[英]How to resize input image
How to resize 2 images in android , as one image which remain constant ( .png
image in drawable folder) should be equal to the size of input image (image enter from the user from mobile gallery) . 如何在android中调整2张图片的大小,因为一张图片保持不变(可绘制文件夹中的
.png
图片)应等于输入图片的大小(从用户从移动图片库输入的图片)。 I use resize(src, dst)
function in opencv for resizing two images , don't have any idea of this kind of function in java end as I check this post as well but it look some kind of extra loaded work to me. 我在opencv中使用
resize(src, dst)
函数来调整两个图像的大小,在我也检查这篇文章的同时,在java端对这种功能也不了解,但对我来说看起来有些额外的工作。
I know some method about image operation in android. 我知道一些有关android中图像操作的方法。
Transform Drawable to Bitmap: 将Drawable转换为位图:
public static Bitmap drawableToBitmap(Drawable drawable) {
int width = drawable.getIntrinsicWidth();
int height = drawable.getIntrinsicHeight();
Bitmap bitmap = Bitmap.createBitmap(width, height, drawable
.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
: Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, width, height);
drawable.draw(canvas);
return bitmap;
}
Resize Bitmap: 调整位图大小:
public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
Matrix matrix = new Matrix();
float scaleWidht = ((float) w / width);
float scaleHeight = ((float) h / height);
matrix.postScale(scaleWidht, scaleHeight);
Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height,
matrix, true);
return newbmp;
}
You can transform your first Drawable image to Bitmap, then resize it with the second method. 您可以将第一个Drawable图像转换为Bitmap,然后使用第二种方法调整其大小。 Use getWidth() and getHeight() to get parameters of the image.
使用getWidth()和getHeight()获取图像参数。
I don't know whether this is the best solution. 我不知道这是否是最佳解决方案。 If I didn't understand your intent well, make a comment and I can edit my answer.
如果我不太了解您的意图,请发表评论,然后编辑答案。
Edit: 编辑:
You can get Uri or the path of the image right? 您可以获取Uri或图像的路径正确吗?
If you get Uri, use String path = uri.getPath();
如果您获得Uri,请使用
String path = uri.getPath();
to get the path. 获得路径。
Then 然后
Decode Bitmap from file: 从文件解码位图:
public static Bitmap getBitmap(String path) {
return BitmapFactory.decodeFile(String path);
}
If the size of image is not too big, load it directly wouldn't cause memory leaks, everything is OK. 如果图像的大小不是太大,直接加载它不会导致内存泄漏,一切正常。
But if you don't know the size, I recommend the next method. 但是,如果您不知道大小,我建议使用下一种方法。
Decode BitmapDrawable from path: 从路径解码BitmapDrawable:
public static BitmapDrawable getScaledDrawable(Activity a, String path) {
Display display = a.getWindowManager().getDefaultDisplay();
float destWidth = display.getWidth();
float destHeight = display.getHeight();
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, options);
float srcWidth = options.outWidth;
float srcHeight = options.outHeight;
int inSampleSize = 1;
if (srcHeight > destHeight || srcWidth > destWidth) {
if (srcWidth > srcHeight) {
inSampleSize = Math.round(srcHeight / destHeight);
} else {
inSampleSize = Math.round(srcWidth / destWidth);
}
}
options = new BitmapFactory.Options();
options.inSampleSize = inSampleSize;
Bitmap bitmap = BitmapFactory.decodeFile(path, options);
return new BitmapDrawable(a.getResources(), bitmap);
}
This method will return a scaled BitmapDrawable object to prevent memory leaks. 此方法将返回缩放后的BitmapDrawable对象,以防止内存泄漏。
If you need Bitmap
not BitmapDrawable
, just return bitmap. 如果您需要
Bitmap
而不是BitmapDrawable
,则只需返回位图。
Edit2: EDIT2:
ThirdActivity.java : ThirdActivity.java:
public class ThirdActivity extends ActionBarActivity {
private static final int REQUEST_IMAGE = 0;
private Bitmap bitmapToResize;
private Button mGetImageButton;
private Button mResizeButton;
private ImageView mImageViewForGallery;
private ImageView mImageVIewForDrable;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_third);
mGetImageButton = (Button) findViewById(R.id.button_getImage);
mGetImageButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// SET action AND miniType
Intent intent = new Intent();
intent.setAction(Intent.ACTION_PICK);
intent.setType("image/*");
// REQUEST Uri of image
startActivityForResult(intent, REQUEST_IMAGE);
}
});
mResizeButton = (Button) findViewById(R.id.button_resize);
mResizeButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
resize();
}
});
mImageViewForGallery = (ImageView) findViewById(R.id.imageView);
mImageVIewForDrable = (ImageView) findViewById(R.id.imageViewFromDrable);
mImageVIewForDrable.setImageDrawable(getResources().getDrawable(R.drawable.ic_launcher));
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode != Activity.RESULT_OK) {return;}
if (requestCode == REQUEST_IMAGE) {
Uri uri = data.getData();
// SET image
mImageViewForGallery.setImageURI(uri);
Drawable drawable = mImageViewForGallery.getDrawable();
Log.e("asd", "Height:" + drawable.getIntrinsicHeight());
Log.e("asd", "Width:" + drawable.getIntrinsicWidth());
}
}
private void resize() {
if (mImageViewForGallery.getDrawable() != null) {
bitmapToResize = drawableToBitmap(mImageVIewForDrable.getDrawable());
int width = mImageViewForGallery.getDrawable().getIntrinsicWidth();
int height = mImageViewForGallery.getDrawable().getIntrinsicHeight();
bitmapToResize = zoomBitmap(bitmapToResize, width, height);
mImageVIewForDrable.setImageBitmap(bitmapToResize);
} else {
Log.e("asd", "setImageFirst");
}
}
public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
Matrix matrix = new Matrix();
float scaleWidht = ((float) w / width);
float scaleHeight = ((float) h / height);
matrix.postScale(scaleWidht, scaleHeight);
Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height,
matrix, true);
return newbmp;
}
public static Bitmap drawableToBitmap(Drawable drawable) {
int width = drawable.getIntrinsicWidth();
int height = drawable.getIntrinsicHeight();
Bitmap bitmap = Bitmap.createBitmap(width, height, drawable
.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
: Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, width, height);
drawable.draw(canvas);
return bitmap;
}
}
activity_third.xml: activity_third.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
android:background="@android:color/darker_gray"
tools:context="com.ch.summerrunner.ThirdActivity">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/darker_gray">
<Button
android:id="@+id/button_getImage"
android:text="@string/gallery"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="@+id/button_resize"
android:text="@string/resize"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="16dp"
android:layout_toRightOf="@id/button_getImage"/>
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:background="@android:color/white"
android:layout_below="@id/button_getImage"/>
<ImageView
android:id="@+id/imageViewFromDrable"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@android:color/white"
android:layout_below="@id/imageView"/>
</RelativeLayout>
</ScrollView>
</RelativeLayout>
Bitmap bmpIn = BitmapFactory.decodeResource(view.getResources(), R.drawable.image);
BitMap bmpOut = Bitmap.createScaledBitmap(bmpIn, width, height, false);
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