Android自定义view实现TopBar效果

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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(); 
      } 
    }); 
 
  } 
}