我正在尝试为图像添加缩放选项，我已经购买了图像视图。实际上，图像视图工作正常，代码正在运行，没有任何错误或问题。在缩放我的图像视图期间，它不会缩放。我的代码如下。
ZoomInZoomOut.java
import android.app.Activity;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.os.Bundle;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
public class ZoomInZoomOut extends Activity implements OnTouchListener
{
private static final String TAG = "Touch";
@SuppressWarnings("unused")
private static final float MIN_ZOOM = 1f,MAX_ZOOM = 1f;
// These matrices will be used to scale points of the image
Matrix matrix = new Matrix();
Matrix savedMatrix = new Matrix();
// The 3 states (events) which the user is trying to perform
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;
// these PointF objects are used to record the point(s) the user is touching
PointF start = new PointF();
PointF mid = new PointF();
float oldDist = 1f;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fullscreen_image);
ImageView view = (ImageView) findViewById(R.id.imgFullscreen);
view.setOnTouchListener(this);
}
@Override
public boolean onTouch(View v, MotionEvent event)
{
ImageView view = (ImageView) v;
view.setScaleType(ImageView.ScaleType.MATRIX);
float scale;
dumpEvent(event);
// Handle touch events here...
switch (event.getAction() & MotionEvent.ACTION_MASK)
{
case MotionEvent.ACTION_DOWN: // first finger down only
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
Log.d(TAG, "mode=DRAG"); // write to LogCat
mode = DRAG;
break;
case MotionEvent.ACTION_UP: // first finger lifted
case MotionEvent.ACTION_POINTER_UP: // second finger lifted
mode = NONE;
Log.d(TAG, "mode=NONE");
break;
case MotionEvent.ACTION_POINTER_DOWN: // first and second finger down
oldDist = spacing(event);
Log.d(TAG, "oldDist=" + oldDist);
if (oldDist > 5f) {
savedMatrix.set(matrix);
midPoint(mid, event);
mode = ZOOM;
Log.d(TAG, "mode=ZOOM");
}
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG)
{
matrix.set(savedMatrix);
matrix.postTranslate(event.getX() - start.x, event.getY() - start.y); // create the transformation in the matrix of points
}
else if (mode == ZOOM)
{
// pinch zooming
float newDist = spacing(event);
Log.d(TAG, "newDist=" + newDist);
if (newDist > 5f)
{
matrix.set(savedMatrix);
scale = newDist / oldDist; // setting the scaling of the
// matrix...if scale > 1 means
// zoom in...if scale < 1 means
// zoom out
matrix.postScale(scale, scale, mid.x, mid.y);
}
}
break;
}
view.setImageMatrix(matrix); // display the transformation on screen
return true; // indicate event was handled
}
/*
* --------------------------------------------------------------------------
* Method: spacing Parameters: MotionEvent Returns: float Description:
* checks the spacing between the two fingers on touch
* ----------------------------------------------------
*/
private float spacing(MotionEvent event)
{
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return FloatMath.sqrt(x * x + y * y);
}
/*
* --------------------------------------------------------------------------
* Method: midPoint Parameters: PointF object, MotionEvent Returns: void
* Description: calculates the midpoint between the two fingers
* ------------------------------------------------------------
*/
private void midPoint(PointF point, MotionEvent event)
{
float x = event.getX(0) + event.getX(1);
float y = event.getY(0) + event.getY(1);
point.set(x / 2, y / 2);
}
/** Show an event in the LogCat view, for debugging */
private void dumpEvent(MotionEvent event)
{
String names[] = { "DOWN", "UP", "MOVE", "CANCEL", "OUTSIDE","POINTER_DOWN", "POINTER_UP", "7?", "8?", "9?" };
StringBuilder sb = new StringBuilder();
int action = event.getAction();
int actionCode = action & MotionEvent.ACTION_MASK;
sb.append("event ACTION_").append(names[actionCode]);
if (actionCode == MotionEvent.ACTION_POINTER_DOWN || actionCode == MotionEvent.ACTION_POINTER_UP)
{
sb.append("(pid ").append(action >> MotionEvent.ACTION_POINTER_ID_SHIFT);
sb.append(")");
}
sb.append("[");
