自定义顶部TitleBar控件
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其实这个控件还是相对简单的，只需要自定义一些属性，然后继承RelativeLayout根据应用的需求对左中右的空间进行添加控件和监听事件的添加即可，多的不说，先上代码
<!--自定义标题栏--><declare-styleable name="Title_bar"> <attr name="titleText" format="string|reference"/> <attr name="titleTextSize" format="dimension|reference"/> <attr name="titleColor" format="color|reference"/> <attr name="leftBtnText" format="string|reference"/> <attr name="leftBtnTextSize" format="dimension|reference"/> <attr name="leftBtnImage" format="reference"/> <attr name="leftTextColor" format="color|reference"/> <attr name="left_padding_left" format="dimension|reference"/> <attr name="left_padding_right" format="dimension|reference"/> <attr name="left_drawable_padding" format="dimension|reference"/> <attr name="rightBtnText" format="string|reference"/> <attr name="rightBtnTextSize" format="dimension|reference"/> <attr name="rightTExtColor" format="color|reference"/> <attr name="rightBtnImage" format="reference"/> <attr name="right_padding_left" format="dimension|reference"/> <attr name="right_padding_right" format="dimension|reference"/></declare-styleable>可以很明显得看出各自所定义的属性，应为中间的位置一般是不需要添加图片的，所以只有文字的属性，而左右位置有可能是文字和图片都存在的形式展示，所以需要多一些属性来定义左右位置的空间的展示。接下来是自定义的RelativeLayout的Java文件，也比较简单，无非就是对位置与间距、字号的定义。
package tv.buka.view;import android.content.Context;import android.content.res.TypedArray;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.util.TypedValue;import android.view.Gravity;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.RelativeLayout;import android.widget.TextView;import tv.buka.R;/** * Created by zhangjutao on 16/9/18. */public class TitleBarView extends RelativeLayout { /** * 中间标题 */ private String title; /** * 左边文字标题 */ private String leftTitle; /** * 右边标题文字 */ private String rightTitle; /** * 标题文字尺寸 */ private float titleTextSize; /** * 左边文字尺寸 */ private float leftTextSize; /** * 右边文字尺寸 */ private float rightTextSize; /** * 标题文字颜色 */ private int titleTextColor; /** * 左边标题文字颜色 */ private int leftTextColor; /** * 右边标题文字颜色 */ private int rightTextColor; /** * 左边按钮图片 */ private Drawable leftBtnImg; /** * 右边按钮图片 */ private Drawable rightBtnImage; private int leftPaddingLeft; private int leftPaddingRight; private int leftDrawablePadding; private int rightPaddingLeft; private int rightPaddingRight; private OnLeftClick onLeftClick; private OnRightClick onRightClick; private OnCenterClick onCenterClick; public TitleBarView(Context context) { super(context,null); } public TitleBarView(Context context, AttributeSet attrs) { super(context, attrs); init(context,attrs); initView(context); } private void init(Context context, AttributeSet attrs) { TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.Title_bar); title = typedArray.getString(R.styleable.Title_bar_titleText); leftTitle = typedArray.getString(R.styleable.Title_bar_leftBtnText); rightTitle = typedArray.getString(R.styleable.Title_bar_rightBtnText); titleTextSize = typedArray.getDimension(R.styleable.Title_bar_titleTextSize,TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics())); leftTextSize = typedArray.getDimension(R.styleable.Title_bar_leftBtnTextSize,28f); rightTextSize = typedArray.getDimension(R.styleable.Title_bar_rightBtnTextSize,28f); titleTextColor = typedArray.getColor(R.styleable.Title_bar_titleColor,0); leftTextColor = typedArray.getColor(R.styleable.Title_bar_leftTextColor,0); rightTextColor = typedArray.getColor(R.styleable.Title_bar_rightTExtColor,0); leftBtnImg = typedArray.getDrawable(R.styleable.Title_bar_leftBtnImage); rightBtnImage = typedArray.getDrawable(R.styleable.Title_bar_rightBtnImage); leftPaddingLeft = typedArray.getDimensionPixelOffset(R.styleable.Title_bar_left_padding_left,0); leftPaddingRight = typedArray.getDimensionPixelOffset(R.styleable.Title_bar_left_padding_right,0); leftDrawablePadding = typedArray.getDimensionPixelOffset(R.styleable.Title_bar_left_drawable_padding,0); rightPaddingLeft = typedArray.getDimensionPixelOffset(R.styleable.Title_bar_right_padding_left,0); rightPaddingRight = typedArray.getDimensionPixelOffset(R.styleable.Title_bar_right_padding_right,0); typedArray.recycle(); } private void initView(Context context){ if (title!=null){ final TextView titleTv = new TextView(context); LayoutParams titleParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); titleParams.addRule(RelativeLayout.CENTER_IN_PARENT); titleTv.setGravity(Gravity.CENTER); titleTv.setText(title); titleTv.setTextColor(titleTextColor); titleTv.setTextSize(TypedValue.COMPLEX_UNIT_PX,titleTextSize); titleTv.setLayoutParams(titleParams); addView(titleTv); titleTv.setClickable(true); titleTv.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { if (onCenterClick!=null){ onCenterClick.onClick(titleTv); } } }); } if (leftTitle!=null&&leftBtnImg!=null){ final TextView leftTv = new TextView(context); LayoutParams leftParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.MATCH_PARENT); leftParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT); leftTv.setText(leftTitle); leftTv.setTextSize(TypedValue.COMPLEX_UNIT_PX,leftTextSize); leftTv.setTextColor(leftTextColor); leftTv.setGravity(Gravity.CENTER); leftTv.setPadding(leftPaddingLeft,0,leftPaddingRight,0); leftBtnImg.setBounds(0,0,leftBtnImg.getMinimumWidth(),leftBtnImg.getMinimumHeight()); leftTv.setCompoundDrawables(leftBtnImg,null,null,null); leftTv.setCompoundDrawablePadding(leftDrawablePadding); leftTv.setLayoutParams(leftParams); addView(leftTv); leftTv.setClickable(true); leftTv.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { if (onLeftClick!=null){ onLeftClick.onClick(leftTv); } } }); }else if (leftTitle==null&&leftBtnImg!=null){ final ImageView leftImg = new ImageView(context); LayoutParams leftParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.MATCH_PARENT); leftParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT); leftImg.setScaleType(ImageView.ScaleType.CENTER); leftImg.setPadding(leftPaddingLeft,0,leftPaddingRight,0); leftImg.setLayoutParams(leftParams); addView(leftImg); leftImg.setClickable(true); leftImg.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { if (onLeftClick!=null){ onLeftClick.onClick(leftImg); } } }); }else if (leftTitle!=null&&leftBtnImg==null){ final TextView leftTv = new TextView(context); LayoutParams leftParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.MATCH_PARENT); leftParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT); leftTv.setGravity(Gravity.CENTER); leftTv.setPadding(leftPaddingLeft,0,leftPaddingRight,0); leftTv.setText(leftTitle); leftTv.setTextSize(TypedValue.COMPLEX_UNIT_PX,leftTextSize); leftTv.setTextColor(leftTextColor); leftTv.setLayoutParams(leftParams); addView(leftTv); leftTv.setClickable(true); leftTv.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { if (onLeftClick!=null){ onLeftClick.onClick(leftTv); } } }); } if (rightTitle!=null){ final TextView rightTv = new TextView(context); LayoutParams rightParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.MATCH_PARENT); rightParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT); rightTv.setText(rightTitle); rightTv.setTextSize(TypedValue.COMPLEX_UNIT_PX,rightTextSize); rightTv.setTextColor(rightTextColor); rightTv.setGravity(Gravity.CENTER); rightTv.setPadding(rightPaddingLeft,0,rightPaddingRight,0); rightTv.setLayoutParams(rightParams); addView(rightTv); rightTv.setClickable(true); rightTv.