在Android上單擊圖像時，我的左右刷卡不工作？

Question

public class Starter_info extends Activity implements OnClickListener, 
    OnRatingBarChangeListener { 
private GestureDetector gestureDetector; 
ImageView iv; 
ImageView ib_dow, ib_wal; 
ImageView btn_rate; 
ProgressBar pb; 
Dialog dialog; 
int downloadedSize = 0; 
int totalSize = 0; 
TextView cur_val; 
Dialog rankDialog; 
RatingBar ratingBar,pre_rating; 
float cus_rating; 
    ProgressDialog progDailog; 
    private static final String TAG_CONTACTS = "Demo"; 
private static final String TAG_ID = "id"; 
private static final String TAG_TITLE = "title"; 
private static final String TAG_RATING = "Rating"; 
private static final String TAG_CATEGORY = "Category"; 
private static final String TAG_IMAGE = "Images"; 
private static final String TAG_DOWNLOAD = "Downloads"; 
private static int poster_position; 
private Bundle poster_description_bundle; 
private FetchWallPaperDescriptionTask fetchWallPaperDescriptionTask; 
private ImageLoader imgLoader; 
private DisplayImageOptions options; 
@SuppressLint("NewApi") 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.starter_info); 
    Log.v("starter Info Heap","Max Mem in MB:"+(Runtime.getRuntime().maxMemory()/1024/1024)); 
    ActionBar actionBar = getActionBar(); 
    actionBar.setDisplayHomeAsUpEnabled(true); 
    gestureDetector = new GestureDetector(new SwipeGestureDetector()); 
    imgLoader = ImageLoader.getInstance(); 
    options= new DisplayImageOptions.Builder() 
    .showImageOnLoading(R.drawable.empty_photo) 
    .showImageForEmptyUri(R.drawable.empty_photo) 
    .showImageOnFail(R.drawable.empty_photo) 
    .cacheInMemory(true) 
    .cacheOnDisc(true) 
    .displayer(new RoundedBitmapDisplayer(20)) 
    .build(); 
    ImageView rankBtn = (ImageView) findViewById(R.id.btn_starter_info_rate); 
    ib_dow = (ImageView) findViewById(R.id.ib_starter_info_down); 
    ib_wal = (ImageView) findViewById(R.id.ib_starter_info_Wall); 
    pre_rating=(RatingBar) findViewById(R.id.rb_starter_info_pre_rating); 
    iv = (ImageView) findViewById(R.id.iv_starter_info); 
rankBtn.setOnClickListener(new View.OnClickListener() { 
     public void onClick(View v) { 
      rankDialog = new Dialog(Starter_info.this, 
        R.style.FullHeightDialog); 
      rankDialog.setContentView(R.layout.rating_bar); 
      rankDialog.setCancelable(true); 
      ratingBar = (RatingBar) rankDialog 
        .findViewById(R.id.dialog_ratingbar); 
      float userRankValue = 0; 
    ratingBar 
        .setOnRatingBarChangeListener(new OnRatingBarChangeListener() { 
         @Override 
         public void onRatingChanged(RatingBar ratingBar, 
           float rating, boolean fromUser) { 
          // TODO Auto-generated method stub 
          cus_rating = rating; 

         } 
        }); 
    Button updateButton = (Button) rankDialog 
        .findViewById(R.id.rank_dialog_button); 
      updateButton.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        Toast.makeText(Starter_info.this, 
          "Rating is" + cus_rating, Toast.LENGTH_LONG) 
          .show(); 

        HttpClient httpclient = new DefaultHttpClient(); 
        HttpPost httppost = new HttpPost(
          "http://vaibhavtech.com/work/android/rating.php"); 
    try { 
    List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(
           1); 
         nameValuePairs.add(new BasicNameValuePair("id", 
           (String) MainActivity.WALL_PAPER_RESPONSE.get(poster_position).get("id"))); 
         nameValuePairs.add(new BasicNameValuePair("rating", 
           "" + cus_rating)); 
         httppost.setEntity(new UrlEncodedFormEntity(
           nameValuePairs)); 
         ResponseHandler<String> responseHandler = new BasicResponseHandler(); 
         String response = httpclient.execute(httppost, 
           responseHandler); 
    String reverseString = response; 
         Log.i("response", reverseString); 

