Question

public class MainActivity extends Activity {

static final String[] FRUITS = new String[] { "Apple", "Avocado", "Banana",
        "Blueberry", "Coconut", "Durian", "Guava", "Kiwifruit",
        "Jackfruit", "Mango", "Olive", "Pear", "Sugar-apple" };

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    setListAdapter(new ArrayAdapter<String>(this,
        R.layout.activity_main, FRUITS));
    ListView listView = getListView();
    listView.setTextFilterEnabled(true);

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener()
    {
        public void onItemClick(AdapterView<?> parent, View view,
            int position, long id) {
            // When clicked, show a toast with the TextView text
            Toast.makeText(getApplicationContext(),
                    ((TextView) view).getText(), Toast.LENGTH_SHORT).show();
        }
    });

}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

出现以下错误：

Gradle: cannot find symbol method
setListAdapter(android.widget.ArrayAdapter<java.lang.String>)
Gradle: cannot find symbol method getListView()

Answer 1

您的代码以：

开头

公共类MainActivity扩展了Activity {

由于您使用的是getListView（），因此您必须扩展ListActivity。尝试

公共类MainActivity扩展了ListActivity {

Answer 2

扩展listactivity 不是活动因为你使用的是getlistView（）

Answer 3

您应延伸 ListActivity而不是Activity。你的问题应该早就过去了。

Answer 4

试试这个..

 ListView listView = (ListView) findViewById(R.id.list);
        listView.setTextFilterEnabled(true);
        listView.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,FRUITS));

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener()
        {
            public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
                // When clicked, show a toast with the TextView text
                Toast.makeText(getApplicationContext(),
                        ((TextView) view).getText(), Toast.LENGTH_SHORT).show();
            }
        });

Answer 5

示例listactivity代码，根据您的需要进行更改：

文件：res / layout / list_fruit.xml

<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>

文件：ListFruitActivity.java

import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;

public class ListFruitActivity extends ListActivity {

    static final String[] FRUITS = new String[] { "Apple", "Avocado", "Banana",
            "Blueberry", "Coconut", "Durian", "Guava", "Kiwifruit",
            "Jackfruit", "Mango", "Olive", "Pear", "Sugar-apple" };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // no more this
        // setContentView(R.layout.list_fruit);

        setListAdapter(new ArrayAdapter<String>(this, R.layout.list_fruit,FRUITS));

        ListView listView = getListView();
        listView.setTextFilterEnabled(true);

        listView.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // When clicked, show a toast with the TextView text
                Toast.makeText(getApplicationContext(),
                ((TextView) view).getText(), Toast.LENGTH_SHORT).show();
            }
        });

    }

}

Answer 6

你应该扩展 ListActivity而不是Activity，而你的xml listview id必须

    android:id="@android:id/list"

Answer 7

扩展ListActivity而非Activity。

public class MainActivity extends ListActivity { }

在R.layout.activity_main使用<ListView android:id="@android:id/list"/>

为列表创建适配器。（以下只是一个示例来解释。）

 ArrayAdapter arrayAdapter = new ArrayAdapter(this,  // Context.
            ndroid.R.layout.simple_list_item_1, // Specify the row template to use
            your_array);    // your array having data

setListAdapter(arrayAdapter );

找不到onCreate（）中的方法

7 个答案: