我的智慧树

布局
activity_tree

<?  version=\"1.0\" encoding=\"utf-8\"?>
<LinearLayout  ns:android=\"http://schemas.android.com/apk/res/android\"
     ns:app=\"http://schemas.android.com/apk/res-auto\"
    android:layout_width=\"match_parent\"
    android:layout_height=\"match_parent\"
    android:orientation=\"vertical\"
    android:paddingLeft=\"20dp\"
    android:paddingRight=\"20dp\">

    <LinearLayout
        android:layout_width=\"match_parent\"
        android:layout_height=\"wrap_content\"
        android:gravity=\"center\"
        android:orientation=\"horizontal\"
        android:padding=\"10dp\">

        <EditText
            android:id=\"@+id/edit_search\"
            android:layout_width=\"200dp\"
            android:layout_height=\"wrap_content\" />

        <ImageView
            android:id=\"@+id/iv_search\"
            android:layout_width=\"30dp\"
            android:layout_height=\"30dp\"
            android:layout_marginLeft=\"10dp\"
            android:background=\"@mipmap/search\" />
    </LinearLayout>

    <TextView
        android:layout_width=\"match_parent\"
        android:layout_height=\"wrap_content\"
        android:text=\"搜索历史\"
        android:textColor=\"#00ff00\" />


    <com.example.huyuanyuan.CustomTreeView
        android:id=\"@+id/cfl_search\"
        android:layout_width=\"match_parent\"
        android:layout_height=\"wrap_content\"
        android:layout_marginTop=\"10dp\" />


</LinearLayout>

自定义View
CustomTreeView

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
import android.widget.LinearLayout;

public class CustomTreeView extends LinearLayout {
    private Paint mPaint;

    public CustomTreeView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init(){
        setWillNotDraw(false);
        mPaint = new Paint();
        mPaint.setColor(Color.BLACK);
        mPaint.setStyle(Paint.Style.FILL);
        mPaint.setStrokeWidth(3);
    }

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

        int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
        measureChildren(widthMeasureSpec, heightMeasureSpec);
        int childCount = getChildCount();
        int bottom = 0;
        for (int i = 0; i < childCount; i++) {
            View view = getChildAt(i);
            bottom += view.getMeasuredHeight();
        }

        setMeasuredDimension(sizeWidth, bottom);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        int left = 0, top = 0;

        int childCount = getChildCount();
        for (int i = 0; i < childCount; i++) {
            View view = getChildAt(i);

            if (i % 2 == 0) {
                left = 0;
            } else {
                left = getMeasuredWidth() / 2;
            }

            view.layout(left, top, left + getMeasuredWidth() / 2, top + view.getMeasuredHeight());
            top += view.getMeasuredHeight();
        }
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        canvas.drawLine(getMeasuredWidth() / 2, 0, getMeasuredWidth() / 2, getMeasuredHeight(), mPaint);
    }
}

主页面
TreeActivity

import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class TreeActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tree);

        initView();
    }

    private void initView() {
        final CustomTreeView customTreeView = findViewById(R.id.cfl_search);
        final EditText editText = findViewById(R.id.edit_search);
        findViewById(R.id.iv_search).set Listener(new View. Listener() {
            @Override
            public void  (View v) {
                TextView tv = new TextView(TreeActivity.this);
                tv.setTextColor(Color.RED);
                tv.setText(editText.getText());
                tv.setBackgroundResource(R.drawable.search_history_bg);
                customTreeView.addView(tv);
                customTreeView.invalidate();
            }
        });
    }
}

圆角
yuan_jiao.

<?  version=\"1.0\" encoding=\"utf-8\"?>
<shape  ns:android=\"http://schemas.android.com/apk/res/android\">

 <!--   圆角四个角的圆弧弧度-->
    <corners android:radius=\"10px\"/>

    <!-- 以下是边框属性-->
   <stroke
       android:width=\"1px\"
       android:color=\"#999999\"
       />

</shape>