Question

在我和roid的申请中,我有一份名单和一个名单标题。 a. 清单负责人一使用这一规定:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent" android:layout_height="?android:attr/listPreferredItemHeight"
    android:weightSum="1">

    <TextView android:text="#" android:layout_height="wrap_content"
        android:layout_width="0dp" android:background="@drawable/back"
        android:layout_weight=".05" android:gravity="center_horizontal"
        android:id="@+id/header_num"/>:
    <TextView android:text="Summary" android:layout_height="wrap_content"
        android:layout_width="0dp" android:background="@drawable/back"
        android:layout_weight=".55" android:gravity="center_horizontal"
        android:id="@+id/header_summ" />
</LinearLayout>

for android:background="@drawable/back>:

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="#ffffff" />
    <stroke android:width="1dip" android:color="#4fa5d5" />


</shape>

现在,根据标题项目,将清单项目分类如下:

ticketnum = (TextView) findViewById(R.id.header_num);
        ticketnum.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {

                Comparator<Ticket> mc;
                mc = new TicketIdComparator();
                Collections.sort(tickets, mc);
                System.out.println(tickets);
                ticket_adapter = new TicketAdapter(getApplicationContext(),
                        R.layout.ticket_details_row, tickets);
                setListAdapter(ticket_adapter);

                ticket_adapter.notifyDataSetChanged();

            }
        });

现在,我只想在座头上看到两幅图像,一个向上和向下arrow,以显示分崩解。

请说明如何添加这两个图像。

感谢。

Answer 1

你可以arrow笑案文左边(这样看一看......) 我认为这是你们想要的吗?

首先在你手提的翻了一番,叫它上Arrow.png,并增加一个叫倒的Arrow。

接着,把arrow弄到案文左边。观点案文:

myTextView.setCompoundDrawablesWithIntrinsicBounds(R.drawable.upArrow, 0, 0, 0);

See setCompoundDrawablesWithIntrinsicBounds(int left, int top, int right, int bottom) Use the other arguments to set your arrow above, right, or below the text.

现在,如果你想要改变背景形象(例如放弃R.drawable.back),那么你也将首先拯救Arrow。页: 1

myTextView.setBackgroundDrawable(R.drawable.upArrow);

See setBackgroundDrawble(Drawable d)

此外,注意到(自2.1起)你可以在你的XML中呼吁你的速记员。这将使法典更加清洁。在您的案例中,在座各位中,还有一位在座的听众:

 <TextView 以及roid:text="#" 以及roid:layout_height="wrap_content"
        以及roid:layout_width="0dp" 以及roid:background="@drawable/back"
        以及roid:layout_weight=".05" 以及roid:gravity="center_horizontal"
        以及roid:id="@+id/header_num" 
        以及roid:onClick="myOnclickListener"/>

Then in your Activity class simply add the method:

public void myOnclickListener(View v) {
    ...
}

You could also programmatically add an imageView, though this is more involved. Or you can add in both the imageViews of up 以及 down arrows next to each header, 以及 turn the visibilities on 以及 off for the appropriate once programatically using:

myImageView.setVisibility(View.VISIBLE);

以及

myImageView.setVisibility(View.GONE);

Though I think using bg images or left drawables is the easiest 以及 keeps your xml minimal. If you actually add imageViews, you d probably want to switch to RelativeLayout.

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