java - 捕获图像时应用程序崩溃

Question

我的代码有什么问题吗？我的应用程序中有一个简单的相机功能，它可以用来从图库中选择图像和拍照。一切正常，只是无法检索捕获的图像。

Claims.java(插入图片)

  button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View arg0) {

                if ((name != null && name.trim().length() > 0) && (result != null && result.trim().length() > 0)) {
                   // Toast.makeText(getActivity().getApplicationContext(), fk+"", Toast.LENGTH_LONG).show();
                    byte[] data=getBitmapAsByteArray(Global.img); // this is a function
                    if(data==null)
                    {
                        Toast.makeText(getActivity(), "null", Toast.LENGTH_LONG).show();
                    }
                    else
                    {


                        Toast.makeText(getActivity(), " not null", Toast.LENGTH_LONG).show();
                        SB.insertStaffBenefit(name, data, description, result, fk);
                    }

            }

        });
        return claims;
    }

ViewView.java(导航项之一)

  listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> listView, View view,
                                    int position, long id) {
                // Get the cursor, positioned to the corresponding row in the result set
                Cursor cursor = (Cursor) listView.getItemAtPosition(position);

                // Get the state's capital from this row in the database.
                String ID =
                        cursor.getString(cursor.getColumnIndexOrThrow("_id"));

                Intent intent = new Intent(ViewView.this.getActivity(), Receipt.class);
                intent.putExtra("ID", ID);
                startActivity(intent);
            }
        });

收据.java

public class Receipt extends AppCompatActivity {

    private SQLiteDatabase database;
    private MyDatabaseHelper dbHelper;
    private Cursor c;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.receipt);
        dbHelper = new MyDatabaseHelper(this);
        final String k = getIntent().getExtras().getString("ID");
        Toast.makeText(getApplicationContext(), k+"", Toast.LENGTH_LONG).show();
        RetrieveImage(k);
}

    public void RetrieveImage(String b)
    {
        ImageView a=(ImageView)findViewById(R.id.imageView5);
        database = dbHelper.getWritableDatabase();
        c = database.rawQuery("SELECT s.Image FROM Information i LEFT JOIN StaffBenefit s ON s.Twd_id=i._id WHERE i._id=? ", new String[]{String.valueOf(b)},null);
        if(c!=null)
        {
            while (c.moveToNext()) {
               byte[] img=c.getBlob(c.getColumnIndex("Image"));
                if(img!=null)
                {
                    Log.e("TAG", " Not null");
                }
                else
                {
                    Log.e("TAG", " null");
                }
                ByteArrayInputStream imageStream = new ByteArrayInputStream(img);
                Bitmap theImage= BitmapFactory.decodeStream(imageStream);
                a.setImageBitmap(theImage);

            }
        }
        c.close();
    }
}

从图库中选择的图像可以检索到 Receipt.java 中的 a，但如果捕获的图像尝试检索并显示在 a 上，应用程序会崩溃.

Process: com.example.project.project, PID: 26303
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.project.project/com.example.project.project.Receipt}:
java.lang.IllegalStateException: Couldn't read row 0, col 0 from
CursorWindow.  Make sure the Cursor is initialized correctly before
accessing data from it.
         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2413)
         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2471)
         at android.app.ActivityThread.access$900(ActivityThread.java:175)
         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308)
         at android.os.Handler.dispatchMessage(Handler.java:102)
         at android.os.Looper.loop(Looper.java:146)
         at android.app.ActivityThread.main(ActivityThread.java:5602)
         at java.lang.reflect.Method.invokeNative(Native Method)
         at java.lang.reflect.Method.invoke(Method.java:515)
         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
         at dalvik.system.NativeStart.main(Native Method)
  Caused by: java.lang.IllegalStateException: Couldn't read row 0, col 0 from CursorWindow.  Make sure the Cursor is initialized correctly before accessing data from it.
         at android.database.CursorWindow.nativeGetBlob(Native Method)
         at android.database.CursorWindow.getBlob(CursorWindow.java:404)
         at android.database.AbstractWindowedCursor.getBlob(AbstractWindowedCursor.java:45)
         at com.example.project.project.Receipt.RetrieveImage(Receipt.java:43)
         at com.example.project.project.Receipt.onCreate(Receipt.java:32)

(Receipt.java:43)

  byte[] img=c.getBlob(c.getColumnIndex("Image"));

(收据.java:32)

RetrieveImage(k);

为什么它适用于从图库中选择图像，但不适用于拍照？是不是因为图片没有插入成功？

Answer 1

您应该调用cursor.moveToFirst()。首先移动光标位置并删除 while 循环(我认为不需要)。

if(c.moveToFirst())
    {
           byte[] img=c.getBlob(c.getColumnIndex("Image"));
            if(img!=null)
            {
                Log.e("TAG", " Not null");
            }
            else
            {
                Log.e("TAG", " null");
            }
            ByteArrayInputStream imageStream = new ByteArrayInputStream(img);
            Bitmap theImage= BitmapFactory.decodeStream(imageStream);
            a.setImageBitmap(theImage);

        }
    }