我正在实现一个数据库，其中每个项目（植物）都有一个图像库。对于数据库中的每个植物，我都会创建一个文件夹来存储图像。
当我查看一个项目时，我希望它的详细信息与图像库一起显示，但是画廊应该是空白的部分。
我不确定我的 xml 或代码是否应该受到责备，所以这里是 xml...
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:stretchColumns="*">
...Content Removed...
</TableLayout>
<Gallery xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/plant_gallery"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</ScrollView>
...和代码...
public class Plant extends Activity
{
private PlantDatabase pDatabase;
Cursor plantC;
private boolean mExternalStorageAvailable = false;
private boolean mExternalStorageWriteable = false;
private String state;
File plantDir;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.plant);
Bundle b = getIntent().getExtras();
String plantID = b.getString("id");
state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state))
{
// We can read and write
mExternalStorageAvailable = mExternalStorageWriteable = true;
}
else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state))
{
// We can only read
mExternalStorageAvailable = true;
mExternalStorageWriteable = false;
}
else
{
// We have no access
mExternalStorageAvailable = mExternalStorageWriteable = false;
}
if (mExternalStorageAvailable)
{
plantDir = new File(Environment.getExternalStorageDirectory() + "/PlantLog/" + plantID);
if (!plantDir.exists())
{
if (mExternalStorageWriteable)
{
if (!plantDir.mkdirs())
{
Toast.makeText(this, "Unable to make image directory for current plant", Toast.LENGTH_LONG).show();
}
}
}
plantDir = new File(Environment.getExternalStorageDirectory() + "/PlantLog/" + plantID);
if (plantDir.exists())
{
Gallery g = (Gallery)findViewById(R.id.plant_gallery);
g.setAdapter(new ImageAdapter(this, getImageList(plantID)));
g.setOnItemClickListener(new OnItemClickListener()
{
public void onItemClick(AdapterView<?> parent, View v,
int position, long id)
{
}
});
}
}
pDatabase = new PlantDatabase(this);
plantC = pDatabase.getPlant(plantID);
plantC.moveToFirst();
TextView t;
// Display results
t = (TextView)findViewById(R.id.plant_dbid);
t.setText(plantC.getString(0));
t = (TextView)findViewById(R.id.plant_plantid);
t.setText(plantC.getString(1));
t = (TextView)findViewById(R.id.plant_commonname);
t.setText(plantC.getString(2));
t = (TextView)findViewById(R.id.plant_family);
t.setText(plantC.getString(3));
t = (TextView)findViewById(R.id.plant_genus);
t.setText(plantC.getString(4));
t = (TextView)findViewById(R.id.plant_species);
t.setText(plantC.getString(5));
t = (TextView)findViewById(R.id.plant_variety);
t.setText(plantC.getString(6));
t = (TextView)findViewById(R.id.plant_form);
t.setText(plantC.getString(7));
t = (TextView)findViewById(R.id.plant_cultivar);
t.setText(plantC.getString(8));
t = (TextView)findViewById(R.id.plant_synonyms);
t.setText(plantC.getString(9));
t = (TextView)findViewById(R.id.plant_flowercolour);
t.setText(plantC.getString(10));
t = (TextView)findViewById(R.id.plant_datesown);
t.setText(plantC.getString(11));
t = (TextView)findViewById(R.id.plant_dateacquired);
t.setText(plantC.getString(12));
t = (TextView)findViewById(R.id.plant_pricepaid);
t.setText(plantC.getString(13));
t = (TextView)findViewById(R.id.plant_growingnotes);
t.setText(plantC.getString(14));
}
private List<String> getImageList(String dir)
{
List<String> tFileList = new ArrayList<String>();
File f = new File(Environment.getExternalStorageDirectory() + "/PlantLog/" + dir);
File[] files = f.listFiles();
for (int i = 0; i < files.length; i++)
{
File file = files[i];
// Check file is jpg image
if (file.getPath().endsWith(".jpg"))
{
tFileList.add(file.getPath());
}
}
return tFileList;
}
public class ImageAdapter extends BaseAdapter
{
private Context mContext;
private List<String> fileList;
private ImageView i;
private int mGalleryItemBackground;
public ImageAdapter(Context c, List<String> fList)
{
mContext = c;
fileList = fList;
i = new ImageView(mContext);
TypedArray a = obtainStyledAttributes(R.styleable.Gallery1);
mGalleryItemBackground = a.getResourceId(R.styleable.Gallery1_android_galleryItemBackground, 0);
a.recycle();
}
public int getCount()
{
return fileList.size();
}
public Object getItem(int position)
{
return position;
}
public long getItemId(int position)
{
return position;
}
public View getView(int position, View convertView,
ViewGroup parent)
{
System.gc();
if (convertView == null)
{
try
{
Bitmap bm = BitmapFactory.decodeFile(fileList.get(position).toString());
i.setImageBitmap(bm);
i.setLayoutParams(new Gallery.LayoutParams(150, 100));
i.setScaleType(ImageView.ScaleType.FIT_XY);
i.setBackgroundResource(mGalleryItemBackground);
}
catch (Exception e)
{
// Nothing to see here
}
}
return i;
}
}
}
抱歉，它太长了，但希望我已经包含了足够的内容。图库主要基于 Gallery 示例，但经过调整以匹配我的代码。如果有人知道为什么不显示图像，我将不胜感激！
谢谢！