Android 自定义view实现TopBar效果

<?xml version="1.0" encoding="utf-8"?  
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  xmlns:tools="http://schemas.android.com/tools" 
  android:id="@+id/activity_main" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:paddingBottom="@dimen/activity_vertical_margin" 
  android:paddingLeft="@dimen/activity_horizontal_margin" 
  android:paddingRight="@dimen/activity_horizontal_margin" 
  android:paddingTop="@dimen/activity_vertical_margin" 
  tools:context="com.bwie.test.MainActivity"  
 
  <com.bwie.test.MyView 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:lt="http://schemas.android.com/apk/res-auto" 
    android:id="@+id/titlebar" 
    android:layout_width="match_parent" 
    android:layout_height="60dp" 
    lt:leftButtonText="返回" 
    lt:leftButtonTextColor="@android:color/white" 
    lt:leftButtonTextSize="8sp" 
    lt:buttonBgColor="#4556ec" 
    lt:titleText="标题" 
    lt:titleColor="@android:color/white" 
    lt:titleSize="8sp" 
    lt:rightButtonText="完成" 
    lt:rightButtonTextColor="@android:color/white" 
    lt:rightButtonTextSize="8sp" 
    android:background="#47ea10" 
    android:padding="10sp" 
      
  </com.bwie.test.MyView  
</RelativeLayout  

<?xml version="1.0" encoding="utf-8"?  
<resources  
  <declare-styleable name="Titlebar"  
    <attr name="leftButtonText" format="string|reference" </attr  
    <attr name="leftButtonTextColor" format="color|reference" </attr  
    <attr name="leftButtonTextSize" format="dimension|reference" </attr  
    <attr name="leftButtonImage" format="color|reference" </attr  
    <attr name="buttonBgColor" format="color"/  
 
    <attr name="titleText" format="string|reference" </attr  
    <attr name="titleColor" format="color|reference" </attr  
    <attr name="titleSize" format="dimension|reference" </attr  
 
    <attr name="rightButtonText" format="string|reference" </attr  
    <attr name="rightButtonTextColor" format="color|reference" </attr  
    <attr name="rightButtonTextSize" format="dimension|reference" </attr  
    <attr name="rightButtonImage" format="color|reference" </attr  
 