        } catch (ClientProtocolException e) { 
         Log.i("CPE response ", e.toString()); 

        } catch (IOException e) { 
         Log.i("IOException response ", e.toString()); 
       } 
     rankDialog.dismiss(); 
       } 
      }); 
      rankDialog.show(); 
     } 
    }); 

    if(getIntent().getExtras()!=null) 
     poster_position= getIntent().getExtras().getInt("clicked_position"); 

    ib_dow.setOnClickListener(this); 
    ib_wal.setOnClickListener(this); 
    int loader = R.drawable.load; 
    fetchWallPaperDescriptionTask=new FetchWallPaperDescriptionTask(); 
    fetchWallPaperDescriptionTask.execute(); 
} 
public boolean onCreateOptionsMenu(Menu menu) { 
    getMenuInflater().inflate(R.menu.main, menu); 
    return true; 
} 
    @Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // TODO Auto-generated method stub 
    switch(item.getItemId()) 
    { 
    case android.R.id.home: 
     onBackPressed(); 
     return true; 
     case R.id.home: 
      Intent intent = new Intent(this, Category.class); 
      intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
      startActivity(intent); 
      return true; 
    } 
    return super.onOptionsItemSelected(item); 
} 

@Override 
public void onClick(View v) { 
    switch (v.getId()) { 
    case R.id.ib_starter_info_down: 

      //   showProgress(img_url); 
     showProgress((String)MainActivity.WALL_PAPER_RESPONSE.get(poster_position).get("flag_path")); 

     new Thread(new Runnable() { 
      public void run() { 
       downloadFile(); 
      } 
     }).start(); 
     break; 
    case R.id.ib_starter_info_Wall: 
      //   showProgress(img_url); 
     showProgress((String)MainActivity.WALL_PAPER_RESPONSE.get(poster_position).get("flag_path")); 

     new Thread(new Runnable() { 
      public void run() { 
       downloadFile_Wall(); 
       WallpaperManager myWallpaperManager = WallpaperManager 
         .getInstance(getApplicationContext()); 
       Bitmap o = BitmapFactory.decodeFile("/sdcard/." + (String)MainActivity.WALL_PAPER_RESPONSE.get(poster_position).get("title")); 
       try { 
        myWallpaperManager.setBitmap(o); 
       } catch (IOException e) { 
        e.printStackTrace(); 
       } 
      } 
     }).start(); 
     break; 
    case R.id.btn_starter_info_rate: 
break; 
    } 
} 
    @Override 
public void onRatingChanged(RatingBar ratingBar, float rating, 
     boolean fromUser) { 
Toast.makeText(this, "Your Rating is" + rating, Toast.LENGTH_LONG) 
      .show(); 
} 
    void downloadFile() { 

    try { 
     URL url = new URL((String)MainActivity.WALL_PAPER_RESPONSE.get(poster_position).get("flag_path")); 
     HttpURLConnection urlConnection = (HttpURLConnection) url 
       .openConnection(); 
     urlConnection.setRequestMethod("GET"); 
     urlConnection.setDoOutput(true); 
     urlConnection.connect(); 
    File SDCardRoot = new File(Environment.getExternalStorageDirectory().toString()+"/wallpaperapp/"); 
     SDCardRoot.mkdir(); 
File file = new File(SDCardRoot, (String)MainActivity.WALL_PAPER_RESPONSE.get(poster_position).get("title")+".jpg"); 
    FileOutputStream fileOutput = new FileOutputStream(file); 
    InputStream inputStream = urlConnection.getInputStream(); 
    totalSize = urlConnection.getContentLength(); 
    runOnUiThread(new Runnable() { 
      public void run() { 
       pb.setMax(totalSize); 
      } 
     }); 
     byte[] buffer = new byte[1024]; 
     int bufferLength = 0; 
     while ((bufferLength = inputStream.read(buffer)) > 0) { 
      fileOutput.write(buffer, 0, bufferLength); 
      downloadedSize += bufferLength; 
      runOnUiThread(new Runnable() { 
       public void run() { 
        pb.setProgress(downloadedSize); 
        float per = ((float) downloadedSize/totalSize) * 100; 
        cur_val.setText("Downloaded " + downloadedSize 
          + "KB/" + totalSize + "KB (" + (int) per 
          + "%)"); 
       } 
      }); 
     } 
     fileOutput.close(); 
     runOnUiThread(new Runnable() { 
      public void run() { 
       HttpClient httpclient = new DefaultHttpClient(); 
       HttpPost httppost = new HttpPost(
         "http://vaibhavtech.com/work/android/downloads.php"); 

