Question

我在操作栏中有一个下拉AutoCompleteTextView。

我正在尝试从AutoCompleteTextView获取文本并将其存储到字符串中。

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.location2);//Location2 is my layout

    android.support.v7.app.ActionBar actionBar = getSupportActionBar();
    actionBar.setDisplayHomeAsUpEnabled(false);
    actionBar.setDisplayShowTitleEnabled(false);
    actionBar.setDisplayShowCustomEnabled(true);
    LayoutInflater inflater = (LayoutInflater) this
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    View view = inflater.inflate(R.layout.location, null);//location is my custom action bar
    actionBar.setCustomView(view);
    Global global = new Global();
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_spinner_dropdown_item, global.getUniversities());
    AutoCompleteTextView textView = (AutoCompleteTextView) view
            .findViewById(R.id.searchLocation);
    textView.setAdapter(adapter);
 ...
}

 public void changeLocation(View view){

    View v = View.inflate(this, R.layout.location, null);
    AutoCompleteTextView searchLocation = (AutoCompleteTextView)
            v.findViewById(R.id.searchLocation);
    String searchLocationText = searchLocation.getText().toString();
    Toast.makeText(this, searchLocationText,
            Toast.LENGTH_LONG).show();
    ...
 }

<AutoCompleteTextView
    android:id="@+id/searchLocation"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:drawableLeft="@drawable/search"
    android:paddingTop="15dp"
    android:imeOptions="actionSearch"
    android:inputType="textAutoComplete|textAutoCorrect"
    android:textColor="#FFFFFF" >

    <requestFocus />
</AutoCompleteTextView>

自动完成功能就像一个魅力......但是toast显示String searchLocationText是空的......

操作栏中的autocompletetextview有什么不正确的地方？

如何将文本转换为字符串？

编辑： - 更多详情

我可以输入AutoCompleteTextView，它会自动填充下拉列表，一切正常。但我尝试将该信息转换为字符串，字符串为空......

错误：

java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.AutoCompleteTextView.getText()' on a null object reference

错误指的是行：

String searchLocationText = searchLocation.getText().toString();

Answer 1

您需要从已附加到布局的视图中获取文本。但是你在这里夸大了一个新观点。

public void changeLocation(View view) {
    View v = View.inflate(this, R.layout.location, null);
    AutoCompleteTextView searchLocation = (AutoCompleteTextView)
            v.findViewById(R.id.searchLocation);
    String searchLocationText = searchLocation.getText().toString();
    Toast.makeText(this, searchLocationText,
            Toast.LENGTH_LONG).show();
    [...]
}

而是在onCreate()

中查找活动视图

public void changeLocation(View view) {
    ActionBar actionBar = getSupportActionBar();
    view = actionBar.getCustomView();
    AutoCompleteTextView searchLocation = (AutoCompleteTextView) view
            .findViewById(R.id.searchLocation);
    String searchLocationText = searchLocation.getText().toString();
    Toast.makeText(this, searchLocationText,
            Toast.LENGTH_LONG).show();
    [...]
}

AutoCompleteTextView.getText（）。toString（）为null

1 个答案: