根據文件擴展名在ArrayList中設置ImageView圖像

Question

即時創建一個網站的應用程序，bayfiles.net 我有一個工作列表視圖接收JSON數據。這是工作正常的文件名和大小，現在我也有一個ImageView。我想確定它應該放在圖標架中的哪個圖標。這取決於文件名的結尾。例如以「.png」結尾的文件名應該顯示帶有「png」文字的圖標。怎麼做？

這是我的工作積極性：

public class FilesActivity extends SherlockActivity { 

    EditText editsearch; 
    fileObjectAdapter adapter; 
    String httpurl, sessionId, filetype; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.dblist); 

     ActionBar abs = getSupportActionBar(); 
     abs.setDisplayHomeAsUpEnabled(false); 
     abs.setTitle("BAYFILES"); 
     //abs.setIcon(R.drawable.abs_logo); 
     abs.setDisplayShowCustomEnabled(true); 

     LayoutParams lp = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, Gravity.RIGHT | Gravity.CENTER_VERTICAL); 
     View customNav = LayoutInflater.from(this).inflate(R.layout.actionbar, null); 
     abs.setCustomView(customNav, lp); 
     abs.setDisplayShowCustomEnabled(true); 

     abs.setDisplayOptions(abs.DISPLAY_SHOW_HOME|abs.DISPLAY_SHOW_CUSTOM); 
     abs.setDisplayShowTitleEnabled(true); 

     Crouton.makeText(this, "You have been signed in!", Style.CONFIRM).show(); 

     ImageButton btnSearch = (ImageButton) findViewById(R.id.action_search); 
     btnSearch.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       Log.d("Button Click","position"); 
      } 
     }); 

     Context context = getApplicationContext(); 
     AppPrefs appPrefs = new AppPrefs(context); 
     sessionId = appPrefs.getSessionId(); 
     newRequest("http://api.bayfiles.net/v1/account/files?session=" + sessionId); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     com.actionbarsherlock.view.MenuInflater inflater = getSupportMenuInflater(); 
     inflater.inflate(R.menu.menu, (com.actionbarsherlock.view.Menu) menu); 
     return super.onCreateOptionsMenu(menu); 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 

     switch(item.getItemId()) 
     { 
     case R.id.refresh: 
      newRequest("http://api.bayfiles.net/v1/account/files?session=" + sessionId); 
      return true; 

     case R.id.settings: 
      Intent startNewActivityOpen = new Intent(FilesActivity.this, AccountActivity.class); 
      startActivityForResult(startNewActivityOpen, 0); 
      return true; 

     case R.id.upload: 
      Crouton.makeText(this, "Coming soon!", Style.INFO).show(); 
      return true; 

     case R.id.link: 
      Crouton.makeText(this, "Add link from BayFiles", Style.INFO).show(); 
      return true; 

     case R.id.folder: 
      Crouton.makeText(this, "Not available yet!", Style.INFO).show(); 
      return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 

    @Override 
    public boolean onContextItemSelected(android.view.MenuItem item) { 
     switch(item.getItemId()){ 
     case R.id.info: 
      Crouton.makeText(this, "Coming soon!", Style.INFO).show(); 
      Log.d("log_tag", "Info"); 
      break; 
     case R.id.delete: 
      new RequestTask().execute(httpurl); 
      newRequest("http://api.bayfiles.net/v1/account/files?session=" + sessionId); 
      break; 
     } 
     return super.onContextItemSelected(item); 
    } 

    @Override 
    public void onCreateContextMenu(ContextMenu menu, View v, 
      ContextMenuInfo menuInfo) { 
     super.onCreateContextMenu(menu, v, menuInfo); 
     MenuInflater inflate = getMenuInflater(); 
     inflate.inflate(R.menu.context_menu, menu); 
    } 

    public static String readableFileSize(long size) { 
     if(size <= 0) return "0"; 
     final String[] units = new String[] { "B", "KB", "MB", "GB", "TB" }; 
     int digitGroups = (int) (Math.log10(size)/Math.log10(1024)); 
     return new DecimalFormat("#,##0.#").format(size/Math.pow(1024, digitGroups)) + " " + units[digitGroups]; 
    } 

