可绘图文件夹中的ImageUri
我一直在按照本教程学习如何在我正在开发的应用程序中实现缩放和平移功能。可绘图文件夹中的ImageUri,image,uri,zooming,drawable,pan,Image,Uri,Zooming,Drawable,Pan,我一直在按照本教程学习如何在我正在开发的应用程序中实现缩放和平移功能。 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/container" android:layout_width="match_parent" android:layout_height="m
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="mobapptut.com.imageviewer.ImageViewMainActivity">
<ImageView
android:layout_width="200dp"
android:layout_height="150dp"
android:id="@+id/imageView"
android:layout_centerInParent="true" />
<mobapptut.com.imageviewer.PinchZoomImageView
android:visibility="invisible"
android:id="@+id/pinchZoomImageView"
android:layout_centerInParent="true"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="mobapptut.com.imageviewer.ImageViewMainActivity">
<ImageView
android:layout_width="200dp"
android:layout_height="150dp"
android:id="@+id/imageView"
android:layout_centerInParent="true" />
<mobapptut.com.imageviewer.PinchZoomImageView
android:visibility="invisible"
android:id="@+id/pinchZoomImageView"
android:layout_centerInParent="true"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="mobapptut.com.imageviewer.ImageViewMainActivity">
<ImageView
android:layout_width="200dp"
android:layout_height="150dp"
android:id="@+id/imageView"
android:layout_centerInParent="true" />
<mobapptut.com.imageviewer.PinchZoomImageView
android:visibility="invisible"
android:id="@+id/pinchZoomImageView"
android:layout_centerInParent="true"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
首先，它打开了一个画廊。然后选择要显示的图像，并将其显示为mImageView中的缩略图。 长时间单击后，它将隐藏mImageView，并在第二个图像视图内显示最大化的图像。（MPinchZoomImageView）
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="mobapptut.com.imageviewer.ImageViewMainActivity">
<ImageView
android:layout_width="200dp"
android:layout_height="150dp"
android:id="@+id/imageView"
android:layout_centerInParent="true" />
<mobapptut.com.imageviewer.PinchZoomImageView
android:visibility="invisible"
android:id="@+id/pinchZoomImageView"
android:layout_centerInParent="true"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="mobapptut.com.imageviewer.ImageViewMainActivity">
<ImageView
android:layout_width="200dp"
android:layout_height="150dp"
android:id="@+id/imageView"
android:layout_centerInParent="true" />
<mobapptut.com.imageviewer.PinchZoomImageView
android:visibility="invisible"
android:id="@+id/pinchZoomImageView"
android:layout_centerInParent="true"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="mobapptut.com.imageviewer.ImageViewMainActivity">
<ImageView
android:layout_width="200dp"
android:layout_height="150dp"
android:id="@+id/imageView"
android:layout_centerInParent="true" />
<mobapptut.com.imageviewer.PinchZoomImageView
android:visibility="invisible"
android:id="@+id/pinchZoomImageView"
android:layout_centerInParent="true"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="mobapptut.com.imageviewer.ImageViewMainActivity">
<ImageView
android:layout_width="200dp"
android:layout_height="150dp"
android:id="@+id/imageView"
android:layout_centerInParent="true" />
<mobapptut.com.imageviewer.PinchZoomImageView
android:visibility="invisible"
android:id="@+id/pinchZoomImageView"
android:layout_centerInParent="true"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
public class ImageViewMainActivity extends AppCompatActivity {
ImageView mImageView;
PinchZoomImageView mPinchZoomImageView;
private Uri mImageUri;
private static final int REQUEST_OPEN_RESULT_CODE = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image_view_main);
mImageView = (ImageView) findViewById(R.id.imageView);
mPinchZoomImageView = (PinchZoomImageView) findViewById(R.id.pinchZoomImageView);
mImageView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
pinchZoomPan();
return true;
}
});
Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("image/*");
startActivityForResult(intent, REQUEST_OPEN_RESULT_CODE); // pass it a context of 0
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
View decorView = getWindow().getDecorView();
if(hasFocus) {
decorView.setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
| View.SYSTEM_UI_FLAG_FULLSCREEN
| View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
);
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent resultData) {
if(requestCode == REQUEST_OPEN_RESULT_CODE && resultCode == RESULT_OK) {
if(resultData != null) {
mImageUri = resultData.getData();
Glide.with(this)
.load(mImageUri)
.into(mImageView);
}
}
}
private void pinchZoomPan() {
mPinchZoomImageView.setImageUri(mImageUri);
mImageView.setAlpha(0.f); // set mImageView invisible.
