Hi all,
I have followed the example of using multi touch which can be found
here..http://www.zdnet.com/blog/burnette/how-to-use-multi-touch-in-
android-2/1747?tag=mantle_skin;content
I am pretty sure I have included, in my code, all of the required
elements but, although the dumpEvent log shows that my touch gestures
are being picked up, and accurately, I can't move my picture around or
zoom in.
The only difference I can see is that my picture is loaded from the SD
card whereas in the example the picture is a drawable...
Here is my code
package com.pengilleys.fishingsnapz;
import java.io.FileNotFoundException;
import java.io.IOException;
import android.app.Activity;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.ContentResolver;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.provider.MediaStore;
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 ImagePreview extends Activity implements OnTouchListener{
static final int PROGRESS_DIALOG = 0;
ProgressDialog progressDialog;
private Bundle extras;
protected static Bitmap bm;
protected DBAdapter db = new DBAdapter(ImagePreview.this);
Long id;
GetHandler handler = new GetHandler();
//Touch gesture related variables
Matrix matrix = new Matrix();
Matrix savedMatrix = new Matrix();
// Remember some things for zooming
PointF start = new PointF();
PointF mid = new PointF();
float oldDist = 0;
// We can be in one of these 3 states
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.image_view);
try{
getImage();
//start a progressdialog
showDialog(PROGRESS_DIALOG);
extras = getIntent().getExtras();
id = (Long) extras.get(DBAdapter.KEY_ROWID);
db.open();
bm = getImage();
//Log.e("ONCREATE","setImageBitmap="+bm.toString());
ImageView imageV =
(ImageView)findViewById(R.id.image_preview);
imageV.setOnTouchListener(this);
imageV.setImageBitmap(bm);
dismissDialog(PROGRESS_DIALOG);
}catch(Exception e){
Log.e("ONCREATE",e.toString());
}finally{
db.close();
}
}
//setup the progressdialog
protected Dialog onCreateDialog(int id) {
switch(id) {
case PROGRESS_DIALOG:
try{
progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Loading snap...");
progressDialog.setOwnerActivity(this);
return progressDialog;
}catch(Exception e){
Log.e("ONCREATEDIALOG",e.toString());
}
default:
return null;
}
}
private class GetHandler extends Handler{
public void handleMessage(Message message){
ImagePreview.this.getImage();
}
}
public Bitmap getImage(){
try {
Uri uri=null;
Cursor c = db.fetchUri(id);
uri =
Uri.parse(c.getString(c.getColumnIndexOrThrow(DBAdapter.KEY_URI)));
ContentResolver cr = getContentResolver();
Bitmap bitmap =
MediaStore.Images.Media.getBitmap(cr,uri);
return bitmap;
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
Log.e("GETIMAGE",e.toString());
return null;
} catch (IOException e) {
// TODO Auto-generated catch block
Log.e("GETIMAGE",e.toString());
return null;
}catch(Exception e){
Log.e("GETIMAGE",e.toString());
return null;
}
};
@Override
public boolean onTouch(View v, MotionEvent event) {
final String TAG = "Touch";
// TODO Auto-generated method stub
ImageView view = (ImageView) v;
dumpEvent(event);
switch(event.getAction() & MotionEvent.ACTION_MASK){
case MotionEvent.ACTION_DOWN:
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
Log.d(TAG,"mode=DRAG");
mode=DRAG;
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_DOWN:
oldDist=spacing(event);
Log.d(TAG, "oldDist=" + oldDist);
if(oldDist>10f){
savedMatrix.set(matrix);
midPoint(mid,event);
mode=ZOOM;
Log.d(TAG,"mode=ZOOM");
}
break;
case MotionEvent.ACTION_MOVE:
if(mode==DRAG){
Log.d(TAG,"mode=MOVE");
matrix.set(savedMatrix);
matrix.postTranslate(event.getX() -
start.x,event.getY()-start.y);
}else if(mode==ZOOM){
float newDist= spacing(event);
Log.d(TAG, "newDist=" + newDist);
if(newDist>10f){
matrix.set(savedMatrix);
float scale = newDist / oldDist;
matrix.postScale(scale, scale, mid.x,
mid.y);
}
}
break;
}
//perform the transformation
view.setImageMatrix(matrix);
return true;
}
private static 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);
}
private static 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("DUMP", sb.toString());
}
}
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