我想尝试将图像存储到SD卡中并显示出来是否有效。但是，我的图像无法显示。请帮我查一下我的问题。
public class SDCard_Image {
//read drawable files
Resources res = getResources();
Drawable drawable = res.getDrawable(R.drawable.mood_1);
//insert into sd card(?)
public static boolean StoreByteImage(Context mContext, byte[] imageData,
int quality, String expName) {
File sdImageMainDirectory = new File("/sdcard/myImages");
FileOutputStream fileOutputStream = null;
FileOutputStream fileOutputStream2 = null;
FileOutputStream fileOutputStream3 = null;
FileOutputStream fileOutputStream4 = null;
FileOutputStream fileOutputStream5 = null;
FileOutputStream fileOutputStream6 = null;
FileOutputStream fileOutputStream7 = null;
FileOutputStream fileOutputStream8 = null;
FileOutputStream fileOutputStream9 = null;
FileOutputStream fileOutputStream10 = null;
FileOutputStream fileOutputStream11 = null;
FileOutputStream fileOutputStream12 = null;
FileOutputStream fileOutputStream13 = null;
FileOutputStream fileOutputStream14 = null;
FileOutputStream fileOutputStream15 = null;
FileOutputStream fileOutputStream16 = null;
String mood_1 = null;
String mood_2 = null;
String mood_3 = null;
String mood_4 = null;
String mood_5 = null;
String mood_6 = null;
String mood_7 = null;
String mood_8 = null;
String mood_9 = null;
String mood_10 = null;
String mood_11 = null;
String mood_12 = null;
String mood_13 = null;
String mood_14 = null;
String mood_15 = null;
String mood_16 = null;
try {
BitmapFactory.Options options=new BitmapFactory.Options();
options.inSampleSize = 5;
Bitmap myImage = BitmapFactory.decodeByteArray(imageData, 0,
imageData.length,options);
fileOutputStream = new FileOutputStream(
sdImageMainDirectory.toString() +"/" + mood_1 + ".jpg");
fileOutputStream2 = new FileOutputStream(
sdImageMainDirectory.toString() +"/" + mood_2 + ".jpg");
fileOutputStream3 = new FileOutputStream(
sdImageMainDirectory.toString() +"/" + mood_3 + ".jpg");
fileOutputStream4 = new FileOutputStream(
sdImageMainDirectory.toString() +"/" + mood_4 + ".jpg");
fileOutputStream5 = new FileOutputStream(
sdImageMainDirectory.toString() +"/" + mood_5 + ".jpg");
fileOutputStream6 = new FileOutputStream(
sdImageMainDirectory.toString() +"/" + mood_6 + ".jpg");
fileOutputStream7 = new FileOutputStream(
sdImageMainDirectory.toString() +"/" + mood_7 + ".jpg");
fileOutputStream8 = new FileOutputStream(
sdImageMainDirectory.toString() +"/" + mood_8 + ".jpg");
fileOutputStream9 = new FileOutputStream(
sdImageMainDirectory.toString() +"/" + mood_9 + ".jpg");
fileOutputStream10 = new FileOutputStream(
sdImageMainDirectory.toString() +"/" + mood_10 + ".jpg");
fileOutputStream11 = new FileOutputStream(
sdImageMainDirectory.toString() +"/" + mood_11 + ".jpg");
fileOutputStream12 = new FileOutputStream(
sdImageMainDirectory.toString() +"/" + mood_12 + ".jpg");
fileOutputStream13 = new FileOutputStream(
sdImageMainDirectory.toString() +"/" + mood_13 + ".jpg");
fileOutputStream14 = new FileOutputStream(
sdImageMainDirectory.toString() +"/" + mood_14 + ".jpg");
fileOutputStream15 = new FileOutputStream(
sdImageMainDirectory.toString() +"/" + mood_15 + ".jpg");
fileOutputStream16 = new FileOutputStream(
sdImageMainDirectory.toString() +"/" + mood_16 + ".jpg");
BufferedOutputStream bos = new BufferedOutputStream(
fileOutputStream);
myImage.compress(CompressFormat.JPEG, quality, bos);
bos.flush();
bos.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return true;
}
private Resources getResources() {
// TODO Auto-generated method stub
return null;
}
}
这是我想要展示我的图像的部分：
public class SDCardImagesActivity extends Activity {
private Cursor cursor;
private int columnIndex;
private DBAdapter db;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mood);
db = new DBAdapter(this);
db.open();
// Set up an array of the Thumbnail Image ID column we want
String[] projection = {MediaStore.Images.Thumbnails._ID};
// Create the cursor pointing to the SDCard
cursor = managedQuery( MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI,
projection, // Which columns to return
null, // Return all rows
null,
MediaStore.Images.Thumbnails.IMAGE_ID);
columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID);
GridView sdcardImages = (GridView) findViewById(R.id.gridview);
sdcardImages.setAdapter(new ImageAdapter(this));
// Set up a click listener
sdcardImages.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView parent, View v, int position, long id) {
// Get the data location of the image
String[] projection = {MediaStore.Images.Media.DATA};
cursor = managedQuery( MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
projection, // Which columns to return
null, // Return all rows
null,
null);
columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToPosition(position);
// Get image filename
String imagePath = cursor.getString(columnIndex);
// Use this path to do further processing, i.e. full screen display
}
});
}
private class ImageAdapter extends BaseAdapter {
private Context context;
public ImageAdapter(Context localContext) {
context = localContext;
}
public int getCount() {
return cursor.getCount();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ImageView picturesView;
if (convertView == null) {
picturesView = new ImageView(context);
// Move cursor to current position
cursor.moveToPosition(position);
// Get the current value for the requested column
int imageID = cursor.getInt(columnIndex);
// Set the content of the image based on the provided URI
picturesView.setImageURI(Uri.withAppendedPath(
MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, "" + imageID));
picturesView.setScaleType(ImageView.ScaleType.FIT_CENTER);
picturesView.setPadding(8, 8, 8, 8);
picturesView.setLayoutParams(new GridView.LayoutParams(100, 100));
}
else {
picturesView = (ImageView)convertView;
}
return picturesView;
}
}
}
对不起，代码很长，但谢谢！
答案 0 :(得分：1)
强制扫描整个SDCARD使用 sendBroadcast（new Intent（Intent.ACTION_MEDIA_MOUNTED，Uri.parse（“file：//”） + Environment.getExternalStorageDirectory（））））;
或仅扫描特定文件夹使用 sendBroadcast（new Intent（Intent.ACTION_MEDIA_MOUNTED，Uri.parse（“file：// FolderName”） + Environment.getExternalStorageDirectory（））））;
答案 1 :(得分：0)