兴趣树

1.Activity页面

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();
        }
    });
}
}

2.自定义view

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);
}
}

3. 布局

<?  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.bawei.myshopcar.tree.CustomTreeView
    android:id=\"@+id/cfl_search\"
    android:layout_width=\"match_parent\"
    android:layout_height=\"wrap_content\"
    android:layout_marginTop=\"10dp\" />


</LinearLayout>