Question

我喜欢将addTextChangedListener添加到我的listView中，但在运行之后，它不会在屏幕上显示任何内容，只是一个空白屏幕。 logcat也只给出了一个标签，它是“ActivityThread.performLaunchAcitvity（ActivityThread $ ActivityClientRecord，Intent）line：2205”，下面显示“Source not found”，带有一个按钮（Edit Source Lookup Path）。我已经尝试了一些方法，但到目前为止找不到让它工作的方法..

这是MainActivity：

public class MainActivity extends ListActivity {

ListView lv;
EditText inputSearch;
DefaultHttpClient httpclient;
HttpPost httppost;
HttpResponse response;
InputStream is;
BufferedReader reader;
StringBuilder sb;
String line,result;
String[] people;


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);          

    getList();

    lv= (ListView) findViewById(R.id.list_view);
    inputSearch= (EditText) findViewById(R.id.inputSearch);

    inputSearch.addTextChangedListener(new TextWatcher() {
        public void afterTextChanged(Editable s) {
            if(s.length()==0){
                lv.clearTextFilter();
            }
        }
        public void beforeTextChanged(CharSequence s, int start, int count, int after){
        }
        public void onTextChanged(CharSequence s, int start, int before, int count)
        {
            lv.setTextFilterEnabled(true);
            lv.setFilterText(s.toString());
        }

    });
}

public void getList(){
    new Thread(){
        public void run(){
            try{
                 httpclient = new DefaultHttpClient();
                 httppost = new HttpPost("http://www.kryptoquest.com/testing/testList.php");
                 response = httpclient.execute(httppost);
                 is = response.getEntity().getContent();
            }catch(Exception e){
                Log.e("log_tag", "Error:"+e.toString());
            }

            //convert response to string
            try{
                    reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
                    sb = new StringBuilder();
                    line = null;
                    while ((line = reader.readLine()) != null) {

                            sb.append(line + "\n");

                    }
                    Log.d("test",sb.toString());
                    is.close();

                    result = sb.toString();

                    people = result.split("[*]");

                    runOnUiThread(new Runnable()
                    {
                        public void run(){
                            ArrayAdapter<String> list = new ArrayAdapter<String>(MainActivity.this,R.layout.list_item, R.id.user_name,people);
                            lv.setAdapter(list); 
                        }
                    });


            }catch(Exception e){
                    Log.e("log_tag", "Error converting result "+e.toString());
            }
        }
    }.start();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}
}

activity_main.xml中：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">

 <!--Editext for Search -->
<EditText android:id="@+id/inputSearch"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:hint="Search.."
    android:inputType="textVisiblePassword"/>

<!--List View -->
<ListView
    android:id="@+id/list_view"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />

</LinearLayout>

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="vertical" >

<!--Single ListItem -->

<!--User Name -->
<TextView android:id="@+id/user_name"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:padding="10dip"
    android:textSize="16dip"
    android:textStyle="bold"/>   

</LinearLayout>

另外，我在其Manifest中添加了uses-permission android：name =“android.permission.INTERNET”＆gt;。

提前致谢。

Answer 1

从您的LogCat：

Your content must have a ListView whose id attribute is 'android.R.id.list'

这意味着将ListView的id更改为：

<!--List View -->
<ListView
    android:id="@android:id/list"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />

ListActivities要求布局中的ListView具有此确切ID。

如何正确地将addTextChangedListener添加到listView中？

1 个答案: