Android：ClickListener從gridview查看全尺寸縮略圖.jpeg

Question

我是剛剛接觸android並且一直在使用教程，該教程加載SD卡上目錄中的所有圖像。我正在運行該教程，但希望向點擊偵聽器添加一些代碼，該代碼將在GridView映像適配器中加載縮略圖的全尺寸版本。

public class PicturesFragment extends Fragment { 

public class ImageAdapter extends BaseAdapter { 

private Context mContext; 
ArrayList<String> itemList = new ArrayList<String>(); 

public ImageAdapter(Context c) { 
    mContext = c; 
} 

void add(String path) { 
    itemList.add(path); 
} 

@Override 
public int getCount() { 
    return itemList.size(); 
} 

@Override 
public Object getItem(int position) { 
    // TODO Auto-generated method stub 
    return itemList.get(position); 
} 

@Override 
public long getItemId(int position) { 
    // TODO Auto-generated method stub 
    return 0; 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
    ImageView imageView; 
    if (convertView == null) { // if it's not recycled, initialize some 
           // attributes 
     imageView = new ImageView(mContext); 
     imageView.setLayoutParams(new GridView.LayoutParams(225, 225)); 
     imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); 
     imageView.setPadding(1, 1, 1, 1); 
    } else { 
     imageView = (ImageView) convertView; 
    } 

    Bitmap bm = decodeSampledBitmapFromUri(itemList.get(position), 220, 
      220); 

    imageView.setImageBitmap(bm); 
    return imageView; 
} 

public Bitmap decodeSampledBitmapFromUri(String path, int reqWidth, 
     int reqHeight) { 

    Bitmap bm = null; 
    // First decode with inJustDecodeBounds=true to check dimensions 
    final BitmapFactory.Options options = new BitmapFactory.Options(); 
    options.inJustDecodeBounds = true; 
    BitmapFactory.decodeFile(path, options); 

    // Calculate inSampleSize 
    options.inSampleSize = calculateInSampleSize(options, reqWidth, 
      reqHeight); 

    // Decode bitmap with inSampleSize set 
    options.inJustDecodeBounds = false; 
    bm = BitmapFactory.decodeFile(path, options); 

    return bm; 
} 

public int calculateInSampleSize(

BitmapFactory.Options options, int reqWidth, int reqHeight) { 
    // Raw height and width of image 
    final int height = options.outHeight; 
    final int width = options.outWidth; 
    int inSampleSize = 1; 

    if (height > reqHeight || width > reqWidth) { 
     if (width > height) { 
      inSampleSize = Math.round((float) height 
        /(float) reqHeight); 
     } else { 
      inSampleSize = Math.round((float) width/(float) reqWidth); 
     } 
    } 

    return inSampleSize; 
} 

} 

ImageAdapter myImageAdapter; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
    Bundle savedInstanceState) { 

View rootView = inflater.inflate(R.layout.pictures_fragment, container, false); 

GridView gridview = (GridView) rootView.findViewById(R.id.gridview); 
myImageAdapter = new ImageAdapter(getActivity()); 
gridview.setAdapter(myImageAdapter); 

String ExternalStorageDirectoryPath = Environment 
     .getExternalStorageDirectory().getAbsolutePath(); 

String targetPath = ExternalStorageDirectoryPath + "/myfilepath/Images"; 

Toast.makeText(getActivity().getApplicationContext(), targetPath, Toast.LENGTH_LONG) 
     .show(); 
File targetDirector = new File(targetPath); 

File[] files = targetDirector.listFiles(); 
for (File file : files) { 
    myImageAdapter.add(file.getAbsolutePath()); 
} 

gridview.setOnItemClickListener(myOnItemClickListener); 


Button camerabtn = (Button) rootView.findViewById(R.id.camerabtn); 

camerabtn.setOnClickListener(new OnClickListener() { 
    @Override 
    public void onClick(View v) { 
     Intent intent = new Intent(v.getContext(), CameraActivity.class); 
     startActivityForResult(intent, 0); 
    } 
}); 

    return rootView; 
} 

這裏是點擊偵聽器，我相信我應該實現代碼來解決這個問題。我想我應該可以啓動另一個活動（FullImageActivity.class），它只是包含一個ImageView的佈局，並通過已被點擊到這個新的活動圖像，但我很少知道如何去了解這個

OnItemClickListener myOnItemClickListener = new OnItemClickListener() { 

@Override 
public void onItemClick(AdapterView<?> parent, View view, int position, 
     long id) { 
    String prompt = (String) parent.getItemAtPosition(position); 
    Toast.makeText(getActivity().getApplicationContext(), prompt, Toast.LENGTH_LONG) 
      .show(); 

    //Intent i = new Intent(getActivity().getApplicationContext(), FullImageActivity.class); 

    // startActivity(i); 

    } 
    }; 
} 

任何幫助將不勝感激。

Answer 1

是，改變onItemClick這樣的..

@Override 
    public void onItemClick(AdapterView<?> parent, View view, int position, 
    long id) { 
    String path = (String) myImageAdapter.getItem(position); 

    Intent intent = new Intent(this, FullImageActivity.class); 
    intent.putExtra("IMAGEPATH",path); 
    startActivity(intent); 

    } 

而且在FullImageActivity有一個佈局，顯示從路徑的完整圖像。 你可以在FullImageActivity的onCreate（路徑）

public class FullImageActivity extends ActionBarActivity{ 

@Override 
public void onCreate(Bundle bundle){ 

    super.onCreate(bundle); 
    setContentView(R.layout.image_layout); 
    String path = getIntent().getStringExtra("IMAGEPATH"); 
    // load the image from the path and set it to the imageview in layout 

} 
}