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通过相机拍摄后显示图像时出现问题?

image-processing android

UMAR-MOBITSOLUTIONS · 技术社区 · 15 年前

我面临的问题是当我拍照和按完成按钮它不显示我的活动中拍摄的图像。

它只显示空白图像字段。

有人告诉我我犯了什么错吗?可能是路径相关的问题,但我不确定。

protected Button _button;
    protected ImageView _image;
    protected TextView _field;
    protected String _path;
    protected boolean _taken;

    protected static final String PHOTO_TAKEN   = "photo_taken";

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

        setContentView(R.layout.main);

        _image = ( ImageView ) findViewById( R.id.image );
        _field = ( TextView ) findViewById( R.id.field );
        _button = ( Button ) findViewById( R.id.button );
        _button.setOnClickListener( new ButtonClickHandler() );

        _path = Environment.getExternalStorageDirectory() + "/images/media/make_machine_example.png";

      //media/external/images/media/2


    }

    public class ButtonClickHandler implements View.OnClickListener 
    {
        public void onClick( View view ){
            Log.i("MakeMachine", "ButtonClickHandler.onClick()" );
            startCameraActivity();
        }
    }

    protected void startCameraActivity()
    {
        Log.i("MakeMachine", "startCameraActivity()" );
        File file = new File( _path );
        Uri outputFileUri = Uri.fromFile( file );

        Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE );
        intent.putExtra( MediaStore.EXTRA_OUTPUT, outputFileUri );

        startActivityForResult( intent,0);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) 
    {   
        Log.i( "MakeMachine", "resultCode: " + resultCode );
        switch( resultCode )
        {
            case 0:
                Log.i( "MakeMachine", "User cancelled" );
                break;

            case -1:
                onPhotoTaken();
                break;
        }
    }

    protected void onPhotoTaken()
    {
        Log.i( "MakeMachine", "onPhotoTaken" );

        _taken = true;

        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inSampleSize = 4;


        Bitmap bitmap = BitmapFactory.decodeFile( _path, options );

        _image.setImageBitmap(bitmap);

        _field.setVisibility( View.GONE );
    }

2 回复 | 直到 15 年前

JeremyFromEarth 15 年前

确保您的设备上有一个文件夹结构,该结构与您在intent中发送的路径相匹配。
http://labs.makemachine.net/2010/03/simple-android-photo-capture/comment-page-1/#comment-143

您需要在设备上手动创建图像/媒体文件夹。它们不会通过尝试在那里保存文件来自动创建。

Mohammedsalim Shivani 8 年前

这就是我要找的

目录结构我正在通过我捕获的Uri数据,现在我可以显示图像。

无需使用硬编码图像路径。

public String getRealPathFromURI(Uri contentUri) {   

    // can post image   
    String [] proj={MediaStore.Images.Media.DATA};   
    Cursor cursor = managedQuery( contentUri,   
            proj, // Which columns to return   
            null,       // WHERE clause; which rows to return (all rows)   
            null,       // WHERE clause selection arguments (none)   
            null); // Order-by clause (ascending by name)   
    int column_index = 
    cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);   
    cursor.moveToFirst();   

    return cursor.getString(column_index);   
}