自定义view——TopBar

布局文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"

    android:layout_height="match_parent"
    android:background="#f00">

    <Button
        android:id="@+id/left_img"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true" />

    <TextView
        android:id="@+id/left_text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_toRightOf="@id/left_img"
        android:padding="10dp"
        android:textSize="20sp" />

    <TextView
        android:id="@+id/title_text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:padding="10dp"
        android:textSize="20sp" />

    <TextView
        android:id="@+id/right_text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:padding="10dp"
        android:textSize="20sp" />


</RelativeLayout>

topbar控件：

          控件名：包名.类名

<com.skr.MyToaBar
        android:id="@+id/my_topBar"
        android:layout_width="wrap_content"
        android:layout_weight="1"
        android:layout_height="0dp"
        app:left_background="@drawable/left_selector"
        app:left_text="返回"
        app:right_text="提交"
        app:text_color="#fff"
        app:title_text="首页"/>

创建topbar类

   切记：一定在带有两个参数中操作

public class MyToaBar extends RelativeLayout {

    private Button left_img;
    private TextView left_text_view;
    private TextView title_text_view;
    private TextView right_text_view;
    private OnTopBarClickListen topBarClickListen;
    public MyToaBar(Context context) {
        super(context);
    }
    //设置监听器
    public void setMyTopBarOnClickListener(OnTopBarClickListen topBarOnClickListener){
        this.topBarClickListen = topBarOnClickListener;
    }
    //定义接口
    public interface OnTopBarClickListen{
        void onLeftClick();
    }

    public MyToaBar(Context context, AttributeSet attrs) {
        super(context, attrs);
        LayoutInflater.from(context).inflate(R.layout.mytopbar_layout,this);
        left_img = findViewById(R.id.left_img);
        left_text_view = findViewById(R.id.left_text_view);
        title_text_view = findViewById(R.id.title_text_view);
        right_text_view = findViewById(R.id.right_text_view);
        left_img.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {

            }
        });


        //获取自定义属性big赋值
        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.MyTopBar);
        int left_background = typedArray.getResourceId(R.styleable.MyTopBar_left_background, 0);
        String left_text = typedArray.getString(R.styleable.MyTopBar_left_text);
        String title_text = typedArray.getString(R.styleable.MyTopBar_title_text);
        String right_text = typedArray.getString(R.styleable.MyTopBar_right_text);
        int color = typedArray.getColor(R.styleable.MyTopBar_text_color,0);

        //释放资源
        typedArray.recycle();
        left_img.setBackgroundResource(left_background);
        left_text_view.setText(left_text);
        title_text_view.setText(title_text);
        right_text_view.setText(right_text);
        left_text_view.setTextColor(color);
        title_text_view.setTextColor(color);
        right_text_view.setTextColor(color);
    }

    public MyToaBar(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public MyToaBar(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }
}

activity类

public class MainActivity extends AppCompatActivity {

    private TopBar top_bar;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        top_bar = findViewById(R.id.top_bar);
        top_bar.setLeftAndRightOnClickListener(new TopBar.OnAttsClickLisener() {
            @Override
            public void onLeftClick() {
               
            }

            @Override
            public void onRightClick() {
                
            }
        });
    }
}