       try { 
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(
          1); 
       nameValuePairs 
        .add(new BasicNameValuePair("id", (String) MainActivity.WALL_PAPER_RESPONSE.get(poster_position).get("id"))); 

        httppost.setEntity(new UrlEncodedFormEntity(
          nameValuePairs)); 
     ResponseHandler<String> responseHandler = new BasicResponseHandler(); 
        String response = httpclient.execute(httppost, 
          responseHandler); 
     String reverseString = response; 
        Log.i("response", reverseString); 
     } catch (ClientProtocolException e) { 
        Log.i("CPE response ", e.toString()); 
       } catch (IOException e) { 
        Log.i("IOException response ", e.toString()); 
       } 
       dialog.dismiss(); 
       Toast.makeText(Starter_info.this, "SuccessFully Download..", 
         Toast.LENGTH_LONG).show(); 
      } 
     }); 

    } catch (final MalformedURLException e) { 
     showError("Error : MalformedURLException " + e); 
     e.printStackTrace(); 
    } catch (final IOException e) { 
     showError("Error : IOException " + e); 
     e.printStackTrace(); 
    } catch (final Exception e) { 
     showError("Error : Please check your internet connection " + e); 
    } 
} 

// For WallPaper Set Clcik Here............. 
void downloadFile_Wall() { 
    try { 
     //   URL url = new URL(img_url); 
     URL url = new URL((String)MainActivity.WALL_PAPER_RESPONSE.get(poster_position).get("flag_path")); 
     HttpURLConnection urlConnection = (HttpURLConnection) url 
       .openConnection(); 
     urlConnection.setRequestMethod("GET"); 
     urlConnection.setDoOutput(true); 
     // connect 
     urlConnection.connect(); 
     // set the path where we want to save the file 
    //   File SDCardRoot = Environment.getExternalStorageDirectory(); 
     File SDCardRoot = new File(Environment.getExternalStorageDirectory().toString()+"/wallpaperapp/"); 
     SDCardRoot.mkdir(); 
     // create a new file, to save the downloaded file 
//   File file = new File(SDCardRoot, "." + img_name); 

     File file = new File(SDCardRoot, (String)MainActivity.WALL_PAPER_RESPONSE.get(poster_position).get("title")+".jpg"); 
     FileOutputStream fileOutput = new FileOutputStream(file); 
     // Stream used for reading the data from the internet 
     InputStream inputStream = urlConnection.getInputStream(); 
     // this is the total size of the file which we are downloading 
     totalSize = urlConnection.getContentLength(); 

     runOnUiThread(new Runnable() { 
      public void run() { 
       pb.setMax(totalSize); 
      } 
     }); 
     // create a buffer... 
     byte[] buffer = new byte[1024]; 
     int bufferLength = 0; 
     while ((bufferLength = inputStream.read(buffer)) > 0) { 
      fileOutput.write(buffer, 0, bufferLength); 
      downloadedSize += bufferLength; 
      // update the progressbar // 
      runOnUiThread(new Runnable() { 
       public void run() { 
        pb.setProgress(downloadedSize); 
        float per = ((float) downloadedSize/totalSize) * 100; 
        cur_val.setText("Please Wait..."); 
       } 
      }); 
     } 
     // close the output stream when complete // 
     fileOutput.close(); 
     runOnUiThread(new Runnable() { 
      public void run() { 
       // pb.dismiss(); // if you want close it.. 
       Toast.makeText(Starter_info.this, "Changes Apply SuccessFully..", 
         Toast.LENGTH_LONG).show(); 
       dialog.dismiss(); 
      } 
     }); 

