关于MultiAutoCompleteTextView [英] about MultiAutoCompleteTextView

问题描述

 public class testMultiAutoCompleteTextView extends ListActivity  {
/** Called when the activity is first created. */
private MultiAutoCompleteTextView searchEdit;
 Button   okButton;
private ArrayAdapter<String> adapter = null;

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

    adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, mStrings);

   setListAdapter(adapter);

    searchEdit = (MultiAutoCompleteTextView) findViewById(R.id.search_box);

    searchEdit.addTextChangedListener(filterTextWatcher);

    searchEdit.setTokenizer(new SpaceTokenizer());

    searchEdit.setAdapter(adapter);

    searchEdit.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            String t = ((TextView) v).getText().toString();
            String f = searchEdit.getText().toString();

            int s = searchEdit.getSelectionStart();
            int i = s;

            while (i > 0 && f.charAt(i - 1) != ' ') {
                i--;
            }

            adapter.getFilter().filter(t.substring(i, s));
        }
    });

    okButton = (Button) findViewById(R.id.ok);
    okButton.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            Bundle stats = new Bundle();
            stats.putString("ConversationName", searchEdit.getText()
                    .toString());

            Intent i = new Intent();
            i.putExtras(stats);
            setResult(RESULT_OK, i);
            finish();
        }
    });

    searchEdit.setOnKeyListener(new OnKeyListener() {

        public boolean onKey(View v, int keyCode, KeyEvent event) {
            if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT
                    || keyCode == KeyEvent.KEYCODE_DPAD_RIGHT
                    || keyCode == KeyEvent.KEYCODE_DPAD_UP
                    || keyCode == KeyEvent.KEYCODE_DPAD_DOWN) {

                String t = ((TextView) v).getText().toString();
                String f = searchEdit.getText().toString();

                int s = searchEdit.getSelectionStart();
                int i = s;

                while (i > 0 && f.charAt(i - 1) != ' ') {
                    i--;
                }

                adapter.getFilter().filter(t.substring(i, s));

                return false;
            }

            return false;
        }
    });

    getListView().setOnItemClickListener(
            new ListView.OnItemClickListener() {
                public void onItemClick(AdapterView<?> parent, View view,
                        int position, long id) {

                    String t = adapter.getItem(position);
                    String f = searchEdit.getText().toString();

                    int s = searchEdit.getSelectionStart();
                    int i = s;

                    while (i > 0 && f.charAt(i - 1) != ' ') {
                        i--;
                    }

                    searchEdit.getText().insert(s, t.substring(s - i));
                }
            });
}


    @Override
protected void onDestroy() {
    super.onDestroy();
    searchEdit.removeTextChangedListener(filterTextWatcher);
}


private TextWatcher filterTextWatcher = new TextWatcher() {

    public void afterTextChanged(Editable s) {
        okButton.setEnabled(searchEdit.getText().toString().trim()
                .length() > 0);
    }

    public void beforeTextChanged(CharSequence s, int start, int count,
            int after) {
    }

    public void onTextChanged(CharSequence s, int start, int before,
            int count) {
        adapter.getFilter().filter(s);
    }

};



public class SpaceTokenizer implements Tokenizer {

public int findTokenStart(CharSequence text, int cursor) {
    int i = cursor;

    while (i > 0 && text.charAt(i - 1) != ' ') {
        i--;
    }
    while (i < cursor && text.charAt(i) == ' ') {
        i++;
    }

    return i;
}

public int findTokenEnd(CharSequence text, int cursor) {
    int i = cursor;
    int len = text.length();

    while (i < len) {
        if (text.charAt(i) == ' ') {
            return i;
        } else {
            i++;
        }
    }

    return len;
}

public CharSequence terminateToken(CharSequence text) {
    int i = text.length();

    while (i > 0 && text.charAt(i - 1) == ' ') {
        i--;
    }

    if (i > 0 && text.charAt(i - 1) == ' ') {
        return text;
    } else {
        if (text instanceof Spanned) {
            SpannableString sp = new SpannableString(text + " ");
            TextUtils.copySpansFrom((Spanned) text, 0, text.length(),
                    Object.class, sp, 0);
            return sp;
        } else {
            return text + " ";
        }
    }
}
}
 private String[] mStrings = {

            "Vacherin-Fribourgeois", "Valencay", "Vasterbottenost", "Venaco", "Vendomois",
            "Vieux Corse", "Vignotte", "Vulscombe", "Waimata Farmhouse Blue",
            "Washed Rind Cheese (Australian)", "Waterloo", "Weichkaese", "Wellington",
            "Wensleydale", "White Stilton", "Whitestone Farmhouse", "Wigmore", "Woodside Cabecou",
            "Xanadu", "Xynotyro", "Yarg Cornish", "Yarra Valley Pyramid", "Yorkshire Blue",
            "Zamorano", "Zanetti Grana Padano", "Zanetti Parmigiano Reggiano"};

}
我的XML：

} my xml:

   <?xml version="1.0" encoding="utf-8"?>
   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="fill_parent" android:layout_height="fill_parent"
       android:orientation="vertical"
       android:drawingCacheQuality="high">

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


<MultiAutoCompleteTextView
    android:layout_marginLeft="1dip"
    android:layout_marginTop="1dip"
    android:layout_height="wrap_content" 
    android:layout_weight="1"
    android:layout_width="fill_parent"
    android:dropDownHeight="0px" 
    android:hint="@string/To" 
    android:id="@+id/search_box"
    ></MultiAutoCompleteTextView>



<Button android:layout_width="wrap_content"
    android:layout_height="wrap_content" 
    android:text="Ok"
    android:id="@+id/ok"
    android:enabled="false"
    />  


  </LinearLayout>     
  <ListView android:id="@android:id/list" android:layout_width="fill_parent"
    android:layout_height="fill_parent" android:layout_weight="1" />

    </LinearLayout>

它给我的错误/ AndroidRuntime（423）：了java.lang.RuntimeException：无法启动活动ComponentInfo{com.test.testMultiAutoCompleteTextView/com.test.testMultiAutoCompleteTextView.testMultiAutoCompleteTextView}:显示java.lang.NullPointerException

it give me ERROR/AndroidRuntime(423): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.testMultiAutoCompleteTextView/com.test.testMultiAutoCompleteTextView.testMultiAutoCompleteTextView}: java.lang.NullPointerException

推荐答案

在onCreate方法之前调用

at onCreate method before to call

adapter = new ArrayAdapter<String>(this,
        android.R.layout.simple_list_item_1, mStrings);

您必须设置您布局

setContentView(R.layout.you_xml_file_name);

这篇关于关于MultiAutoCompleteTextView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！