mPinchZoomImageView.setVisibility(View.VISIBLE);
}
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="mobapptut.com.imageviewer.ImageViewMainActivity">
<ImageView
android:layout_width="200dp"
android:layout_height="150dp"
android:id="@+id/imageView"
android:layout_centerInParent="true" />
<mobapptut.com.imageviewer.PinchZoomImageView
android:visibility="invisible"
android:id="@+id/pinchZoomImageView"
android:layout_centerInParent="true"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
public class PinchZoomImageView extends ImageView {
private Bitmap mBitmap;
private int mImageWidth;
private int mImageHeight;
private final static float mMinZoom = 1.f;
private final static float mMaxZoom = 4.f;
private float mScaleFactor = 1.f;
private ScaleGestureDetector mScaleGestureDetector;
private final static int NONE = 0;
private final static int PAN = 1;
private final static int ZOOM = 2;
private int mEventState;
private float mStartX = 0;
private float mStartY = 0;
private float mTranslateX = 0;
private float mTranslateY = 0;
private float mPreviousTranslateX = 0;
private float mPreviousTranslateY = 0;
private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScale(ScaleGestureDetector detector) {
mScaleFactor *= detector.getScaleFactor();
mScaleFactor = Math.max(mMinZoom, Math.min(mMaxZoom, mScaleFactor));
// invalidate();
// requestLayout();
return super.onScale(detector);
}
}
public PinchZoomImageView(Context context, AttributeSet attrs) {
super(context, attrs);
mScaleGestureDetector = new ScaleGestureDetector(getContext(), new ScaleListener());
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch(event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
mEventState = PAN;
mStartX = event.getX() - mPreviousTranslateX;
mStartY = event.getY() - mPreviousTranslateY;
break;
case MotionEvent.ACTION_UP:
mEventState = NONE;
mPreviousTranslateX = mTranslateX;
mPreviousTranslateY = mTranslateY;
break;
case MotionEvent.ACTION_MOVE:
mTranslateX = event.getX() - mStartX;
mTranslateY = event.getY() - mStartY;
break;
case MotionEvent.ACTION_POINTER_DOWN:
mEventState = ZOOM;
break;
}
mScaleGestureDetector.onTouchEvent(event);
if((mEventState == PAN && mScaleFactor != mMinZoom) || mEventState == ZOOM) { // called under the condition that window is zoomed i
invalidate();
requestLayout();
}
return true;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int imageWidth = MeasureSpec.getSize(widthMeasureSpec);
int imageHeight = MeasureSpec.getSize(heightMeasureSpec);
int scaledWidth = Math.round(mImageWidth * mScaleFactor);
int scaledHeight = Math.round(mImageHeight * mScaleFactor);
setMeasuredDimension(
Math.min(imageWidth, scaledWidth),
Math.min(imageHeight, scaledHeight)
);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.save();
canvas.scale(mScaleFactor, mScaleFactor);
// canvas.scale(mScaleFactor, mScaleFactor, mScaleGestureDetector.getFocusX(), mScaleGestureDetector.getFocusY());
if((mTranslateX * -1) < 0) {
mTranslateX = 0;
} else if ((mTranslateX * -1) > mImageWidth * mScaleFactor - getWidth()) {
mTranslateX = (mImageWidth * mScaleFactor - getWidth()) * -1;
}
if((mTranslateY * -1) < 0) {
mTranslateY = 0;
} else if ((mTranslateY * -1) > mImageHeight * mScaleFactor - getHeight()) {
mTranslateY = (mImageHeight * mScaleFactor - getHeight()) * -1;
}
canvas.translate(mTranslateX/mScaleFactor, mTranslateY/mScaleFactor);
canvas.drawBitmap(mBitmap, 0, 0, null);
canvas.restore();
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
}
public void setImageUri(Uri uri) {
try {
Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContext().getContentResolver(), uri);
float aspecRatio = (float) bitmap.getHeight() / (float) bitmap.getWidth();
DisplayMetrics displayMetrics = getResources().getDisplayMetrics();
mImageWidth = displayMetrics.widthPixels;
mImageHeight = Math.round(mImageWidth * aspecRatio);
mBitmap = Bitmap.createScaledBitmap(bitmap, mImageWidth, mImageHeight, false);
invalidate();
requestLayout();
} catch (IOException e) {
e.printStackTrace();
}
}
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="mobapptut.com.imageviewer.ImageViewMainActivity">
<ImageView
android:layout_width="200dp"
android:layout_height="150dp"
android:id="@+id/imageView"
android:layout_centerInParent="true" />
<mobapptut.com.imageviewer.PinchZoomImageView
android:visibility="invisible"
android:id="@+id/pinchZoomImageView"
android:layout_centerInParent="true"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
公共类PinchZoomImageView扩展了ImageView{
私有位图mBitmap；
私有整数图像宽度；
私人内部图像高度；
专用最终静态浮点数mMinZoom=1.f；
私有最终静态浮点mMaxZoom=4.f；
私人浮动mScaleFactor=1.f；
专用标尺检测器mScaleGestureDetector；
私有最终静态int NONE=0；
私有最终静态int PAN=1；
私有最终静态整数缩放=2；
梅文茨塔特私人酒店；
私有浮点mStartX=0；
私有浮点数mStartY=0；
私有浮动MTRANSE=0；
私有浮动mTranslateY=0；
私有浮点MPPreviousTranslateX=0；
私有浮点MPPreviousTranslateY=0；
私有类ScaleListener扩展了ScaleGetStereDetector.SimpleOnScaleGetStereListener{
@凌驾
公共布尔标度（scalegestruedetector检测器）{
mScaleFactor*=detector.getScaleFactor（）；
mScaleFactor=Math.max（mMinZoom，Math.min（mMaxZoom，mScaleFactor））；
//使无效（）；
//requestLayout（）；
返回超刻度（探测器）；
}
}
公共PinchZoomImageView（上下文上下文，属性集属性）{
超级（上下文，attrs）；
mScaleGestureDetector=newscalegesturedtector（getContext（），newscaleListener（））；
}
@凌驾
公共布尔onTouchEvent（运动事件）{