    } catch (final MalformedURLException e) { 
     showError("Error : MalformedURLException " + e); 
     e.printStackTrace(); 
    } catch (final IOException e) { 
     showError("Error : IOException " + e); 
     e.printStackTrace(); 
    } catch (final Exception e) { 
     showError("Error : Please check your internet connection " + e); 
     e.printStackTrace(); 
    } 
} 

void showError(final String err) { 
    runOnUiThread(new Runnable() { 
     public void run() { 
      Toast.makeText(Starter_info.this, err, Toast.LENGTH_LONG) 
        .show(); 

     } 
    }); 
    } 

void showProgress(String file_path) { 
    dialog = new Dialog(Starter_info.this); 
    dialog.requestWindowFeature(Window.FEATURE_NO_TITLE); 
    dialog.setContentView(R.layout.myprogressdialog); 
    dialog.setTitle("Download Progress"); 

    TextView text = (TextView) dialog.findViewById(R.id.tv1); 
    text.setText("Downloading file from ... " + file_path); 
    cur_val = (TextView) dialog.findViewById(R.id.cur_pg_tv); 
    cur_val.setText("Starting download..."); 
    dialog.show(); 

    pb = (ProgressBar) dialog.findViewById(R.id.progress_bar); 
    pb.setProgress(0); 
    pb.setProgressDrawable(getResources().getDrawable(
      R.drawable.green_progress)); 

    Toast.makeText(getApplicationContext(), "Please Wait..Process Run In BackGround", Toast.LENGTH_LONG).show(); 
} 

@Override 
public boolean onTouchEvent(MotionEvent event) { 
    if (gestureDetector.onTouchEvent(event)) { 
     return true; 
    } 
    return super.onTouchEvent(event); 
} 

private void onLeftSwipe() { 
    Log.i("Swipe", "Left Swipe"); 
Toast.makeText(Starter_info.this, "Left Swipe", Toast.LENGTH_LONG).show(); 
     startActivity(new Intent(Starter_info.this, Starter_info.class)); 
    JSONArray contacts = null; 
Swipe_parser jParser = new Swipe_parser(); 

    // getting JSON string from URL 
    //  String url="http://vaibhavtech.com/work/android/wallpaper_data.php?next="+img_id; 
    String url="http://vaibhavtech.com/work/android/wallpaper_data.php?next="+(String) MainActivity.WALL_PAPER_RESPONSE.get(poster_position).get("id"); 
    JSONObject json = jParser.getJSONFromUrl(url); 

    try { 
     // Getting Array of Contacts 
     contacts = json.getJSONArray(TAG_CONTACTS); 

     // looping through All Contacts 
     for(int i = 0; i < contacts.length(); i++){ 
      JSONObject c = contacts.getJSONObject(i); 

      // Storing each json item in variable 
      String id = c.getString(TAG_ID); 
      String title = c.getString(TAG_TITLE); 
      String rating = c.getString(TAG_RATING); 
      String image = c.getString(TAG_IMAGE); 
      String category = c.getString(TAG_CATEGORY); 
      String download=c.getString(TAG_DOWNLOAD); 
      Log.i("id", id); 
      Log.i("titleq", title); 
      Log.i("rating", rating); 
      Log.i("image",image); 
      Log.i("catet", category); 
      Log.i("download", download); 

     } 
     startActivity(new Intent(Starter_info.this,Starter_info.class)); 
     finish(); 
    } catch (JSONException e) { 
     e.printStackTrace(); 
    } 

} 

private void onRightSwipe() { 
    // Do something 

    Log.i("Swipe", "Right Swipe"); 
    Toast.makeText(Starter_info.this, "Right Swipe", Toast.LENGTH_LONG) 
      .show(); 
    JSONArray contacts = null; 

    Swipe_parser jParser = new Swipe_parser(); 
String url="http://vaibhavtech.com/work/android/wallpaper_data.php?next="+(String) MainActivity.WALL_PAPER_RESPONSE.get(poster_position).get("id"); 
    JSONObject json = jParser.getJSONFromUrl(url); 

    try { 
     // Getting Array of Contacts 
     contacts = json.getJSONArray(TAG_CONTACTS); 

