尝试显示从相机意图拍摄的图像

Question

我目前正在尝试从MainActivity的默认相机意图拍摄照片，然后将该图像放入同一活动的ImageView中。

我正在保存图像，以使拍摄的图像覆盖先前拍摄的图像（在这种情况下，我将图像称为test.jpg并将其存储在sdcard中）

我的代码现在遇到的问题是ImageView显示了应用程序上次运行时拍摄的照片。

这是我的代码。

public class MainActivity extends Activity 
{
ImageView imv;
@Override
protected void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    imv = (ImageView)findViewById(R.id.imv);
    Uri uri = null;
    String path = Environment.getExternalStorageDirectory().getAbsolutePath()+"/test.jpg";
    try
    {
        uri = takePhoto(path);
    }
    catch(Exception e)
    {
        e.printStackTrace();
    }
    imv.setImageURI(uri);
}

private Uri takePhoto(String path) throws IOException
{
    File photo = new File(path);
    photo.createNewFile();
    Uri fileUri = Uri.fromFile(photo);
    Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
    startActivityForResult(cameraIntent, 0);
    fileUri = Uri.fromFile(new File(path));
    return fileUri;
}   
}

Answer 1

尝试在onActivityResult设置图像，如下所示：

  protected void onActivityResult(int requestCode, int resultCode, Intent ata)                                     
          {
if (requestCode == 0) {
    if (resultCode == RESULT_OK) {

       imv = (ImageView)findViewById(R.id.imv);
        Bitmap photo = (Bitmap) data.getExtras().get("data");
        imv.setImageBitmap(photo);
    }}}

Answer 2

 private static final int     PICK_CONTACT_REQUEST = 0 ;
 protected void onActivityResult(int requestCode, int resultCode,
                 Intent data) {
             if (requestCode == PICK_CONTACT_REQUEST) {
                 if (resultCode == RESULT_OK) {

                    imv.setImageURI(uri);

                 }
             }
         }

将图像设置为不活动状态，它将显示从相机拍摄的新图像。

Answer 3

尝试这个，

private Uri takePhoto(String path) throws IOException
    {
        File photo = new File(path);
        photo.createNewFile();
        if(photo.exists())
            photo.delete();
        photo = new File(path);
        Uri fileUri = Uri.fromFile(photo);
        Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
        startActivityForResult(cameraIntent, 0);
        fileUri = Uri.fromFile(new File(path));
        return fileUri;
    }