Android自定义View之组合控件实现类似电商app顶部栏

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <declare-styleable name="TopBar">
    <attr name="left_text" format="string" />// 左边文字
    <attr name="right_text" format="string" /> // 右边文字
    <attr name="center_text" format="string" />// 中间文字
    <attr name="side_text_size" format="dimension" />//边界按钮大小
    <attr name="center_text_size" format="dimension" />//中间文字大小
    <attr name="text_color" format="color" />//文字颜色
    <attr name="back_color" format="color" />//背景颜色
    <attr name="left_icon" format="reference" />//左边的icon
    <attr name="right_icon" format="reference" />//右边的icon
    <attr name="center_icon" format="reference" />//中间的icon
  </declare-styleable>
</resources>

TypedArray array = getContext().obtainStyledAttributes(attrs, R.styleable.TopBar);
    mLeftText = array.getString(R.styleable.TopBar_left_text);
    mRightText = array.getString(R.styleable.TopBar_right_text);
    mCenterText = array.getString(R.styleable.TopBar_center_text);
    side_text_size = (int) array.getDimension(R.styleable.TopBar_side_text_size, 10);
    center_text_size = (int) array.getDimension(R.styleable.TopBar_center_text_size, 15);
    mLeft_icon = array.getDrawable(R.styleable.TopBar_left_icon);
    mRight_icon = array.getDrawable(R.styleable.TopBar_right_icon);
    mCenter_icon = array.getDrawable(R.styleable.TopBar_center_icon);
    text_color = array.getColor(R.styleable.TopBar_text_color, getResources().getColor(R.color.colorAccent));
    back_color = array.getColor(R.styleable.TopBar_back_color, getResources().getColor(R.color.colorPrimary));
    array.recycle();

//设置内容
mLeftButton = new Button(getContext());//创建按钮
mLeftButton.setText(mLeftText);//设置文字
mLeftButton.setTextSize(side_text_size);//设置文字大小
mLeftButton.setTextColor(text_color);//设置文字颜色
mLeftButton.setBackgroundColor(Color.TRANSPARENT);//设置按钮的背景为透明
LayoutParams leftParams = new LayoutParams(80, 150);//设置布局
mLeft_icon.setBounds(0, 0, 55, 55); //设置icon的大小
mLeftButton.setCompoundDrawables(null, mLeft_icon, null, null); //添加icon
mLeftButton.setGravity(Gravity.CENTER);//设置置中
addView(mLeftButton, leftParams);//添加按钮
//右按钮类似,就不加注释了
mRightButton = new Button(getContext());
mRightButton.setText(mRightText);
mRightButton.setTextSize(side_text_size);
mRightButton.setTextColor(text_color);
mRightButton.setBackgroundColor(Color.TRANSPARENT);
mRight_icon.setBounds(0, 0, 55, 55);
LayoutParams rightParams = new LayoutParams(80, 150);
mRightButton.setCompoundDrawables(null, mRight_icon, null, null);
mRightButton.setGravity(Gravity.CENTER);
addView(mRightButton, rightParams);

mCenterTextView = new TextView(getContext());//初始化TextView
mCenterTextView.setText(mCenterText);//设置文字
mCenterTextView.setTextSize(center_text_size);//设置文字大小
mCenterTextView.setTextColor(text_color);//设置文字颜色
mCenterTextView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);//设置文字靠左
mCenter_icon.setBounds(0, 0, 50, 50);//设置icon大小
mCenterTextView.setCompoundDrawables(mCenter_icon, null, null, null);//添加icon
LayoutParams params = new LayoutParams(0, 70);//创建布局属性  mCenterTextView.setBackground(getResources().getDrawable(R.drawable.bg_search));//设置背景
params.weight = 1;//设置权重
params.gravity = Gravity.CENTER;//设置居中
params.setMargins(10, 0, 10, 0);//设置边界
addView(mCenterTextView, params);//添加

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    int specWidth = MeasureSpec.getSize(widthMeasureSpec);//获取宽度
    int specHeight = MeasureSpec.getSize(heightMeasureSpec);//获取高度
    int heightMode = MeasureSpec.getMode(heightMeasureSpec);//获取高度的测量模式

    int height = 0;//初始化要设置的高度
    if (heightMode == MeasureSpec.EXACTLY) {//如果是确定的值,包括match_parent
      height = specHeight; //最终的值即为测量值
    } else {
      height = 120; //如果不是确定的值就设置为指定的高度
      if (heightMode == MeasureSpec.AT_MOST) {//如果是wrap_content就取测量值和指定值得最小值作为最终的值
        height = Math.min(specHeight, 120);
      }
    }
    setMeasuredDimension(specWidth, height);//设置宽高属性
  }

public interface onClick {
    void onLeftButtonClick();

    void onCenterButtonClick();

    void onRightButtonClick();
  }

private onClick onClick;

  public void setOnClick(TopBar.onClick onClick) {
    this.onClick = onClick;
  }

mLeftButton.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        if (onClick != null) {
          onClick.onLeftButtonClick();
        }
      }
    });
mCenterTextView.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        if (onClick != null) {
          onClick.onCenterButtonClick();
        }
      }
    });
 mRightButton.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        if (onClick != null) {
          onClick.onRightButtonClick();
        }
      }
    });

  <com.brioa.diyviewtest.view.TopBar xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/topBar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    app:center_icon="@mipmap/ic_search"
    app:center_text="输入关键字检索"
    app:center_text_size="10sp"
    app:left_icon="@mipmap/ic_scan"
    app:left_text="扫一扫"
    app:right_icon="@mipmap/ic_msg"
    app:right_text="消息"
    app:side_text_size="6sp"
    app:text_color="#ffff">

  </com.brioa.diyviewtest.view.TopBar>

mTopBar = (TopBar) findViewById(R.id.topBar);
    mTopBar.setOnClick(new TopBar.onClick() {
      @Override
      public void onLeftButtonClick() {
        Toast.makeText(mContext, "LeftClick", Toast.LENGTH_SHORT).show();
      }

      @Override
      public void onCenterButtonClick() {
        Toast.makeText(mContext, "CenterClick", Toast.LENGTH_SHORT).show();

      }

      @Override
      public void onRightButtonClick() {
        Toast.makeText(mContext, "RightClick", Toast.LENGTH_SHORT).show();

      }
    });