     // looping through All Contacts 
     for(int i = 0; i < contacts.length(); i++){ 
      JSONObject c = contacts.getJSONObject(i); 

      // Storing each json item in variable 
      String id = c.getString(TAG_ID); 
      String title = c.getString(TAG_TITLE); 
      String rating = c.getString(TAG_RATING); 
      String image = c.getString(TAG_IMAGE); 
      String category = c.getString(TAG_CATEGORY); 
      String download=c.getString(TAG_DOWNLOAD); 
      Log.i("id", id); 
      Log.i("titleq", title); 
      Log.i("rating", rating); 
      Log.i("image",image); 
      Log.i("catet", category); 
      Log.i("download", download); 
      } 
     startActivity(new Intent(Starter_info.this,Starter_info.class)); 
     finish(); 
    } catch (JSONException e) { 
     e.printStackTrace(); 
    } 


} 
private class SwipeGestureDetector extends SimpleOnGestureListener { 
    // Swipe properties, you can change it to make the swipe 
    // longer or shorter and speed 
    private static final int SWIPE_MIN_DISTANCE = 120; 
    private static final int SWIPE_MAX_OFF_PATH = 200; 
    private static final int SWIPE_THRESHOLD_VELOCITY = 200; 

    @Override 
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, 
      float velocityY) { 
     try { 
      float diffAbs = Math.abs(e1.getY() - e2.getY()); 
      float diff = e1.getX() - e2.getX(); 

      if (diffAbs > SWIPE_MAX_OFF_PATH) 
       return false; 
      // Left swipe 
      if (diff > SWIPE_MIN_DISTANCE 
        && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) { 
       Starter_info.this.onLeftSwipe(); 

       // Right swipe 
      } else if (-diff > SWIPE_MIN_DISTANCE 
        && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) { 
       Starter_info.this.onRightSwipe(); 
      } 
     } catch (Exception e) { 
      Log.e("YourActivity", "Error on gestures"); 
     } 
     return false; 
    } 
    } 

class FetchWallPaperDescriptionTask extends AsyncTask<String, String, Boolean> 
{ 
    private ProgressDialog progressDialog; 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     progressDialog=ProgressDialog.show(Starter_info.this, "", "Loading..."); 
    } 

    @Override 
    protected Boolean doInBackground(String... params) { 
     JSONArray contacts = null; 
     Swipe_parser jParser = new Swipe_parser(); 
     // getting JSON string from URL 
     String url="http://vaibhavtech.com/work/android/wallpaper_data.php?pre="+MainActivity.WALL_PAPER_RESPONSE.get(poster_position).get("id"); 
     Log.v("Description URL", url); 
     url="http://vaibhavtech.com/work/android/wallpaper_data.php?pre=4"; 
     Log.v("Description URL", url); 
     JSONObject json = jParser.getJSONFromUrl(url); 

     try { 
      // Getting Array of Contacts 
      contacts = json.getJSONArray(TAG_CONTACTS); 
      poster_description_bundle=new Bundle(); 
      // looping through All Contacts 
      for(int i = 0; i < contacts.length(); i++){ 
       JSONObject c = contacts.getJSONObject(i); 

       // Storing each json item in variable 
       String id = c.getString(TAG_ID); 
       String title = c.getString(TAG_TITLE); 
       String rating = c.getString(TAG_RATING); 
       String image = c.getString(TAG_IMAGE); 
       String category = c.getString(TAG_CATEGORY); 
       String download=c.getString(TAG_DOWNLOAD); 
       Log.i("id", id); 
       Log.i("titleq", title); 
       Log.i("rating", rating); 
       Log.i("image",image); 
       Log.i("catet", category); 
       Log.i("download", download); 

       poster_description_bundle.putString(TAG_ID, c.getString(TAG_ID)); 
       poster_description_bundle.putString(TAG_TITLE, c.getString(TAG_TITLE)); 
       poster_description_bundle.putString(TAG_RATING, c.getString(TAG_RATING)); 
       poster_description_bundle.putString(TAG_IMAGE, c.getString(TAG_IMAGE)); 
       poster_description_bundle.putString(TAG_CATEGORY, c.getString(TAG_CATEGORY)); 
       poster_description_bundle.putString(TAG_DOWNLOAD, c.getString(TAG_DOWNLOAD)); 
        } 
      return true; 
     } catch (JSONException e) { 
      e.printStackTrace(); 
      return false; 
     } 
     } 

