Android自定义通用标题栏CustomTitleBar

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public class CustomerTitleBar extends LinearLayout {
private LinearLayout rootView;
private ImageView ivLeft;
private TextView tvTitle;
private TextView tvRight;
//3.声明回调对象
private CustomerClick leftClick;

/**
 * @param context
 */
//在代码中直接new一个Custom View实例的时候,会调用第一个构造函数
public CustomerTitleBar(Context context) {
 this(context,null);
}

//在xml布局文件中调用Custom View的时候,会调用第二个构造函数
public CustomerTitleBar(Context context,AttributeSet attrs) {
 this(context, attrs,-1);
}

//在xml布局文件中调用Custom View,并且Custom View标签中还有自定义属性时,这里调用的还是第二个构造函数.
public CustomerTitleBar(Context context,AttributeSet attrs, int defStyleAttr) {
 super(context, attrs, defStyleAttr);
 init(context);
 initAttrs(context,attrs);
 initLister();
}

private void init(Context context) {
 rootView= (LinearLayout) View.inflate(context,R.layout.layout_customer_title_bar,this);
 ivLeft=rootView.findViewById(R.id.ivLeft);
 tvTitle=rootView.findViewById(R.id.tvTitle);
 tvRight=rootView.findViewById(R.id.tvRight);
}

private void initAttrs(Context context, AttributeSet attrs) {
 TypedArray typedArray=context.obtainStyledAttributes(attrs,R.styleable.CustomerTitleBar);
 Drawable drawable=typedArray.getDrawable(R.styleable.CustomerTitleBar_left_image);
 if (drawable!=null){
  ivLeft.setImageDrawable(drawable);
 }
 CharSequence text = typedArray.getText(R.styleable.CustomerTitleBar_center_text);
 if (!TextUtils.isEmpty(text)) {
  tvTitle.setText(text);
 }
 int color = typedArray.getColor(R.styleable.CustomerTitleBar_center_text_color, -1);

 if (color != -1) {
  tvTitle.setTextColor(color);
 }

 float dimension = typedArray.getDimension(R.styleable.CustomerTitleBar_center_text_size, 0f);

 tvTitle.setTextSize(dimension);
}

private void initLister() {
 ivLeft.setOnClickListener(new OnClickListener() {
  @Override
  public void onClick(View v) {
   //5.使用接口回调
   if (leftClick!=null){
    leftClick.onLefClick(v);
   }
  }
 });
}
//4、提供回调对象的set方法
public void setLeftClick(CustomerClick leftClick) {
 this.leftClick = leftClick;
}
//1.定义回调接口
interface CustomerClick{
 void onLefClick(View view);
}
}

public class MainActivity extends AppCompatActivity {
 private CustomerTitleBar ctTitle;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  ctTitle=findViewById(R.id.ctTitle);
  //6、使用
  ctTitle.setLeftClick(new CustomerTitleBar.CustomerClick() {
   @Override
   public void onLefClick(View view) {
    Toast.makeText(MainActivity.this,"吐泡泡",Toast.LENGTH_LONG).show();
   }
  });
}
}