    public void newRequest(String url){ 
     String response = null; 
     DefaultHttpClient httpClient = new DefaultHttpClient(); 
     ResponseHandler <String> resonseHandler = new BasicResponseHandler(); 
     HttpPost postMethod = new HttpPost(url); 

     try { 
      JSONObject json = new JSONObject(); 

       postMethod.setEntity(new ByteArrayEntity(json.toString().getBytes("UTF8"))); 
       postMethod.setHeader("Content-Type", "application/json"); 
       response = httpClient.execute(postMethod,resonseHandler); 
       JSONObject request = new JSONObject(response); 

       ArrayList<fileObject> objectList = new ArrayList<fileObject>(); 

       for (Iterator<?> keyIterator = request.keys(); keyIterator.hasNext();) { 
        String key = (String) keyIterator.next(); 
        JSONObject object = request.optJSONObject(key); 

        if (object != null) { 
         long l = Long.parseLong(object.getString("size")); 
         String size = readableFileSize(l); 
         String[] filetype = object.getString("filename").split("\\."); 
         Log.d("log_tag", filetype[1]); 

         fileObject obj = new fileObject(); 

         obj.setFileId(key); 
         obj.setFileName(object.getString("filename")); 
         obj.setSize(size); 
         obj.setInfoToken(object.getString("infoToken")); 
         obj.setDeleteToken(object.getString("deleteToken")); 
         obj.setSha1(object.getString("sha1")); 
         obj.setFileType(filetype[1]); 
         objectList.add(obj); 

        } 
       }   
       final ListView lv1 = (ListView) findViewById(R.id.listobjects); 
       lv1.setAdapter(new fileObjectAdapter(this, objectList)); 
       lv1.setOnItemClickListener(new OnItemClickListener() { 
       @Override 
       public void onItemClick(AdapterView<?> a, View v, int position, long id) { 
        Object o = lv1.getItemAtPosition(position); 
        fileObject fullObject = (fileObject) o; 
        Log.d("log_tag", "Filename: " + fullObject.getFileName()); 
        httpurl = "http://bayfiles.net/file/" + fullObject.getFileId() + "/" + fullObject.getInfoToken() + "/" + fullObject.getFileName(); 
       } 
       }); 

       lv1.setOnItemLongClickListener(new OnItemLongClickListener() { 

        public boolean onItemLongClick(AdapterView<?> arg0, View arg1, int position, long id) { 
         registerForContextMenu(lv1); 
         openContextMenu(lv1); 

         Object o = lv1.getItemAtPosition(position); 
         fileObject fullObject = (fileObject) o; 
         httpurl = "http://api.bayfiles.net/v1/file/delete/" + fullObject.getFileId() + "/" + fullObject.getDeleteToken(); 
         return true; 
        } 
       }); 
     } 
     catch(Exception e) 
     {  
      e.printStackTrace(); 
      Log.d("log_tag", "Error: " + e.toString()); 

     } 
    } 
} 

我的文件對象：

package com.spxc.bayfiles.adapter; 

    public class fileObject { 

     private String fileName; 
     private String size; 
     private String infoToken; 
     private String deleteToken; 
     private String sha1; 
     private String fileId; 
     private String fileType; 

     public String getFileName() { 
      return fileName; 
     } 

     public void setFileName(String fileName) { 
      this.fileName = fileName; 
     } 

     public String getSize() { 
      return size; 
     } 

     public void setSize(String size) { 
      this.size = size; 
     } 

     public String getInfoToken() { 
      return infoToken; 
     } 

     public void setInfoToken(String infoToken) { 
      this.infoToken = infoToken; 
     } 

     public String getDeleteToken() { 
      return deleteToken; 
     } 

     public void setDeleteToken(String deleteToken) { 
      this.deleteToken = deleteToken; 
     } 

     public String getSha1() { 
      return sha1; 
     } 

     public void setSha1(String sha1) { 
      this.sha1 = sha1; 
     } 

     public String getFileId() { 
      return fileId; 
     } 

     public void setFileId(String fileId) { 
      this.fileId = fileId; 
     } 
     public String getFileType(){ 
      return fileType; 
     } 
     public void setFileType(String fileType){ 
      this.fileType = fileType; 
     } 
    } 