    @Override 
    protected void onPostExecute(Boolean result) { 
     super.onPostExecute(result); 

     if(progressDialog!=null) 
      progressDialog.dismiss(); 

     if(result) 
     { 
      imgLoader.displayImage((String) MainActivity.WALL_PAPER_RESPONSE.get(poster_position).get("flag_path"), iv,options); 
      Log.v("Image Rating ", poster_description_bundle.getString(TAG_RATING)); 
      pre_rating.setRating(Float.parseFloat(poster_description_bundle.getString(TAG_RATING))); 
      setMemorySpaceUI(); 
     } 
    } 
} 

private void setMemorySpaceUI() 
{ 
    final TextView occupiedSpaceText = (TextView)findViewById(R.id.occupiedSpace); 
    final TextView freeSpaceText = (TextView)findViewById(R.id.freeSpace); 
    final TextView downloadCount = (TextView)findViewById(R.id.txt_total_files); 
    final ProgressBar progressIndicator = (ProgressBar)findViewById(R.id.indicator); 
    final float totalSpace = DeviceMemory.getInternalStorageSpace(); 
    final float occupiedSpace = DeviceMemory.getInternalUsedSpace(); 
    final float freeSpace = DeviceMemory.getInternalFreeSpace(); 
    final DecimalFormat outputFormat = new DecimalFormat("#.##"); 

    if (null != occupiedSpaceText) { 
     occupiedSpaceText.setText(outputFormat.format(occupiedSpace) + " MB"); 
    } 

    if (null != freeSpaceText) { 
     freeSpaceText.setText(outputFormat.format(freeSpace) + " MB"); 
    } 

    if (null != progressIndicator) { 
     progressIndicator.setMax((int) totalSpace); 
     progressIndicator.setProgress((int)occupiedSpace); 
    } 
    downloadCount.setText("Downloads :"+DeviceMemory.getDownloadCount()); 
} 

public static class DeviceMemory { 

     public static float getInternalStorageSpace() { 
    //    StatFs statFs = new StatFs(Environment.getDataDirectory().getAbsolutePath()); 
      StatFs statFs = new StatFs(Environment.getExternalStorageDirectory().getAbsolutePath()); 
      //StatFs statFs = new StatFs("/data"); 
      float total = ((float)statFs.getBlockCount() * statFs.getBlockSize())/1048576; 
      return total; 
     } 

     public static float getInternalFreeSpace() { 
    //    StatFs statFs = new StatFs(Environment.getDataDirectory().getAbsolutePath()); 
      StatFs statFs = new StatFs(Environment.getExternalStorageDirectory().getAbsolutePath()); 
      //StatFs statFs = new StatFs("/data"); 
      float free = ((float)statFs.getAvailableBlocks() * statFs.getBlockSize())/1048576; 
      return free; 
     } 

     public static float getInternalUsedSpace() { 
//    StatFs statFs = new StatFs(Environment.getDataDirectory().getAbsolutePath()); 
      StatFs statFs = new StatFs(Environment.getExternalStorageDirectory().getAbsolutePath()); 
      if(new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/wallpaperapp").isDirectory()) 
      { 
       statFs = new StatFs(Environment.getExternalStorageDirectory().getAbsolutePath()+"/wallpaperapp"); 
       //StatFs statFs = new StatFs("/data"); 
       float total = ((float)statFs.getBlockCount() * statFs.getBlockSize())/1048576; 
       float free = ((float)statFs.getAvailableBlocks() * statFs.getBlockSize())/1048576; 
       float busy = total - free; 
       return busy; 
      } 
      else 
       return 0; 
     } 

     public static int getDownloadCount() { 
      if(new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/wallpaperapp").isDirectory()) 
       return new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/wallpaperapp").listFiles().length; 
      else return 0; 
     } 
    } 

