Android 我想在中心裁剪后将图像缩放到底部
我使用图像视图显示客户的图片,并使用此命令在图像视图中缩放图像Android 我想在中心裁剪后将图像缩放到底部,android,image,Android,Image,我使用图像视图显示客户的图片,并使用此命令在图像视图中缩放图像 iv.setScaleType(ImageView.ScaleType.CENTER_CROP); 但在执行此命令后,客户的头部已被部分切割,因此我希望在执行“中心裁剪”命令后将图像缩放为按钮,以便图像底部将被切割没有现成的解决方案满足您的要求。 您需要自己进行缩放。以下是您的操作方法: @Override protected void onCreate(Bundle savedInstanceState) {
iv.setScaleType(ImageView.ScaleType.CENTER_CROP);
但在执行此命令后,客户的头部已被部分切割,因此我希望在执行“中心裁剪”命令后将图像缩放为按钮,以便图像底部将被切割没有现成的解决方案满足您的要求。 您需要自己进行缩放。以下是您的操作方法:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// we need to wait till the layout has been inflated to get the size of the ImageView
final ImageView iv = (ImageView) findViewById(R.id.image);
iv.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
scaleBitmap(iv);
}
}
);
}
private void scaleBitmap(ImageView iv) {
// get ImageView and determine width & height
int imageWidth = iv.getWidth();
int imageHeight = iv.getHeight();
Rect imageRect = new Rect(0, 0, imageWidth, imageHeight);
// determine destination rectangle
BitmapDrawable drawable = (BitmapDrawable)iv.getDrawable();
Bitmap sourceBitmap = drawable.getBitmap();
Rect bitmapRect = new Rect(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
// determine source rectangle
Rect sourceRect = computeSourceRect(imageRect, bitmapRect);
// here's where we do the magic
Bitmap scaledBitmap = Bitmap.createBitmap(imageRect.width(), imageRect.height(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(scaledBitmap);
canvas.drawBitmap(sourceBitmap, sourceRect, imageRect, new Paint());
iv.setImageBitmap(scaledBitmap);
}
private Rect computeSourceRect(Rect imageRect, Rect bitmapRect) {
float imageWidth = (float) imageRect.width();
float imageHeight = (float) imageRect.height();
float bitmapWidth = (float) bitmapRect.width();
float bitmapHeight = (float) bitmapRect.height();
float aspectRatioImage = imageWidth / imageHeight;
float aspectRatioBitmap = bitmapWidth / bitmapHeight;
if (aspectRatioImage<aspectRatioBitmap) {
float newWidth = bitmapHeight * aspectRatioImage;
float widthOffset = (bitmapWidth - newWidth) / 2f;
return new Rect((int) widthOffset, 0, (int) (widthOffset + newWidth), (int) bitmapHeight);
}
else {
float newHeight = bitmapWidth / aspectRatioImage;
float heightOffset = (bitmapHeight - newHeight) / 2f;
// return this for center_crop
//return new Rect(0, (int) heightOffset, (int) bitmapWidth, (int) (heightOffset + newHeight));
// return this for bottom align
return new Rect(0, 0, (int) bitmapWidth, (int) newHeight);
}
}
@覆盖
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//我们需要等到布局膨胀后才能得到ImageView的大小
最终ImageView iv=(ImageView)findViewById(R.id.image);
iv.getViewTreeObserver().addOnGlobalLayoutListener(新OnGlobalLayoutListener()){
@凌驾
公共图书馆{
scaleBitmap(iv);
}
}
);
}
私有void scaleBitmap(ImageView iv){
//获取ImageView并确定宽度和高度
int imageWidth=iv.getWidth();
int imageHeight=iv.getHeight();
Rect-imageRect=新的Rect(0,0,imageWidth,imageHeight);
//确定目标矩形
BitmapDrawable drawable=(BitmapDrawable)iv.getDrawable();
位图sourceBitmap=drawable.getBitmap();
Rect bitmapRect=new Rect(0,0,drawable.getIntrinsicWidth(),drawable.getIntrinsicHeight());
//确定源矩形
Rect sourceRect=computeSourceRect(imageRect,bitmapRect);
//这是我们施展魔法的地方
位图缩放位图=Bitmap.createBitmap(imageRect.width()、imageRect.height()、Bitmap.Config.ARGB_8888);
画布画布=新画布(缩放位图);
drawBitmap(sourceBitmap、sourceRect、imageRect、new Paint());
iv.设置图像位图(缩放位图);
}
私有Rect computeSourceRect(Rect imageRect,Rect bitmapRect){
float imageWidth=(float)imageRect.width();
