android - 从 SQLite 到 ListView 的 getBitmap

Question

我正在尝试显示Contact来自 android 应用程序的个人资料图片，SQLite但它不起作用，并且在image.setImageBitmap(bitmap)出现时崩溃.NullPointerException，我不知道为什么。

如果有人可以帮助我，请。这是我的代码：

public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);

    DatabaseHandler helper = new DatabaseHandler(this);
    database = helper.getWritableDatabase();
    Cursor data = database.query("amigos", fields, null, null, null, null, null);
    data.moveToFirst();
    dataSource = new SimpleCursorAdapter(this, R.layout.row_def, data, fields, new int[] {R.id.Nombre_Amigo, R.id.profile_picture});

    Log.d("ListarContactos","Oncreate....data: "+data.toString());

        while (!data.isAfterLast()){    
            byte[] bb = data.getBlob(data.getColumnIndex(DatabaseHandler.KEY_PIC_SQ));
            Log.d("ListarContactos","Oncreate....bb: "+bb.toString());
            ByteArrayInputStream inputStream = new ByteArrayInputStream(bb);
            Log.d("ListarContactos","Oncreate....inputStream: "+inputStream.toString());
            Bitmap bitmap = BitmapFactory.decodeByteArray(bb, 0, bb.length);
            Log.d("ListarContactos","Oncreate....Bitmap: "+bitmap.toString());
            ImageView image = (ImageView) findViewById(R.id.profile_picture);
            image.setImageBitmap(bitmap);
            Log.d("ListarContactos","Oncreate....image: "+image.toString());
        }

    Log.d("ListarContactos","Oncreate....datasource: "+dataSource.toString());      
    setListAdapter(dataSource);
    Log.d("ListarContactos","Oncreate....despres del ListAdapter");     
    helper.close();
    ListView view = getListView();
}

Answer 1

它抛出nullPointerException是因为方法 BitmapFactory.decodeByteArray(bb, 0, bb.length)返回NULL位图。