我创建一个简单的ListView的应用程序，以了解更多关于编程的机器人。
然而，这个简单的代码（该图是在Eclipse中没有任何错误）简单地拍击在模拟器启动。 有任何想法吗？
public class MainActivity extends Activity {
static final String[] FRUITS = { "Apple", "Avocado", "Banana",
"Blueberry", "Coconut", "Durian", "Guava", "Kiwifruit",
"Jackfruit", "Mango", "Olive", "Pear", "Sugar-apple" };
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list_fruit);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.list_fruit, FRUITS);
ListView listView = (ListView) findViewById(R.layout.list_fruit);
listView.setTextFilterEnabled(true);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(getApplicationContext(), ((TextView) view).getText(), Toast.LENGTH_SHORT).show();
}
});
}
}
list_fruit.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="10dp"
android:textSize="20sp" >
</TextView>
试图找到下列您的指示堆栈跟踪，即AME了国内唯一的消息是致命的异常：主要的。
更改此
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.list_fruit, FRUITS);
至
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, FRUITS);
你有
setContentView(R.layout.list_fruit); // list_fruit.xml
并使用相同的ArrayAdapter
也改变
ListView listView = (ListView) findViewById(R.layout.list_fruit);
至
ListView listView = (ListView) findViewById(R.id.listview);
也改变
Toast.makeText(getApplicationContext(),FRUITS[postion], Toast.LENGTH_SHORT).show();
编辑： list_fruit.xml没有一个ListView。
您需要在以下list_fruit.xml
<ListView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/listview"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
然后在onCreate
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list_fruit);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, FRUITS);
ListView listView = (ListView) findViewById(R.id.listview);
listView.setTextFilterEnabled(true);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(getApplicationContext(),FRUITS[postion], Toast.LENGTH_SHORT).show();
}
});
}
这个：
ListView listView = (ListView) findViewById(R.layout.list_fruit);
是错误的，肯定的，因为你需要查找id与findViewById，因此，例如像这样，但你需要确保关于有与ID，然后在列表视图元素：
ListView listView = (ListView) findViewById(R.id.the_id_of_your_view);
举例来说，这是错误的：
ListView listView = (ListView) findViewById(R.layout.list_fruit);
它应该是这样的：
ListView listView = (ListView) findViewById(R.id.my_list_fruit);
其中my_list_fruit只是机器人：在XML分配的ID标签：
<ListView
android:id="@+id/my_list_fruit"
.../>
试试这个，采用了android simple_list_view_1
public class MainActivity extends Activity {
static final String[] FRUITS = { "Apple", "Avocado", "Banana",
"Blueberry", "Coconut", "Durian", "Guava", "Kiwifruit",
"Jackfruit", "Mango", "Olive", "Pear", "Sugar-apple" };
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list_fruit);
ListView listView = (ListView) findViewById(R.id.list_fruit);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, FRUITS);
listView.setTextFilterEnabled(true);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(getApplicationContext(), ((TextView) view).getText(), Toast.LENGTH_SHORT).show();
}
});
}
}
或定义与它的前一个TextView的list_item.xml：
MainActivity.java
public class MainActivity extends Activity {
static final String[] FRUITS = { "Apple", "Avocado", "Banana", "Blueberry",
"Coconut", "Durian", "Guava", "Kiwifruit", "Jackfruit", "Mango",
"Olive", "Pear", "Sugar-apple" };
private ListView listView;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list_fruit);
listView = (ListView) findViewById(R.id.list_fruit);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
R.layout.list_item, R.id.textView1, FRUITS);
listView.setTextFilterEnabled(true);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Toast.makeText(getApplicationContext(),
listView.getItemAtPosition(position).toString(),
Toast.LENGTH_SHORT).show();
}
});
}}
list_fruit.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<ListView
android:id="@+id/list_fruit"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true" >
</ListView>
</RelativeLayout>
list_item.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="horizontal" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>