    } 

我正在製作一個應用程序，其中我有圖像列表，當我選擇任何圖像，所以得到big.and然後我想交換它的權利和離開。 當我換我的形象......，它不是swaping.i要交換我的形象，我怎麼能做到這一點

Answer 1

Try Out this . .I done this some time ago worked fine for me 

public class Swipe extends Activity implements OnClickListener { 

ImageView img; 

private static final int SWIPE_MIN_DISTANCE = 6; //120; 
private static final int SWIPE_MAX_OFF_PATH = 125; //250; 
private static final int SWIPE_THRESHOLD_VELOCITY = 100; //200; 


@Override 
public void onCreate(Bundle savedInstanceState) { 

    super.onCreate(savedInstanceState); 
    setContentView(R.layout.swipeimage); 
    img = (ImageView)findViewById(R.id.image_place_holder); 

    gestureScanner = new GestureDetector(this); 
    /* 
    img.setOnTouchListener(new OnTouchListener() { 
     public boolean onTouch(final View view, final MotionEvent event) { 
      // TODO Auto-generated method stub 
      gdt.onTouchEvent(event); 
      //Log.i("Hello my Log 1","How dfgfd are you"); 
      return true; 
     } 
    });*/ 
} 



@Override 
public void onClick(View v) { 

    // TODO Auto-generated method stub 

} 

    class myClass extends Activity implements OnGestureListener { 


    private static final int SWIPE_MIN_DISTANCE = 6; //120; 
    private static final int SWIPE_MAX_OFF_PATH = 125; //250; 
    private static final int SWIPE_THRESHOLD_VELOCITY = 100; //200; 
    private GestureDetector gestureScanner;@ 
    Override 
    public boolean onTouchEvent(MotionEvent me) { 
     return gestureScanner.onTouchEvent(me); 
    } 
    //@Override 
    public boolean onDown(MotionEvent e) { 
     //viewA.setText("-" + "DOWN" + "-"); 
     return true; 
    } 
    //@Override 
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { 
     try { 
      if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH) 
       return false; 
      // right to left swipe 
      if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) { 
       Toast.makeText(getApplicationContext(), "Left Swipe", Toast.LENGTH_SHORT).show(); 

      } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) { 
       Toast.makeText(getApplicationContext(), "Right Swipe", Toast.LENGTH_SHORT).show(); 

      } else if (e1.getY() - e2.getY() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) { 
       Toast.makeText(getApplicationContext(), "Swipe up", Toast.LENGTH_SHORT).show(); 

      } else if (e2.getY() - e1.getY() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) { 
       Toast.makeText(getApplicationContext(), "Swipe down", Toast.LENGTH_SHORT).show(); 

      } 
     } catch (Exception e) { 
      // nothing 
     } 

     return true; 
    } 
    /* @Override 
    public void onLongPress(MotionEvent e) { 
     Toast mToast = Toast.makeText(getApplicationContext(), "Long Press", Toast.LENGTH_SHORT); 
     mToast.show(); 
    }*/ 
    //@Override 
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { 
     //viewA.setText("-" + "SCROLL" + "-"); 
     return true; 
    } 
    //@Override 
    public void onShowPress(MotionEvent e) { 
     //viewA.setText("-" + "SHOW PRESS" + "-"); 
    } //@Override 
    public boolean onSingleTapUp(MotionEvent e) { 
     Toast mToast = Toast.makeText(getApplicationContext(), "Single Tap", Toast.LENGTH_SHORT); 
     mToast.show(); 
     return true; 
    } 
    @Override 
    public void onGesture(GestureOverlayView arg0, MotionEvent arg1) { 
     // TODO Auto-generated method stub 

    } 
    @Override 
    public void onGestureCancelled(GestureOverlayView arg0, MotionEvent arg1) { 
     // TODO Auto-generated method stub 

    } 
    @Override 
    public void onGestureEnded(GestureOverlayView arg0, MotionEvent arg1) { 
     // TODO Auto-generated method stub 

    } 
    @Override 
    public void onGestureStarted(GestureOverlayView arg0, MotionEvent arg1) { 
     // TODO Auto-generated method stub 

    } 
    } 
} 

希望它可以幫助你:-)