public class ShowImgsActivity extends Activity implements OnTouchListener{
int imagesArray[]={R.drawable.a1,R.drawable.a2,R.drawable.a3};
private ImageView img;
private List<String> sd;
float x1,x2;
float y1, y2;
private String[] files;
private AssetManager assetManager;
private int possition;
static int forwarInt=1;
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;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.showimgsscreen);
init();
}
private void init() {
img=(ImageView) findViewById(R.id.img_prev);
assetManager =ShowImgsActivity.this.getAssets();
possition=getIntent().getIntExtra("Main_position",0);
try {
files = assetManager.list("Deaf/0"+possition);
getImage(getApplicationContext(), "Deaf/0"+possition, 0);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
forwarInt=0;
}
private void getImage(Context conetx,String folderName,int pos) throws IOException
{
if(pos<=files.length-1 && pos>=0)
{
Bitmap bmp;
bmp = BitmapFactory.decodeStream(assetManager.open(folderName+"/"
+ files[pos]));
img.setImageBitmap(bmp);
img.setOnTouchListener(this);
}else if (pos>files.length-1) {
forwarInt=files.length-1;
Toast.makeText(getApplicationContext(), "move backward", Toast.LENGTH_SHORT).show();
}
else if (pos<0) {
forwarInt=0;
Toast.makeText(getApplicationContext(), "move forward", Toast.LENGTH_SHORT).show();
}
else{
Log.e("_____________", "less greater");
}
}
@Override
public boolean onTouchEvent(MotionEvent touchevent) {
// touch=true;
switch (touchevent.getAction())
{
// when user first touches the screen we get x and y coordinate
case MotionEvent.ACTION_DOWN:
{
x1 = touchevent.getX();
y1 = touchevent.getY();
break;
}
case MotionEvent.ACTION_UP:
{
x2 = touchevent.getX();
y2 = touchevent.getY();
//if left to right sweep event on screen
if (x1 < x2)
{
forwarInt++;
Toast.makeText(this, "Left to Right Swap Performed", Toast.LENGTH_SHORT).show();
try {
getImage(getApplicationContext(), "Deaf/0"+possition, forwarInt);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// if right to left sweep event on screen
if (x1 > x2)
{
forwarInt--;
Toast.makeText(this, "Right to Left Swap Performed", Toast.LENGTH_SHORT).show();
try {
getImage(getApplicationContext(), "Deaf/0"+possition, forwarInt);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// if UP to Down sweep event on screen
if (y1 < y2)
{
// Toast.makeText(this, "UP to Down Swap Performed", Toast.LENGTH_LONG).show();
}
//if Down to UP sweep event on screen
if (y1 > y2)
{
// Toast.makeText(this, "Down to UP Swap Performed", Toast.LENGTH_LONG).show();
}
break;
}
}
return false;
}
@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());
}
}
我有资产文件夹中可用的图像。我已经在图像上应用了滑动现在我想对每个图像应用缩放。但是当我应用缩放功能时，滑动功能无法工作。