 
  </declare-styleable  
 
</resources  

public class MyView extends RelativeLayout{ 
private String mLeftButtonText; 
private int mLeftButtonTextColor; 
private float mLeftButtonSize; 
private Drawable mLeftButtonImage; 
private String mTitleButtonText; 
private int mTitleButtonTextColor; 
private float mTitleButtonSize; 
private String mRightButtonText; 
private int mRightButtonTextColor; 
private float mRightButtonSize; 
private Drawable mRightButtonImage; 
private TextView mRightTextView; 
private TextView titleTextView; 
private ImageView mLeftButton; 
private TextView mLeftTextView; 
private ImageView mRightButton; 
int buttonBgColor; 
public MyView(Context context) { 
this(context,null); 
} 
public MyView(Context context, AttributeSet attrs) { 
this(context, attrs,0); 
TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.Titlebar); 
buttonBgColor = typedArray.getColor(R.styleable.Titlebar_buttonBgColor,Color.BLUE); 
//左侧的按钮 
mLeftButtonText = typedArray.getString(R.styleable.Titlebar_leftButtonText); 
mLeftButtonTextColor = typedArray.getColor(R.styleable.Titlebar_leftButtonTextColor, Color.GRAY); 
mLeftButtonSize = typedArray.getDimension(R.styleable.Titlebar_leftButtonTextSize, TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics())); 
mLeftButtonImage = typedArray.getDrawable(R.styleable.Titlebar_leftButtonImage); 
//中间的按钮 
mTitleButtonText = typedArray.getString(R.styleable.Titlebar_titleText); 
mTitleButtonTextColor = typedArray.getColor(R.styleable.Titlebar_titleColor, Color.GRAY); 
mTitleButtonSize = typedArray.getDimension(R.styleable.Titlebar_titleSize, TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics())); 
//右侧的按钮 
mRightButtonText = typedArray.getString(R.styleable.Titlebar_rightButtonText); 
mRightButtonTextColor = typedArray.getColor(R.styleable.Titlebar_rightButtonTextColor, Color.GRAY); 
mRightButtonSize = typedArray.getDimension(R.styleable.Titlebar_rightButtonTextSize, TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics())); 
mRightButtonImage = typedArray.getDrawable(R.styleable.Titlebar_rightButtonImage); 
typedArray.recycle();//回收 
/*调用方法*/ 
initView(context); 
} 
public MyView(Context context, AttributeSet attrs, int defStyleAttr) { 
this(context, attrs, defStyleAttr,0); 
} 
public MyView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 
super(context, attrs, defStyleAttr, defStyleRes); 
} 
/*构建按钮*/ 
private void initView(Context context) { 
if(mLeftButtonImage == null & mLeftButtonText != null){ 
// 当用户没有设置左侧按钮图片并设置了左侧的按钮文本属性时--添加左侧文本按钮 
mLeftTextView = new TextView(context); 
mLeftTextView.setText(mLeftButtonText); 
mLeftTextView.setTextColor(mLeftButtonTextColor); 
mLeftTextView.setTextSize(mLeftButtonSize); 
mLeftTextView.setBackgroundColor(buttonBgColor); 
RelativeLayout.LayoutParams leftParams = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 
leftParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT); 
leftParams.addRule(RelativeLayout.CENTER_VERTICAL); 
addView(mLeftTextView, leftParams); 
}else if(mLeftButtonImage != null){ 
// 添加左侧图片按钮 
RelativeLayout.LayoutParams leftParams = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 
leftParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT); 
leftParams.addRule(RelativeLayout.CENTER_VERTICAL); 
mLeftButton = new ImageView(context); 
mLeftButton.setImageDrawable(mLeftButtonImage); 
addView(mLeftButton, leftParams); 
} 
if(mTitleButtonText!=null){ 
// 添加中间标题 
titleTextView = new TextView(context); 
titleTextView.setText(mTitleButtonText); 
titleTextView.setTextColor(mTitleButtonTextColor); 
titleTextView.setTextSize(mTitleButtonSize); 
RelativeLayout.LayoutParams titleTextViewParams = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 
titleTextViewParams.addRule(RelativeLayout.CENTER_IN_PARENT); 
addView(titleTextView,titleTextViewParams); 
} 
if(mRightButtonImage == null & mRightButtonText != null){ 
// 当用户没有设置右侧按钮图片并设置了左侧的按钮文本属性时--添加右侧文本按钮 
mRightTextView = new TextView(context); 
mRightTextView.setText(mRightButtonText); 
mRightTextView.setTextColor(mRightButtonTextColor); 
mRightTextView.setTextSize(mRightButtonSize); 
mRightTextView.setBackgroundColor(buttonBgColor); 
RelativeLayout.LayoutParams rightParams = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 
rightParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT); 
rightParams.addRule(RelativeLayout.CENTER_VERTICAL); 
addView(mRightTextView,rightParams); 
}else if(mRightButtonImage != null){ 
// 添加右侧图片按钮 
RelativeLayout.LayoutParams rightParams = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 
rightParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT); 
rightParams.addRule(RelativeLayout.CENTER_VERTICAL); 
mRightButton = new ImageView(context); 
mRightButton.setImageDrawable(mRightButtonImage); 
addView(mRightButton, rightParams); 
} 
} 
/*监听事件*/ 
public interface OnButtonClickListener{ 
void onLeftClick(); 
void onRightClick(); 
} 
/*点击事件*/ 
public void setOnButtonClickListener(final OnButtonClickListener onButtonClickListener) { 
if(onButtonClickListener !=null){ 
if(mLeftTextView != null){ 
mLeftTextView.setOnClickListener(new OnClickListener() { 
@Override 
public void onClick(View v) { 
onButtonClickListener.onLeftClick(); 
} 
}); 
} 
/*按钮*/ 
if(mLeftButton != null){ 
mLeftButton.setOnClickListener(new OnClickListener() { 
@Override 
public void onClick(View v) { 
onButtonClickListener.onLeftClick(); 
} 
}); 
} 
if(mRightTextView != null){ 
mRightTextView.setOnClickListener(new OnClickListener() { 
@Override 
public void onClick(View v) { 
onButtonClickListener.onRightClick(); 
} 
}); 
} 
/*按钮*/ 
if(mRightButton != null){ 
mRightButton.setOnClickListener(new OnClickListener() { 
@Override 
public void onClick(View v) { 
onButtonClickListener.onRightClick(); 
} 
}); 
} 
} 
} 

public class MainActivity extends AppCompatActivity { 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 
/*找到控件*/ 
MyView Myview = (MyView) findViewById(R.id.titlebar); 
/*点击事件*/ 
Myview.setOnButtonClickListener(new MyView.OnButtonClickListener() { 
@Override 
public void onLeftClick() { 
Toast.makeText(MainActivity.this,"左侧按钮被点击了",Toast.LENGTH_SHORT).show(); 
} 
@Override 
public void onRightClick() { 
Toast.makeText(MainActivity.this,"右侧按钮被点击了",Toast.LENGTH_SHORT).show(); 
} 
}); 
} 
}