float imageHeight=(float)imageRect.height();
float bitmapWidth=(float)bitmapRect.width();
float bitmapHeight=(float)bitmapRect.height();
float aspectRatioImage=图像宽度/图像高度;
float aspectRatioBitmap=位图宽度/位图高度;
如果(aspectRatioImage没有现成的解决方案满足您的需求。
您需要自己进行缩放。以下是您的操作方法:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// we need to wait till the layout has been inflated to get the size of the ImageView
final ImageView iv = (ImageView) findViewById(R.id.image);
iv.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
scaleBitmap(iv);
}
}
);
}
private void scaleBitmap(ImageView iv) {
// get ImageView and determine width & height
int imageWidth = iv.getWidth();
int imageHeight = iv.getHeight();
Rect imageRect = new Rect(0, 0, imageWidth, imageHeight);
// determine destination rectangle
BitmapDrawable drawable = (BitmapDrawable)iv.getDrawable();
Bitmap sourceBitmap = drawable.getBitmap();
Rect bitmapRect = new Rect(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
// determine source rectangle
Rect sourceRect = computeSourceRect(imageRect, bitmapRect);
// here's where we do the magic
Bitmap scaledBitmap = Bitmap.createBitmap(imageRect.width(), imageRect.height(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(scaledBitmap);
canvas.drawBitmap(sourceBitmap, sourceRect, imageRect, new Paint());
iv.setImageBitmap(scaledBitmap);
}
private Rect computeSourceRect(Rect imageRect, Rect bitmapRect) {
float imageWidth = (float) imageRect.width();
float imageHeight = (float) imageRect.height();
float bitmapWidth = (float) bitmapRect.width();
float bitmapHeight = (float) bitmapRect.height();
float aspectRatioImage = imageWidth / imageHeight;
float aspectRatioBitmap = bitmapWidth / bitmapHeight;
if (aspectRatioImage<aspectRatioBitmap) {
float newWidth = bitmapHeight * aspectRatioImage;
float widthOffset = (bitmapWidth - newWidth) / 2f;
return new Rect((int) widthOffset, 0, (int) (widthOffset + newWidth), (int) bitmapHeight);
}
else {
float newHeight = bitmapWidth / aspectRatioImage;
float heightOffset = (bitmapHeight - newHeight) / 2f;
// return this for center_crop
//return new Rect(0, (int) heightOffset, (int) bitmapWidth, (int) (heightOffset + newHeight));
// return this for bottom align
return new Rect(0, 0, (int) bitmapWidth, (int) newHeight);
}
}
@覆盖
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//我们需要等到布局膨胀后才能得到ImageView的大小
最终ImageView iv=(ImageView)findViewById(R.id.image);
iv.getViewTreeObserver().addOnGlobalLayoutListener(新OnGlobalLayoutListener()){
@凌驾
公共图书馆{
scaleBitmap(iv);
}
}
);
}
私有void scaleBitmap(ImageView iv){
//获取ImageView并确定宽度和高度
int imageWidth=iv.getWidth();
int imageHeight=iv.getHeight();
Rect-imageRect=新的Rect(0,0,imageWidth,imageHeight);
//确定目标矩形
BitmapDrawable drawable=(BitmapDrawable)iv.getDrawable();
位图sourceBitmap=drawable.getBitmap();
Rect bitmapRect=new Rect(0,0,drawable.getIntrinsicWidth(),drawable.getIntrinsicHeight());
//确定源矩形
Rect sourceRect=computeSourceRect(imageRect,bitmapRect);
//这是我们施展魔法的地方
位图缩放位图=Bitmap.createBitmap(imageRect.width()、imageRect.height()、Bitmap.Config.ARGB_8888);
画布画布=新画布(缩放位图);
drawBitmap(sourceBitmap、sourceRect、imageRect、new Paint());
iv.设置图像位图(缩放位图);
}
私有Rect computeSourceRect(Rect imageRect,Rect bitmapRect){
float imageWidth=(float)imageRect.width();
float imageHeight=(float)imageRect.height();
float bitmapWidth=(float)bitmapRect.width();
float bitmapHeight=(float)bitmapRect.height();
float aspectRatioImage=图像宽度/图像高度;
float aspectRatioBitmap=位图宽度/位图高度;
如果(aspectRatioImage