Android implements a method with border ListView and item _android

The examples in this article describe the way Android implements ListView and item with borders. Share to everyone for your reference, specific as follows:

There are two ways to add a border around ListView and item:

1. Paste a background picture with a border effect

2. Customizing the Draw method

The first method consumes more system resources than the second method, but is simple enough to require only one diagram to be set to the background of the corresponding control, while the second is better.

This is the implementation of the ListView and item with a border, so write a simple demo learning

Let's see how the demo works.

The following is the main code, mainly used to Canvas.drawline (...) The code is simple, and I'm not going to nag.

Borderlistview.java

Package com.borderlistview.manymore13;
Import Android.content.Context;
Import android.content.res.Resources;
Import Android.graphics.Canvas;
Import Android.graphics.Color;
Import Android.graphics.DashPathEffect;
Import Android.graphics.Paint;
Import Android.util.AttributeSet;
Import android.view.MotionEvent;
Import Android.view.View;
Import Android.widget.ListView;
  public class Borderlistview extends listview{public Borderlistview (context) {super (context);
  Public Borderlistview (context, AttributeSet attrs) {Super (context, attrs);
    @Override protected void OnDraw (Canvas Canvas) {Float width = getwidth ();
    Float height= getheight (); int linewidth = 10;
    Line width 10 pixel int graycolor = Color.gray;
    Paint mlinepaint = new Paint ();
    Mlinepaint.setcolor (Graycolor);
    Mlinepaint.setstyle (Paint.Style.STROKE);
    Mlinepaint.setantialias (TRUE);
    Mlinepaint.setstrokewidth (linewidth);
 Draw around the border note the following LINEWIDTH/2 without words around the line may not be as thick   Canvas.drawline (0f, 0+LINEWIDTH/2, Width, 0+LINEWIDTH/2, mlinepaint);
    Canvas.drawline (WIDTH-LINEWIDTH/2, 0, WIDTH-LINEWIDTH/2, height, mlinepaint);
    Canvas.drawline (WIDTH-LINEWIDTH/2, HEIGHT-LINEWIDTH/2, 0, HEIGHT-LINEWIDTH/2, mlinepaint);
    Canvas.drawline (0+LINEWIDTH/2, height, 0+linewidth/2, 0,mlinepaint);
  Super.ondraw (canvas);

 }
}

listviewitem.java   ListView Item to add dashes and red lines

Package com.borderlistview.manymore13;
Import COM.MANYMORE13.MYLISTVIEW.R;
Import Android.content.Context;
Import android.content.res.Resources;
Import Android.graphics.Canvas;
Import Android.graphics.Color;
Import Android.graphics.DashPathEffect;
Import Android.graphics.Paint;
Import Android.view.LayoutInflater;
Import Android.view.View;
Import Android.widget.FrameLayout;
Import Android.widget.RelativeLayout;
 Import Android.widget.TextView;
  public class ListViewItem extends relativelayout{private View viewholder;
  Private TextView Tveventname;
  private context C;
  Private Framelayout Leftframe;
    Public ListViewItem {Super (context);
    Layoutinflater Flater = layoutinflater.from (context);
    Viewholder = Flater.inflate (R.layout.item, this);
    Getviewandsetclick ();
  c = Context;
    private void Getviewandsetclick () {tveventname = (TextView) Viewholder.findviewbyid (r.id.eventname); Leftframe = (framelayout) Viewholder.findviewbyid (r.id.frAME);
  public void Seteventname (String name) {tveventname.settext (name);
  public void Updateview () {this.postinvalidate ();
    } @Override protected void Dispatchdraw (Canvas Canvas) {Super.dispatchdraw (Canvas);
    Resources res = getresources ();
    int graycolor = Color.gray;
    int redcolor = Res.getcolor (r.color.red);
    int leftframepos = Leftframe.getright ();
    Paint mlinepaint = new Paint ();
    Mlinepaint.setcolor (Redcolor);
    Mlinepaint.setstyle (Paint.Style.STROKE);
    Mlinepaint.setstrokewidth (2);
    Draw two straight lines Canvas.drawline (leftframepos+20, 0f, leftframepos+20, GetHeight (), mlinepaint);
    Canvas.drawline (leftframepos+25, 0f, leftframepos+25, GetHeight (), mlinepaint);
    Draw dashed Mlinepaint.setcolor (Graycolor);
    Dashpatheffect effect = new Dashpatheffect (new float[] {5, 5, 5, 5, 5}, 3);
    Mlinepaint.setantialias (TRUE);
    Mlinepaint.setpatheffect (effect); Canvas.drawline (0, GetHeight (), getwidth (), GetHeight (), MlinepaiNT);

 }
}

Mybaseadaper.java

Package com.borderlistview.manymore13;
Import java.util.List;
Import Android.content.Context;
Import Android.os.Handler;
Import Android.view.LayoutInflater;
Import Android.view.View;
Import Android.view.ViewGroup;
Import Android.view.WindowManager;
Import Android.widget.BaseAdapter;
Import Android.widget.ImageView;
  public class Mybaseadaper extends baseadapter{private list<string> List;
  private context C;
    Mybaseadaper (context C, list<string> list) {this.list = list;
  THIS.C = C;
  @Override public int GetCount () {//TODO auto-generated a stub return list.size ();
  @Override public Object getitem (int i) {//TODO auto-generated a stub return list.get (i);
  @Override public long Getitemid (int i) {//TODO auto-generated a stub return i;
    @Override public View GetView (int i, view view, ViewGroup viewgroup) {ListViewItem itemview = null; if (view = = null) {Itemview = new ListviewitEM (c);
    }else{Itemview = (listviewitem) view;
    } itemview.seteventname (List.get (i));
  return itemview;

 }
}

In addition, in the time of the demo, the error was reported, caused By:java.lang.NoSuchMethodException:BorderListView (context,attributeset)

Add a constructor to the Borderlistview class to fix

Public Borderlistview (context, AttributeSet attrs)
{
Super (context, attrs);
}

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I hope this article will help you with the Android program.