Right click to class name, New>
Class, name it forth, finish.
Edit code to make it like this
public class forth extends Activity {
@Override
protected void onCreate(Bundle
savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.ac4);
}
}
Ignore red mark at ac4,
we create it now.
Right click to folder layout, New
> Android XML File, name it ac4, finish.
Copy in to file ac4.xml
<?xml
version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<ListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="2dp"
android:divider="#ff8f40"
android:dividerHeight="1px"
android:lineSpacingExtra="-8dp"
android:singleLine="true"
android:textColor="#00F"
>
</ListView>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="5dp"
android:text="This is
ListView"
android:textColor="#800000"
android:textSize="20sp"
/>
</LinearLayout>
Double click file
AndroidManifest.xml to declare class forth, exactly it ‘s name.
Back to class forth.
First declare a ListView, array and
adapter, find address.
String[] fru = { "Pear","Banana", "Cashew", "Orange", "Water
melon", "Peach", "Grape", "Mango", "Plum" };
private
ArrayAdapter<String> adapter;
Screen now like this.
Add mode choice for List.
lv.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
Set
adapter to show list.
adapter = new
ArrayAdapter<String>(forth.this,
android.R.layout.simple_list_item_checked, fru);
lv.setOnItemClickListener(new
OnItemClickListener() {
@Override
public void
onItemClick(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
}
});
lv.setAdapter(adapter);
Press Ctrl+Shift+O to import
library. Class forth now look like this.
Back to MainActivity change code in
Next button to.
Intent in = new Intent(MainActivity.this,forth.class);
startActivity(in);
Run, press next, screen look like
this.
Check to list to see green
checkmark.
Add this in to setOnItemClickListener,
we will
show a toast when click list row.
int row = arg2;
Toast.makeText(forth.this, "You press the line "+row,
Toast.LENGTH_SHORT).show();
Run and press first row, it show
line 0, the first element of array, to see true index line, we add row=arg2+1.
In real app, we can do anything when
click list row, for example, open a new screen.
To remove app name on top screen,
add to above setContentView(R.layout.ac4);
requestWindowFeature(Window.FEATURE_NO_TITLE);
Import library, run to see result.
Back to file ac4.xml, let look at android:textColor="#00F"
We color string to blue but why it
still black? Because you can’t color string listview in file xml. We must use
another way, see in topic about Listview.
Now you can go to make android app and
code a real app.
