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程式碼下載

 

package com.qsa;

 

import android.app.Activity;
import android.graphics.Matrix;

import android.graphics.PointF;
import android.os.Bundle;
import android.os.Handler;
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.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageView;

public class ShowPic extends Activity implements OnTouchListener,
  OnClickListener {
 /** Called when the activity is first created. */

 private static final String TAG = "Touch";
 Matrix matrix = new Matrix();
 Matrix saveMatrix = new Matrix();

 static final int NONE = 0;
 static final int DRAG = 1;
 static final int ZOOM = 2;
 int mode = NONE;
 private Animation myAnimation_Alpha;
 PointF start = new PointF();
 PointF mid = new PointF();
 float oldDist = 1f;
 View btn;
 ImageView view;
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  this.requestWindowFeature(Window.FEATURE_NO_TITLE);
  getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
    WindowManager.LayoutParams.FLAG_FULLSCREEN);

  setContentView(R.layout.show);
  view= (ImageView) findViewById(R.id.imageView);
  view.setOnTouchListener(this);
  btn = findViewById(R.id.button1);
  btn.setOnClickListener(this);
 }

 @Override
 public void onClick(View v) {
  // TODO Auto-generated method stub
  switch (v.getId()) {
  case R.id.button1:
   //myAnimation_Alpha = AnimationUtils.loadAnimation(this,R.anim.hold);
   //view.startAnimation(myAnimation_Alpha);
   
   finish();
  
   break;

  default:
   break;
  }
 }

 @Override
 public boolean onTouch(View v, MotionEvent event) {
  // TODO Auto-generated method stub

  ImageView view = (ImageView) v;

  dumpEvent(event);
  switch (event.getAction() & MotionEvent.ACTION_MASK) {
  case MotionEvent.ACTION_DOWN:
   saveMatrix.set(matrix);
   start.set(event.getX(), event.getY());
   Log.d(TAG, "mode=DRAG");
   mode = DRAG;
   break;
  case MotionEvent.ACTION_UP:
  case MotionEvent.ACTION_POINTER_UP:
   mode = NONE;
   Log.d(TAG, "mode=NONE");
   break;
  case MotionEvent.ACTION_MOVE:
   if (mode == DRAG) {
    matrix.set(saveMatrix);
    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(saveMatrix);
     float scale = newDist / oldDist;
     matrix.postScale(scale, scale, mid.x, mid.y);
    }

   }

   break;
  case MotionEvent.ACTION_POINTER_DOWN:
   oldDist = spacing(event);
   Log.d(TAG, "oldDIst=" + oldDist);

   if (oldDist > 10f) {
    saveMatrix.set(matrix);
    midPoint(mid, event);
    mode = ZOOM;
    Log.d(TAG, "mode=ZOOM");
   }
   break;

  }
  view.setImageMatrix(matrix);

  return true;
 }

 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(TAG, sb.toString());
 }

 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);
 }

}

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