自定义_img=findviewbyid(r.id.number.png);-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_41880253/article/details/82343414

package bwie.com.lianxi201830_01;

import android.content.Context;
import android.content.res.TypedArray;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class AddAndDelete extends LinearLayout {

    private ImageView jia_add;
    private ImageView jian_delete;
    private int u;
    private TextView number;

    public AddAndDelete(Context context) {
        this(context,null);
    }

    public AddAndDelete(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs,0);
    }

    public AddAndDelete(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initview(context,attrs);
    }

    private void initview(Context context, AttributeSet attrs) {
        //布局
        inflate(context,R.layout.add_and_delete,this);
        //控件
        jia_add = findViewById(R.id.jia);
        jian_delete = findViewById(R.id.jian);
        number = findViewById(R.id.number);
       //获取属性值
        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.AddAndDelete);
        int numarray = typedArray.getInteger(R.styleable.AddAndDelete_num_shu, 0);
        typedArray.recycle();


        //点击事件
        jia_add.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
            u++;
            number.setText(u+"");
            if (addandDeleteCallback!=null){
              addandDeleteCallback.showNum(u);
            }
            }
        });
        jian_delete.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                if(u>1){
                    u--;
                    number.setText(u+"");
                    if (addandDeleteCallback!=null){
                        addandDeleteCallback.showNum(u);
                    }
                }
            }
        });


    }
    private AddandDeleteCallback addandDeleteCallback;

    public void setAddandDeleteCallback(AddandDeleteCallback addandDeleteCallback) {
        this.addandDeleteCallback = addandDeleteCallback;
    }

    public interface AddandDeleteCallback{
    void showNum(int shopNum);
}

}

package bwie.com.lianxi201830_01;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private MyShapeView myShapeView ;
    private MyView myView;
    private AddAndDelete addAndDelete;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        myShapeView = findViewById(R.id.my_shape);

        myShapeView.setSearchLinstener(new MyShapeView.SearchLinstener() {
            @Override
            public void onSearch(String context) {
                Toast.makeText(MainActivity.this, "搜索内容是：" + context, Toast.LENGTH_SHORT).show();
            }
        });

        myView = findViewById(R.id.myview);
        myView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(MainActivity.this,ThirdActivity.class);
                startActivity(intent);
            }
        });


        addAndDelete = findViewById(R.id.adddelete);
        addAndDelete.setAddandDeleteCallback(new AddAndDelete.AddandDeleteCallback() {
            @Override
            public void showNum(int shopNum) {
             Toast.makeText(MainActivity.this,"当前商品数量是"+shopNum,Toast.LENGTH_SHORT).show();
            }
        });

    }
}

package bwie.com.lianxi201830_01;

import android.content.Context;
import android.content.res.TypedArray;
import android.support.annotation.Nullable;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;

public class MyShapeView extends LinearLayout {

    private ImageView t_img;
    private EditText t_edit;
    private TypedArray typedArray;
    private String typestring = "";

    public MyShapeView(Context context) {
        this(context,null);
    }

    public MyShapeView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs,0);
    }

    public MyShapeView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);



        //布局
        inflate(context,R.layout.title_tou,this);
        //控件
        t_img = findViewById(R.id.t_img1);
        t_edit = findViewById(R.id.t_edit);
        //读取属性
        typedArray = context.obtainStyledAttributes(attrs, R.styleable.MySearchView);
        typestring = typedArray.getString(R.styleable.MySearchView_search_hint);
        typedArray.recycle();
       // 把读取到的属性值设置到 显示页面
        if (!TextUtils.isEmpty(typestring)) {
            t_edit.setHint(typestring);
        }


        //设置点击事件
        t_img.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
        if (searchLinstener!=null){
            String editstring = t_edit.getText().toString();
            if (!TextUtils.isEmpty(editstring)){
              searchLinstener.onSearch(editstring);
              }
             }
            }
        });
    }

    private SearchLinstener searchLinstener;

    public void setSearchLinstener(SearchLinstener searchLinstener) {
        this.searchLinstener = searchLinstener;
    }
    public interface SearchLinstener{
        void onSearch(String context);
    }

