我想从对话框中清除我的应用程序中的适配器。
MainActivity：
public class SearchActivity extends ListActivity {
private File currentDir;
private FileArrayAdapter adapter;
private String searchStr = "";
List<Option>dir = new ArrayList<Option>();
List<Option>fls = new ArrayList<Option>();
private String requestedStartDir;
public void readConf(){ //Methode "Konfiguration lesen"
try {
File conf=new File("/sdcard/config.xml"); //Konfigurationsdatei
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();//
DocumentBuilder db = dbf.newDocumentBuilder();//
Document doc = db.parse(conf);//XML parsen
requestedStartDir=doc.getElementsByTagName("Startordner").item(0).getTextContent();//String mit Tag "Startordner" befüllen
}
catch (Exception e) { //
e.printStackTrace();//Fehlerbehandlung (keine)
}
}
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.search_row);
String gotDir="";
readConf();
Bundle extras = getIntent().getExtras();
if(extras != null){
searchStr = extras.getString("search");
gotDir = extras.getString("Dir");
}
currentDir = new File(gotDir);
adapter = new FileArrayAdapter(this,R.layout.search_layout,fls);
fill(currentDir);
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
try {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);
Option o = adapter.getItem(position);
onFileClick(o);
}
catch (Exception e){
Log.e("TEST", Log.getStackTraceString(e));
}
}
private void onFileClick(Option o)
{
try {
File file = new File(o.getPath());
Log.d("TEST", o.getPath());
Intent opdf = new Intent(Intent.ACTION_VIEW);
opdf.setDataAndType(Uri.fromFile(file), "application/pdf");
opdf.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
startActivity(opdf);
}
catch (Exception e){
Log.e("TEST", Log.getStackTraceString(e));
}
}
public static String removeExtension(String s) {
String separator = System.getProperty("file.separator");
String filename;
// Remove the path upto the filename.
int lastSeparatorIndex = s.lastIndexOf(separator);
if (lastSeparatorIndex == -1) {
filename = s;
} else {
filename = s.substring(lastSeparatorIndex + 1);
}
// Remove the extension.
int extensionIndex = filename.lastIndexOf(".");
if (extensionIndex == -1)
return filename;
return filename.substring(0, extensionIndex);
}
private void fill(File f)
{
File[]dirs = f.listFiles();
try{
for(File ff: dirs)
{
if(ff.isDirectory()){
dir.add(new Option(ff.getName(),"File",ff.getAbsolutePath()));
File r = new File (ff.getPath());
fill2(r);
}
else{
String Name = (ff.getName().toLowerCase(Locale.GERMAN));
if (Name.contains(searchStr.toLowerCase(Locale.GERMAN))){
fls.add(new Option(removeExtension(ff.getName()),"Folder",ff.getAbsolutePath()));
}
}
}
}catch(Exception e)
{
}
Collections.sort(dir);
Collections.sort(fls);
dir.addAll(fls);
this.setListAdapter(adapter);
if (adapter.isEmpty()){
Toast toast = Toast.makeText(this, "Keine Ergebnisse gefunden", Toast.LENGTH_LONG);
toast.show();
finish();
}
this.setListAdapter(adapter);
}
private void fill2(File f)
{
File[]dirs = f.listFiles();
try{
for(File ff: dirs)
{
if(ff.isDirectory()){
dir.add(new Option(ff.getName(),"Folder",ff.getAbsolutePath()));
fill2(ff);
}
else{
String Name = (ff.getName().toLowerCase(Locale.GERMAN));
if (Name.contains(searchStr.toLowerCase(Locale.GERMAN))){
fls.add(new Option(removeExtension(ff.getName()),"Folder",ff.getAbsolutePath()));
}
}
}
}catch(Exception e)
{
}
}
public void osp (View v){
adapter.clear();
adapter.notifyDataSetChanged();
}
public void onSearchpressed(View view){
final Dialog dialog = new Dialog(this);
dialog.setContentView(R.layout.dialog);
dialog.setTitle("Suche...");
Button dialogButton1 = (Button) dialog.findViewById(R.id.dialogAbbruch);
// if button is clicked, close the custom dialog
dialogButton1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
dialog.dismiss();
}
});
Button dialogButton2 = (Button) dialog.findViewById(R.id.dialogSuche);
// if button is clicked, close the custom dialog
dialogButton2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
EditText et = (EditText) dialog.findViewById(R.id.editText1);
String searchStr = et.getText().toString();
if (et.getText().toString().equals("")){
Toast toast = Toast.makeText(getBaseContext(), "Bitte einen Suchbegriff eingeben", Toast.LENGTH_LONG);
toast.show();}
else{
osp(view);
dialog.dismiss();
}
}
});
Button dialogButton3 = (Button) dialog.findViewById(R.id.dialogSucheAll);
dialogButton3.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
EditText et = (EditText) dialog.findViewById(R.id.editText1);
String searchStr = et.getText().toString();
File sdir = new File (requestedStartDir);
currentDir = sdir;
if (et.getText().toString().equals("")){
Toast toast = Toast.makeText(getBaseContext(), "Bitte einen Suchbegriff eingeben", Toast.LENGTH_LONG);
toast.show();}
else{
osp(view);
dialog.dismiss();
}
}
});
dialog.show();
}
@Override
public void onBackPressed() {
finish();
}
}
FileArrayAdapter：
public class FileArrayAdapter extends ArrayAdapter<Option>{
private Context c;
private int id;
private List<Option>items;
public FileArrayAdapter(Context context, int textViewResourceId,
List<Option> objects) {
super(context, textViewResourceId, objects);
c = context;
id = textViewResourceId;
items = objects;
}
public Option getItem(int i)
{
return items.get(i);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater)c.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(id,parent, false);
}
final Option o = items.get(position);
if (o != null) {
TextView t2 = (TextView) v.findViewById(R.id.textView2);
if(t2!=null)
t2.setText(o.getName());
t2.setEllipsize(null);
t2.setTextSize(54);
t2.setBackgroundColor(Color.LTGRAY);
}
return v;
}
}
当我从MainActivity调用osp（view）时它会清除适配器，但是当我从对话框中调用它时它不会。我觉得很容易找到我的错，但我不能。为了让这个工作起来，我该怎么做？
答案 0 :(得分：0)
您不能只从Activity调用Dialog方法，因为它没有活动的实例。此外，除了您的活动之外，您无法从任何其他课程致电osp(view)，因为您的按钮没有View。
我会在这里实现自定义listener，或者如果你不喜欢听众LocalBroadcastManager。在您选择监听器的情况下，answer可以帮助您理解听众。