day 6

学习简单的自定义控件

顶端导航栏的自定义实现

package Home.widget;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.view.Gravity;

import androidx.annotation.RequiresApi;
import androidx.appcompat.widget.TintTypedArray;
import android.widget.Toolbar;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toolbar;

import com.example.expressdelivery.R;

/**
 * Created by Ivan on 15/9/28.
 */
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
public class CnToolbar extends Toolbar {



    private LayoutInflater mInflater;

    private View mView;
    private TextView mTextTitle;
    private EditText mSearchView;
    private ImageButton mRightImageButton;


    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    public CnToolbar(Context context) {
       this(context,null);
    }

    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    public CnToolbar(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    @SuppressLint("RestrictedApi")
    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    public CnToolbar(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);



        initView();
        setContentInsetsRelative(10,10);




        if(attrs !=null) {
            @SuppressLint("RestrictedApi") final TintTypedArray a = TintTypedArray.obtainStyledAttributes(getContext(), attrs,
                    R.styleable.CnToolbar, defStyleAttr, 0);


            @SuppressLint("RestrictedApi") final Drawable rightIcon = a.getDrawable(R.styleable.CnToolbar_rightButtonIcon);
            if (rightIcon != null) {
                //setNavigationIcon(navIcon);
                setRightButtonIcon(rightIcon);
            }


            @SuppressLint("RestrictedApi") boolean isShowSearchView = a.getBoolean(R.styleable.CnToolbar_isShowSearchView,false);

            if(isShowSearchView){

                showSearchView();
                hideTitleView();

            }


            a.recycle();
        }

    }

    private void initView() {


        if(mView == null) {

            mInflater = LayoutInflater.from(getContext());
            mView = mInflater.inflate(R.layout.toolbar, null);


            mTextTitle = (TextView) mView.findViewById(R.id.toolbar_title);
            mSearchView = (EditText) mView.findViewById(R.id.toolbar_searchview);
            mRightImageButton = (ImageButton) mView.findViewById(R.id.toolbar_rightButton);


            LayoutParams lp = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT, Gravity.CENTER_HORIZONTAL);

            addView(mView, lp);
        }



    }


    public void  setRightButtonIcon(Drawable icon){

        if(mRightImageButton !=null){

            mRightImageButton.setImageDrawable(icon);
            mRightImageButton.setVisibility(VISIBLE);
        }

    }


    public  void setRightButtonOnClickListener(OnClickListener li){

        mRightImageButton.setOnClickListener(li);
    }




    @Override
    public void setTitle(int resId) {

        setTitle(getContext().getText(resId));
    }

    @Override
    public void setTitle(CharSequence title) {

        initView();
        if(mTextTitle !=null) {
            mTextTitle.setText(title);
            showTitleView();
        }





    }



    public  void showSearchView(){

        if(mSearchView !=null)
            mSearchView.setVisibility(VISIBLE);

    }


    public void hideSearchView(){
        if(mSearchView !=null)
            mSearchView.setVisibility(GONE);
    }

    public void showTitleView(){
        if(mTextTitle !=null)
            mTextTitle.setVisibility(VISIBLE);
    }


    public void hideTitleView() {
        if (mTextTitle != null)
            mTextTitle.setVisibility(GONE);

    }


//
//    private void ensureRightButtonView() {
//        if (mRightImageButton == null) {
//            mRightImageButton = new ImageButton(getContext(), null,
//                    android.support.v7.appcompat.R.attr.toolbarNavigationButtonStyle);
//            final LayoutParams lp = generateDefaultLayoutParams();
//            lp.gravity = GravityCompat.START | (Gravity.VERTICAL_GRAVITY_MASK);
//            mRightImageButton.setLayoutParams(lp);
//        }
//    }


}

<?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:layout_width="fill_parent"
    android:layout_height="wrap_content">

    <EditText
        android:id="@+id/toolbar_searchview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_centerVertical="true"
        android:gravity="center"
        android:drawableLeft="@drawable/icon_search"
        style="@style/search_view"
        android:hint="请输入搜索内容"
        android:layout_marginRight="60dp"
        android:visibility="gone"
        />

    <TextView
        android:id="@+id/toolbar_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:layout_gravity="center"
        android:gravity="center"
        android:textColor="@color/white"
        android:textSize="20sp"
        android:visibility="gone"
        />

    <ImageButton
        android:id="@+id/toolbar_rightButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:visibility="gone"
        style="@android:style/Widget.Material.Toolbar.Button.Navigation"
        tools:targetApi="lollipop" />

</RelativeLayout>

效果