}

package bwie.com.lianxi201830_01;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;

public class MyView extends View {

    private Paint paint;

    public MyView(Context context) {
        super(context);
    }

    public MyView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        paint = new Paint();
        paint.setColor(Color.RED);
    }

    public MyView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawCircle(100,100,60,paint);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}

package bwie.com.lianxi201830_01;

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;

public class ThirdActivity extends AppCompatActivity {

    private ThridLayout thridLayout;
    private Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_third);
        thridLayout = findViewById(R.id.flowlayout);
        button = findViewById(R.id.btn_remeasure);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                thridLayout.requestLayout();
            }
        });
    }
}

package bwie.com.lianxi201830_01;

import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;

public class ThridLayout extends ViewGroup{
    private static final String TAG = "ThridLayout";
    public ThridLayout(Context context) {
        this(context,null);
    }

    public ThridLayout(Context context, AttributeSet attrs) {
        this(context, attrs,0);
    }

    public ThridLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }
    //画布
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        Log.i(TAG,"onDraw");
    }
//    //测量
//    @Override
//    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
//        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
//        Log.i(TAG,"onMeasure");
//    }

    //布局
    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        Log.i(TAG,"onLayout") ;
        int childCount = getChildCount();
        int measuredWidth = getMeasuredWidth();
        int measuredHeight = getMeasuredHeight();
        measureChildren(measuredWidth,measuredHeight);
        int mpleft=0;
        int mptop=0;
        int maxHeight=0;
        for (int i = 0; i < childCount; i++) {
            View v = getChildAt(i);
            maxHeight = Math.max(maxHeight, v.getMeasuredHeight());
            //换行
            if (mpleft+v.getMeasuredWidth()>measuredWidth){
                mpleft=0;
                mptop+=maxHeight;
                maxHeight=0;
            }
            v.layout(mpleft,mptop,mpleft+v.getMeasuredWidth(),mptop+v.getMeasuredHeight());
            mpleft+=v.getMeasuredWidth();
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Button
        android:id="@+id/btn_remeasure"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="点" />

<bwie.com.lianxi201830_01.ThridLayout
        android:id="@+id/flowlayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#00FF00">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:text="电子"
            android:textSize="20sp"
            />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:text="衣服"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:text="手机"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:text="电脑"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:text="电脑"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:text="电脑"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:text="电脑"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:text="电脑"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:text="电脑"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:text="电脑"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:text="电脑"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:text="电脑"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:text="手机"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:text="手机哈哈"
            android:textSize="20sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:text="手机啊 "
            android:textSize="20sp" />


        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:text="手机人人"
            android:textSize="20sp" />

</bwie.com.lianxi201830_01.ThridLayout>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:background="@drawable/shape_bg"
    android:gravity="center"
    android:layout_height="wrap_content">
<ImageView
    android:id="@+id/t_img1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/a_4"
    android:padding="8dp"
    />
    <EditText
        android:id="@+id/t_edit"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:background="@null"
        android:hint="京东抢购日"

        />
    <ImageView
        android:id="@+id/t_img2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/root"
        android:padding="8dp"
        />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

   <bwie.com.lianxi201830_01.MyShapeView
    android:id="@+id/my_shape"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
   </bwie.com.lianxi201830_01.MyShapeView>

 <bwie.com.lianxi201830_01.MyView
    android:id="@+id/myview"
    android:layout_width="match_parent"
    android:layout_height="150dp" />
<bwie.com.lianxi201830_01.AddAndDelete
    android:id="@+id/adddelete"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
</bwie.com.lianxi201830_01.AddAndDelete>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <!-- 自定义属性 -->
    <declare-styleable name="MySearchView">
        <attr name="search_hint" format="string" />
    </declare-styleable>
      <declare-styleable name="AddAndDelete">
          <attr name="num_shu" format="integer"/>
      </declare-styleable>
</resources>