for (int i = 0; i < event.getPointerCount(); i++)
{
sb.append("#").append(i);
sb.append("(pid ").append(event.getPointerId(i));
sb.append(")=").append((int) event.getX(i));
sb.append(",").append((int) event.getY(i));
if (i + 1 < event.getPointerCount())
sb.append(";");
}
sb.append("]");
Log.d("Touch Events ---------", sb.toString());
}
activity_fullscreen_image.xml也如下
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/black" >
<ProgressBar
android:id="@+id/pbLoader"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true" >
</ProgressBar>
<com.google.android.gms.ads.AdView
android:id="@+id/adView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="false"
ads:adSize="BANNER"
ads:adUnitId="@string/banner_ad_unit_id"
>
</com.google.android.gms.ads.AdView>
<!-- Scroll view for fullscreen preview -->
<HorizontalScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="horizontal" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:weightSum="1">
<ImageView
android:id="@+id/imgFullscreen"
android:layout_width="384dp"
android:layout_height="288dp"
android:layout_gravity="center_vertical" />
<!-- android:scaleType="fitXY" /> -->
</LinearLayout>
</HorizontalScrollView>
<!-- Set as Set wallpaper button -->
<!-- Set as Share button -->
<!-- Download wallpaper button -->
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/frameLayout"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_marginBottom="28dp">
<LinearLayout
android:id="@+id/btShare"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/btn_rounded_corner"
android:orientation="horizontal"
android:layout_alignWithParentIfMissing="false"
android:baselineAligned="false"
android:layout_alignTop="@+id/llSetWallpaper"
android:layout_alignParentLeft="true"
android:layout_gravity="left|bottom">
<ImageView
android:layout_width="22dp"
android:layout_height="22dp"
android:src="@drawable/common_signin_btn_icon_light" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:text="@string/Share"
android:textColor="@color/white"
android:textSize="18dp" />
</LinearLayout>
<LinearLayout
android:id="@+id/llSetWallpaper"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/btn_rounded_corner"
android:orientation="horizontal"
android:layout_alignTop="@+id/llDownloadWallpaper"
android:layout_alignRight="@+id/pbLoader"
android:layout_alignParentBottom="false"
android:layout_centerVertical="true"
android:layout_gravity="center_horizontal|bottom">
<ImageView
android:layout_width="21dp"
android:layout_height="21dp"
android:src="@drawable/ico_apply" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:text="@string/set_wallpaper"
android:textColor="@color/white"
android:textSize="18dp" />
</LinearLayout>
</FrameLayout>
<LinearLayout
android:id="@+id/llDownloadWallpaper"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/btn_rounded_corner"
android:gravity="center_vertical"
android:orientation="horizontal"
android:layout_gravity="right|bottom"
android:layout_alignBottom="@+id/frameLayout"
android:layout_alignParentRight="true">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:text="@string/download_wallpaper"
android:textColor="@color/white"
android:textSize="18dp" />
</LinearLayout>
</RelativeLayout>
任何建议？
答案 0 :(得分：0)
我已经工作了大约两天，最后得到了这个解决方案。在ImageView上设置Bitmap后调用此方法
public void usingSimpleImage(ImageView imageView) {
ImageAttacher mAttacher = new ImageAttacher(imageView);
ImageAttacher.MAX_ZOOM = 2.0f; // Double the current Size
ImageAttacher.MIN_ZOOM = 0.5f; // Half the current Size
MatrixChangeListener mMaListener = new MatrixChangeListener();
mAttacher.setOnMatrixChangeListener(mMaListener);
PhotoTapListener mPhotoTap = new PhotoTapListener();
mAttacher.setOnPhotoTapListener(mPhotoTap);
}
private class PhotoTapListener implements OnPhotoTapListener {
@Override
public void onPhotoTap(View view, float x, float y) {
}
}
private class MatrixChangeListener implements OnMatrixChangedListener {
@Override
public void onMatrixChanged(RectF rect) {
}
}
愿这对你有帮助，这对我有用。