如何在位图上制作触摸事件我在我的视图中获得触摸事件这是我的代码。请检查我在Bitmap resizedBitmap 上进行触摸事件的操作。在这个位图对象中，我从drawable文件夹接收图像并在图像视图上设置murge请帮助我。
import android.app.Activity;
import android.content.Intent;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ImageView;
public class SingleImageView extends Activity implements OnTouchListener{
public static Bitmap Murge_Bitmap , Bitmap_recieve , bitmap1;
ImageAdapter myImageAdapter;
ImageView imageview;
Button A4_Button ;
Bitmap bitmap ,resizedBitmap;
private static final String TAG = "Touch";
@SuppressWarnings("unused")
private static final float MIN_ZOOM = 1f, MAX_ZOOM = 1f;
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;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.single_image_view);
A4_Button = (Button)findViewById(R.id.Make_A4_sheet);
imageview = (ImageView)findViewById(R.id.imageviewforsingleimage1);
Bitmap_recieve = BitmapFactory.decodeByteArray(getIntent().getByteArrayExtra("byteArray"),0,getIntent()
.getByteArrayExtra("byteArray").length);
murge();
imageview.setImageBitmap(Murge_Bitmap);
imageview.setOnTouchListener(this);
A4_Button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Intent i = new Intent(SingleImageView.this, A4Copy.class);
startActivity(i);
}
});
}
protected Bitmap murge()
{
Murge_Bitmap = null;
Murge_Bitmap = Bitmap.createBitmap(600, 600, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(Murge_Bitmap);
Resources res = getResources();
bitmap1 = BitmapFactory.decodeResource(res, R.drawable.sample_pic);
resizedBitmap=Bitmap.createScaledBitmap(bitmap1, 600, 600, true);
Drawable drawable1 = new BitmapDrawable(Bitmap_recieve);
Drawable drawable2 = new BitmapDrawable( resizedBitmap);
//c.drawBitmap(Murge_Bitmap, 500,500, null);
drawable1.setBounds(200, 200, 400, 400);
drawable2.setBounds(200, 240, 400, 400);
drawable1.draw(c);
drawable2.draw(c);
return Murge_Bitmap;
}
@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:
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
Log.d(TAG, "mode=NONE");
break;
case MotionEvent.ACTION_POINTER_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;
}
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);
}
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);
}
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 Event", sb.toString());
}
}