而且我adaper：

public class fileObjectAdapter extends BaseAdapter { 
    private static ArrayList<fileObject> searchArrayList; 

    private LayoutInflater mInflater; 

    public fileObjectAdapter(Context context, ArrayList<fileObject> results) { 
     searchArrayList = results; 
     mInflater = LayoutInflater.from(context); 
    } 

    public int getCount() { 
     return searchArrayList.size(); 
    } 

    public Object getItem(int position) { 
     return searchArrayList.get(position); 
    } 

    public long getItemId(int position) { 
     return position; 
    } 

    public View getView(int position, View convertView, ViewGroup parent) { 
     ViewHolder holder; 
     if (convertView == null) { 
     convertView = mInflater.inflate(R.layout.dbitems, null); 
     holder = new ViewHolder(); 
     holder.txtFileName = (TextView) convertView.findViewById(R.id.size); 
     holder.txtSize = (TextView) convertView.findViewById(R.id.filename); 
     holder.imgIcon = (ImageView) convertView.findViewById(R.id.typeimg); 

     convertView.setTag(holder); 
     } else { 
     holder = (ViewHolder) convertView.getTag(); 
     } 

     holder.txtFileName.setText(searchArrayList.get(position).getFileName()); 
     holder.txtSize.setText(searchArrayList.get(position).getSize()); 
     //holder.imgIcon.setImageResource(SET DRAWABLE ACCORDING TO ENDING); 

     return convertView; 
    } 

    static class ViewHolder { 
     TextView txtFileName; 
     TextView txtSize; 
     ImageView imgIcon; 
    } 
    public void filter(String charText) { 
      charText = charText.toLowerCase(Locale.getDefault()); 
      searchArrayList.clear(); 
      if (charText.length() == 0) { 
       searchArrayList.addAll(searchArrayList); 
      } 
      else 
      { 
       for (fileObject wp : searchArrayList) 
       { 
        if (wp.getFileName().toLowerCase(Locale.getDefault()).contains(charText)) 
        { 
         searchArrayList.add(wp); 
        } 
       } 
      } 
      notifyDataSetChanged(); 
     } 
    } 

正如你所看到的，我得到了完整的文件名和分裂它分成兩塊。文件名和擴展名。然後我會做一個if語句來檢查它是哪個文件擴展名。然後我希望它根據文件擴展名更改列表項中的圖標。如何才能做到這一點？

任何幫助非常感謝！

Answer 1

如果我誤解了你的問題，我很抱歉。我經歷了幾次以確定，但是我的解決方案相對簡單，並且由於您似乎知道自己在代碼中做了什麼，我很驚訝您現在還沒有得到它。再次，如果我誤解了，我很抱歉。

您需要在ImageView上設置可繪製資源。這非常簡單，但第一部分是如果你希望在各種屏幕分辨率下看起來很好，你需要在你的/ res文件夾中有幾個不同的版本。您基本上需要將圖像縮放到放置在相應文件夾中的不同分辨率。 MDPI = 1.0X，HDPI = 1.5X，XHDPI = 2.0X。

因此可以說你有一張你想要顯示的.exe文件擴展名的圖片。您將以MDPI的基本72分辨率製作文件，然後爲HDPI和XHDPI創建縮放版本。假設您將圖片文件命名爲exe_picture.png。你會在每個文件夾中放置名爲exe_picture的相應文件。然後，你可以參考，並放置在ImageView的圖像編程中的適配器getView功能等（請注意下面的代碼是未經測試）：

holder.txtFileName.setText(searchArrayList.get(position).getFileName()); 
holder.txtSize.setText(searchArrayList.get(position).getSize()); 

String fileType = searchArrayList.get(position).getFileType(); 
int imageResID = 0; 
if (fileType.equals("exe")) { 
    imageResID = R.drawable.exe_picture; 
} 

holder.imgIcon.setImageResource(imageResID); 

從那裏當然，你可以簡單地連鎖else if語句可用於所有的您想要支持的文件類型。

希望這會有所幫助！祝你好運。