以编程方式在Android上绘制虚线

我想在编程生成的TextViews之间绘制水平虚线.我试过这段代码:

Paint fgPaintSel = new Paint();
fgPaintSel.setARGB(255, 0, 0, 0);
fgPaintSel.setStyle(Paint.Style.STROKE);
fgPaintSel.setPathEffect(new DashPathEffect(new float[]{5, 10}, 0));

但什么都没发生.我只是复制并粘贴了这段代码.我该怎么画一条虚线？谢谢.

为活动布局指定一个ID.我使用onLlick处理程序PaintDashedLines()使用了一个按钮进行演示.

在content_main.xml布局中.

使用静态int来计算demo的目的,使用单独的方法来创建drawable,用于模块化.

在您的活动中:

static int tvCount = 0;

public void PaintDashedLines(View v) {
    LinearLayout ll = (LinearLayout) findViewById(R.id.main);
    TextView tv = new TextView(MainActivity.this);
    tv.setGravity(Gravity.CENTER);
    tv.setTextSize(25);
    tv.setPadding(0, 5, 0, 5);
    ll.addView(tv);
    tv.setText("TextView " + tvCount);
    ImageView divider = new ImageView(MainActivity.this);
    LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
            ll.getWidth(), 2);
    lp.setMargins(0, 5, 0, 5);
    divider.setLayoutParams(lp);
    divider.setBackground(CreateDashedLined());
    ll.addView(divider);
    tvCount++;
}

public static Drawable CreateDashedLined() {
    ShapeDrawable sd = new ShapeDrawable(new RectShape());
    Paint fgPaintSel = sd.getPaint();
    fgPaintSel.setColor(Color.BLACK);
    fgPaintSel.setStyle(Paint.Style.STROKE);
    fgPaintSel.setPathEffect(new DashPathEffect(new float[]{5, 10}, 0));
    return sd;
}

-MyActivity
--int count;
--oncreate
--PaintDashedLines(View v) -
public static Drawable CreateDashedLined()

在build.gradle中(虽然这不是一成不变的)

    minSdkVersion 18
    targetSdkVersion 23

你不需要做任何其他事情.

在drawable文件夹中创建dotted_line.xml文件:

添加此drawable作为背景:

view.setBackground(getResources().getDrawable(R.drawable.dotted_line));

结果: