Android - 如何使一個活動加載更快？

Question

我目前正在研究一款短信應用程序，它與股票短信應用程序非常相似。

但問題是我的應用程序加載比股票（內置）應用程序慢得多。

這裏是我的應用程序的代碼： -

public class ThreadData extends ListActivity 
{ 
private static final Uri SMS_URI = Uri.parse("content://sms"); 
ArrayList<String> bodies = new ArrayList<String>(); 
MySMSAdapter adapter; 
String name; 

public void onCreate(Bundle bundle) 
{ 
    super.onCreate(bundle); 
    setContentView(R.layout.threadlist); 
    Bundle extras = getIntent().getExtras(); 
    if(extras != null) 
    { 
     name = extras.getString("address"); 
    } 
    Cursor cursor = getContentResolver().query(SMS_URI, null, null, null, "date ASC"); 
    startManagingCursor(cursor); 
    while (cursor.moveToNext()) 
    { 
     String Id = cursor.getString(cursor.getColumnIndex("_id")); 
     String address = cursor.getString(cursor.getColumnIndex("address")); 
     String body = cursor.getString(cursor.getColumnIndexOrThrow("body")); 
     String personName = getPersonName(Id, address); 
     if(personName.equals(name)) 
     { 
      bodies.add(body); 
     } 
    } 
    //adapter = new MySMSAdapter(this, bodies); 
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.sms_inbox, R.id.row, bodies); 
    ListView listView = getListView(); 
    listView.setAdapter(adapter); 
} 
public String getPersonName(String id, String address) 
{ 
     if(id==null) 
     { 
      if(address != null) 
      { 
       return PhoneNumberUtils.formatNumber(address); 
      } 
      else 
      { 
       return null; 
      } 
     } 

     Cursor c = this.getContentResolver().query(Uri.withAppendedPath(ContactsContract.PhoneLookup.CONTENT_FILTER_URI, address), 
        new String[] { ContactsContract.PhoneLookup.DISPLAY_NAME }, null, null, null); 

     if(c != null) 
     { 
      try 
      { 
       if(c.getCount() > 0) 
       { 
        c.moveToFirst(); 
        return c.getString(0); 
       } 
      } 
      finally 
      { 
       c.close(); 
      } 
     } 
     if(address != null) 
     { 
      return PhoneNumberUtils.formatNumber(address); 
     } 
     return null; 
} 

} 

我的自定義適配器： -

public class MySMSAdapter extends BaseAdapter 
{ 
private Activity activity; 
private ArrayList<String> data; 
LayoutInflater inflater; 

public MySMSAdapter(Activity a, ArrayList<String> arrayList) 
{ 
    activity = a; 
    data = arrayList; 
    inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
} 

public int getCount() 
{ 
    return data.size(); //To change body of implemented methods use File | Settings | File Templates. 
} 

public Object getItem(int i) 
{ 
    return data.get(i); //To change body of implemented methods use File | Settings | File Templates. 
} 

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

public static class ViewHolder 
{ 
    public TextView textView; 
} 

public View getView(final int i, View view, ViewGroup viewGroup) 
{ 
    View row = view; 
    final ViewHolder holder; 
    if(view==null) 
    { 
     row = inflater.inflate(R.layout.sms_inbox, viewGroup, false); 
     holder = new ViewHolder(); 
     holder.textView = (TextView)row.findViewById(R.id.row); 
     row.setTag(holder); 
    } 
    else 
    { 
     holder = (ViewHolder)row.getTag(); 
    } 

    holder.textView.setText(data.get(i)); 
    return row; 
} 
} 

在我的課堂我試圖加載與這兩個選項（自定義適配器以及ArrayAdapter）名單，但在這兩種情況下我的應用程序加載非常緩慢。如何加載速度更快？我可能更喜歡我的自定義適配器的解決方案，因爲將來我可能需要添加一些東西來添加我的佈局，如照片和其他東西。

謝謝。請幫忙！！

Answer 1

您可以使用http://developer.android.com/guide/developing/tools/traceview.html事件探查器本地化性能問題。我猜測問題是你正在做磁盤操作（Cursor cursor = getContentResolver（）。query（...））同步。嘗試使用AssyncTask來完成這個assync，例如