Toast.makeText(MainActivity.this, "你点击了右侧按钮", Toast.LENGTH_SHORT).show(); }
}

 demo下载

最后普及一下,attrs.xml中的属性的format(类型)说明

1. reference:参考某一资源ID。

(1)属性定义:

<declare-styleable name = "名称">

<attr name = "background" format = "reference" />

</declare-styleable>

(2)属性使用:

<ImageView

android:layout_width = "42dip"

                     android:layout_height = "42dip"

                     android:background = "@drawable/图片ID"

/>

2. color:颜色值。

(1)属性定义:

<declare-styleable name = "名称">

<attr name = "textColor" format = "color" />

</declare-styleable>

(2)属性使用:

<TextView

android:layout_width = "42dip"

                     android:layout_height = "42dip"

                     android:textColor = "#00FF00"

/>

3. boolean:布尔值。

(1)属性定义:

<declare-styleable name = "名称">

<attr name = "focusable" format = "boolean" />

</declare-styleable>

(2)属性使用:

<Button

android:layout_width = "42dip"

                    android:layout_height = "42dip"

android:focusable = "true"

/>

4. dimension:尺寸值。

(1)属性定义:

<declare-styleable name = "名称">

<attr name = "layout_width" format = "dimension" />

</declare-styleable>

(2)属性使用:

<Button

android:layout_width = "42dip"

                    android:layout_height = "42dip"

/>

5. float:浮点值。

(1)属性定义:

<declare-styleable name = "AlphaAnimation">

<attr name = "fromAlpha" format = "float" />

                   <attr name = "toAlpha" format = "float" />

</declare-styleable>

(2)属性使用:

<alpha

                   android:fromAlpha = "1.0"

                   android:toAlpha = "0.7"

/>

6. integer:整型值。

(1)属性定义:

<declare-styleable name = "AnimatedRotateDrawable">

<attr name = "visible" />

                   <attr name = "frameDuration" format="integer" />

                   <attr name = "framesCount" format="integer" />

                   <attr name = "pivotX" />

                   <attr name = "pivotY" />

                   <attr name = "drawable" />

</declare-styleable>

(2)属性使用:

<animated-rotate

xmlns:android = "http://schemas.android.com/apk/res/android

                   android:drawable = "@drawable/图片ID" 

                   android:pivotX = "50%" 

                   android:pivotY = "50%" 

                   android:framesCount = "12" 

                   android:frameDuration = "100"

/>

7. string:字符串。

(1)属性定义:

<declare-styleable name = "MapView">

                   <attr name = "apiKey" format = "string" />

            </declare-styleable>

(2)属性使用:

<com.google.android.maps.MapView

                    android:layout_width = "fill_parent"

                    android:layout_height = "fill_parent"

                    android:apiKey = "0jOkQ80oD1JL9C6HAja99uGXCRiS2CGjKO_bc_g"

/>

8. fraction:百分数。

(1)属性定义:

<declare-styleable name="RotateDrawable">

                   <attr name = "visible" />

                   <attr name = "fromDegrees" format = "float" />

                   <attr name = "toDegrees" format = "float" />

                   <attr name = "pivotX" format = "fraction" />

                   <attr name = "pivotY" format = "fraction" />

                   <attr name = "drawable" />

            </declare-styleable>

(2)属性使用:

<rotate

xmlns:android = "http://schemas.android.com/apk/res/android"

               android:interpolator = "@anim/动画ID"

android:fromDegrees = "0"

               android:toDegrees = "360"

android:pivotX = "200%"

android:pivotY = "300%"

               android:duration = "5000"

android:repeatMode = "restart"

android:repeatCount = "infinite"

/>

9. enum:枚举值。

(1)属性定义:

<declare-styleable name="名称">

                   <attr name="orientation">

                          <enum name="horizontal" value="0" />

                          <enum name="vertical" value="1" />

                   </attr>

</declare-styleable>

(2)属性使用:

<LinearLayout

xmlns:android = "http://schemas.android.com/apk/res/android"

                    android:orientation = "vertical"

                    android:layout_width = "fill_parent"

                    android:layout_height = "fill_parent"

                    >

            </LinearLayout>

10. flag:位或运算。

(1)属性定义:

<declare-styleable name="名称">

                    <attr name="windowSoftInputMode">

                            <flag name = "stateUnspecified" value = "0" />

                            <flag name = "stateUnchanged" value = "1" />

                            <flag name = "stateHidden" value = "2" />

                            <flag name = "stateAlwaysHidden" value = "3" />

                            <flag name = "stateVisible" value = "4" />

                            <flag name = "stateAlwaysVisible" value = "5" />

                            <flag name = "adjustUnspecified" value = "0x00" />

                            <flag name = "adjustResize" value = "0x10" />

                            <flag name = "adjustPan" value = "0x20" />

                            <flag name = "adjustNothing" value = "0x30" />

                     </attr>

</declare-styleable>

(2)属性使用:

<activity

android:name = ".StyleAndThemeActivity"

                   android:label = "@string/app_name"

                   android:windowSoftInputMode = "stateUnspecified | stateUnchanged | stateHidden">

                   <intent-filter>

                          <action android:name = "android.intent.action.MAIN" />

                          <category android:name = "android.intent.category.LAUNCHER" />

                   </intent-filter>

             </activity>

特别要注意:

属性定义时可以指定多种类型值。

(1)属性定义:

<declare-styleable name = "名称">

<attr name = "background" format = "reference|color" />

</declare-styleable>

(2)属性使用:

<ImageView

android:layout_width = "42dip"

                     android:layout_height = "42dip"

                     android:background = "@drawable/图片ID|#00FF00"

/>