Question

<p ng-click = "editing = !editing"> edit </p>
{{!editing}}

默认情况下{{!editing}}打印为true，当我点击编辑时它也显示为true。我的问题是为什么逻辑不（!）显示为真。

Answer 1

使用ng-init将编辑变量初始化为所需的值。默认情况下，值应为false（因为它的值未定义）。

public class MainActivity extends Activity {

private Uri fileUri;
private ImageView img_forCompress;
public static final int MEDIA_TYPE_IMAGE = 1;
private static final int CAMERA_REQUEST = 1888;
private static final int CAMERA_CAPTURE_IMAGE_REQUEST_CODE = 100;
private static final String IMAGE_DIRECTORY_NAME = "Ibook";
static File mediaFile;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    img_forCompress = (ImageView) findViewById(R.id.img_forCompress);

    img_forCompress.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

            fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);

            intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);

            // start the image capture Intent
            startActivityForResult(intent,
                    CAMERA_CAPTURE_IMAGE_REQUEST_CODE);
        }
    });

}

public Uri getOutputMediaFileUri(int type) {
    return Uri.fromFile(getOutputMediaFile(type));
}

private static File getOutputMediaFile(int type) {

    // External sdcard location
    File mediaStorageDir = new File(
            Environment
                    .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
            IMAGE_DIRECTORY_NAME);

    // Create the storage directory if it does not exist
    if (!mediaStorageDir.exists()) {
        if (!mediaStorageDir.mkdirs()) {
            Log.d(IMAGE_DIRECTORY_NAME, "Oops! Failed create "
                    + IMAGE_DIRECTORY_NAME + " directory");
            return null;
        }
    }

    // Create a media file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
            Locale.getDefault()).format(new Date());

    if (type == MEDIA_TYPE_IMAGE) {
        mediaFile = new File(mediaStorageDir.getPath() + File.separator
                + "IMG_" + timeStamp + ".jpg");
    } else {
        return null;
    }
    Log.e("path", "media file:-" + mediaFile);
    return mediaFile;
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // TODO Auto-generated method stub
    super.onActivityResult(requestCode, resultCode, data);

    Log.e("path", "" + mediaFile.toString());
    String filename = mediaFile.toString();

    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inPreferredConfig = Bitmap.Config.ARGB_8888;
    Bitmap bitmap = BitmapFactory.decodeFile(filename, options);

    compressImage(bitmap);

}



private void compressImage(Bitmap photo) {
    // TODO Auto-generated method stub
    int imageWidth = photo.getWidth();
    int imageHeight = photo.getHeight();
    long length = mediaFile.length();
    int newHeight = 0;
    int newWidth = 0;

    Toast.makeText(MainActivity.this, "oldwidth="+imageWidth+",oldHeight="+imageHeight,Toast.LENGTH_LONG).show();
    Log.e("Old Image gheight and width---------", imageWidth + "-------"
            + imageHeight + " and Size is -- " + length);
    if (imageHeight > 1500 || imageWidth > 1500) {
        if (imageHeight > imageWidth) {
            Log.e("height is more", "true");
            newHeight = 1200;
            newWidth = (newHeight * imageWidth / imageHeight);
        }
        if (imageWidth > imageHeight) {
            Log.e("width is more", "true");
            newWidth = 1200;
            newHeight = (newWidth * imageHeight / imageWidth);
        }
    }
    Toast.makeText(MainActivity.this, "newwidth="+newWidth+",newHeight="+newHeight,Toast.LENGTH_LONG).show();
    Log.e("new Image gheight and width---------", newHeight + "-------"

Angular js ng-click对象，逻辑非（！）默认为true或false

1 个答案: