java/android不能在activity之间传递byte数组

Question

我正在尝试制作一个拍照应用程序。

主要 Activity 上有作为预览的表面 View 和“拍照”按钮。在第二个 Activity 中，有一些图片信息的 textView 和显示图片的 imageView；

我尝试通过 putExtra() 方法传输数据。

关于mainActivity中的代码

public void onPictureTaken(byte[] data, Camera camera) 
{
    // TODO Auto-generated method stub

    RecognizedActivity = new Intent(MainActivity.this, recognized.class);

    RecognizedActivity.putExtra("score", rFace.score);

    //RecognizedActivity.putExtra("leyex", rFace.leftEye.x);
    //RecognizedActivity.putExtra("leyex", rFace.leftEye.x);
    /*RecognizedActivity.putExtra("leye_y", rFace.leftEye.y);
    RecognizedActivity.putExtra("reye_x", rFace.rightEye.x);
    RecognizedActivity.putExtra("reye_y", rFace.rightEye.y);

    RecognizedActivity.putExtra("mouth_x", rFace.mouth.x);
    RecognizedActivity.putExtra("mouth_y", rFace.mouth.y);
    */
    RecognizedActivity.putExtra("rect_bottom"   , rFace.rect.bottom);
    RecognizedActivity.putExtra("rect_right"    , rFace.rect.right);
    RecognizedActivity.putExtra("rect_left"     , rFace.rect.left);
    RecognizedActivity.putExtra("rect_top"      , rFace.rect.top);

    //RecognizedActivity.putExtra("picture", data);
    RecognizedActivity.putExtra("pic", data);

    startActivity(RecognizedActivity);

    cam.startPreview();
}

关于接收 Activity

public class recognized extends Activity 
{
int score;
int leye_x, leye_y;
int reye_x, reye_y;

int mouth_x, mouth_y;

int r_bottom, r_top, r_left, r_right;

byte[] picture;
TextView tvFaceInfo;
ImageView ivFaceDisplay;
@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.recognized);

    Intent i = getIntent();
    tvFaceInfo = (TextView) findViewById(R.id.tvFaceInfo);
    ivFaceDisplay = (ImageView) findViewById(R.id.ivFacePicture);

    score       = i.getIntExtra("score", -1);

    r_bottom    = i.getIntExtra("rect_bottom"   , -1);
    r_right     = i.getIntExtra("rect_right"    , -1);
    r_left      = i.getIntExtra("rect_left"     , -1);
    r_top       = i.getIntExtra("rect_top"      , -1);

    picture     = i.getByteArrayExtra("pic");// getByteArrayExtra("picture");

    Bitmap bm = BitmapFactory.decodeByteArray(picture, 0, 1280*960);        
    //bm.copyPixelsFromBuffer(picture);
    ivFaceDisplay.setImageBitmap(bm);
    tvFaceInfo.setText("score: " + score + "\n"
                        + "rect " + r_bottom + " " + r_right + " " + r_left + " " + r_top);
}
}

当调试器启动时 图片 = i.getByteArrayExtra("图片");抛出异常

“找不到来源”

怎么了？

Answer 1

您可以在流程(您的案例中的 Activity )之间传递有限数量的数据。不是传递字节数组本身，而是将字节数组(图像)保存为文件并传递到该文件的路径(例如 ContentProvider 的 URI)。