兴趣树

MainActivity

public class MainActivity extends AppCompatActivity {

private CustomTreeView cfl_search;
private EditText editText;

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

    cfl_search=findViewById(R.id.cfl_search);
    editText=findViewById(R.id.edit_search);
    init();
}

private void init() {
    findViewById(R.id.iv_search).set Listener(new View. Listener() {
        @Override
        public void  (View v) {
            TextView view = new TextView(MainActivity.this);
            view.setText(editText.getText().toString());
            cfl_search.addView(view);
            cfl_search.invalidate();
        }
    });
}

CustomView

public class CustomTreeView extends LinearLayout {

private Paint paint;

public CustomTreeView(Context context) {
    super(context);
    init();
}

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

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

private void init() {
    setWillNotDraw(false);
    paint = new Paint();
    paint.setColor(Color.BLACK);
    paint.setStyle(Paint.Style.FILL);
    paint.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 childAt = getChildAt(i);
        if(i%2==0){
            left=0;
        }else{
            left=getMeasuredWidth()/2;
        }

        childAt.layout(left,top,left+getMeasuredWidth(),top+getMeasuredHeight());
        top+=childAt.getMeasuredHeight();
    }
}

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    canvas.drawLine(getMeasuredWidth()/2,0,getMeasuredWidth()/2,getMeasuredHeight(),paint);
}

的布局

<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\" />

    <Button
        android:id=\"@+id/iv_search\"
        android:layout_width=\"wrap_content\"
        android:layout_height=\"wrap_content\"
        android:layout_marginLeft=\"10dp\"
        android:text=\"计入\"/>
</LinearLayout>

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

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


</LinearLayout>