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { if (onRightClick!=null){ onRightClick.onClick(rightTv); } } }); }else if (rightBtnImage!=null){ final ImageView rightImg = new ImageView(context); LayoutParams rightParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.MATCH_PARENT); rightParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT); rightImg.setImageDrawable(rightBtnImage); rightImg.setScaleType(ImageView.ScaleType.CENTER); rightImg.setPadding(rightPaddingLeft,0,rightPaddingRight,0); rightImg.setLayoutParams(rightParams); addView(rightImg); rightImg.setClickable(true); rightImg.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { if (onRightClick!=null){ onRightClick.onClick(rightImg); } } }); } } public void setTitle(String title) { this.title = title; } public void setLeftTitle(String leftTitle) { this.leftTitle = leftTitle; } public void setRightTitle(String rightTitle) { this.rightTitle = rightTitle; } public void setTitleTextSize(float titleTextSize) { this.titleTextSize = titleTextSize; } public void setLeftTextSize(float leftTextSize) { this.leftTextSize = leftTextSize; } public void setRightTextSize(float rightTextSize) { this.rightTextSize = rightTextSize; } public void setTitleTextColor(int titleTextColor) { this.titleTextColor = titleTextColor; } public void setLeftTextColor(int leftTextColor) { this.leftTextColor = leftTextColor; } public void setRightTextColor(int rightTextColor) { this.rightTextColor = rightTextColor; } public void setLeftBtnImg(Drawable leftBtnImg) { this.leftBtnImg = leftBtnImg; } public void setRightBtnImage(Drawable rightBtnImage) { this.rightBtnImage = rightBtnImage; } public void setLeftPaddingLeft(int leftPaddingLeft) { this.leftPaddingLeft = leftPaddingLeft; } public void setLeftPaddingRight(int leftPaddingRight) { this.leftPaddingRight = leftPaddingRight; } public void setLeftDrawablePadding(int leftDrawablePadding) { this.leftDrawablePadding = leftDrawablePadding; } public void setRightPaddingLeft(int rightPaddingLeft) { this.rightPaddingLeft = rightPaddingLeft; } public void setRightPaddingRight(int rightPaddingRight) { this.rightPaddingRight = rightPaddingRight; } public void setOnLeftClick(OnLeftClick onLeftClick) { this.onLeftClick = onLeftClick; } public void setOnRightClick(OnRightClick onRightClick) { this.onRightClick = onRightClick; } public void setOnCenterClick(OnCenterClick onCenterClick) { this.onCenterClick = onCenterClick; } /** * 左边控件的监听 */ public interface OnLeftClick{ void onClick(View view); } /** * 右边控件的监听 */ public interface OnRightClick{ void onClick(View view); } /** * 中间控件的监听 */ public interface OnCenterClick{ void onClick(View view); }}特别要注意的是字号的设置，也就是TextView.setTextSize的设置，直接设置你在xml文件中定义的字号的话是偏大的，为什么呢，不管你在xml文件中定义的是什么单位，px或者是sp，当返回到Java文件中时getDmesion都是返回的px，如果你设置的是sp值，方法会自动给你乘以你手机对应的分辨率比例，而setTextSize自动设置的是sp指，也就是说还会给你再乘一遍，这样造成的后果就是你设置的文字字号都整体偏大，所以这里，你需要在设置setSize的时候给他规定一下单位
TextView.setTextSize(TypedValue.COMPLEX_UNIT_PX,rightTextSize);这样你设置的字号就正确了，然后ok你的空间就可以用了
<TitleBarView android:id="@+id/select_top_layout" android:layout_width="match_parent" android:layout_height="44dp" android:background="@color/main_color" android:visibility="gone" app:titleText = "@string/all_selected" app:titleTextSize="18sp" app:titleColor="@color/white" app:leftBtnText="@string/cancel" app:leftBtnTextSize="18sp" app:leftTextColor="@color/white" app:left_padding_left="15dp" app:rightBtnImage="@mipmap/icon_delete" app:right_padding_right="15dp"/>配上效果图：
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