另外一個的版本則是這個：MikeOrtiz / TouchImageView
WrapMotionEvent與EclairMotionEvent程式碼我就沒有放上來了，直接到第一個連結複製即可。
我這裡參考許多文章，在TouchImageView.java內增加了放大縮小、邊界判定。
package com.bear.myclass;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.util.DisplayMetrics;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageView;
@SuppressLint("ViewConstructor")
public class TouchImageView extends ImageView {
private static final String TAG = "Touch";
// These matrices will be used to move and zoom image
Matrix matrix = new Matrix();
Matrix savedMatrix = new Matrix();
// 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;
// Remember some things for zooming
PointF start = new PointF();
PointF mid = new PointF();
float oldDist = 1f;
Context context;
View parentView;
int frameWidth = 0;
int frameHeight = 0;
int bitmapWidth = 0;
int bitmapHeight = 0;
public int maxWidth = 0; //放大後最大可以寬到多少
public int minWidth = 0; //縮小後最小可以小到多少
float minScale = 0;
public TouchImageView(Context context, final View parentView) {
super(context);
// TODO 自動產生的建構子 Stub
super.setClickable(true);
this.context = context;
this.parentView = parentView;
this.setScaleType(ScaleType.MATRIX);
this.setOnTouchListener(imgOnTouchListener);
}
OnTouchListener imgOnTouchListener= new OnTouchListener(){
public boolean onTouch(View v, MotionEvent event) {
// Handle touch events here...
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
//Log.d(TAG, "TouchImage -- mode=DRAG");
mode = DRAG;
break;
case MotionEvent.ACTION_POINTER_DOWN:
oldDist = spacing(event);
//Log.d(TAG, "TouchImage -- oldDist=" + oldDist);
if (oldDist > 10f) {
savedMatrix.set(matrix);
midPoint(mid, event);
mode = ZOOM;
Log.d(TAG, "TouchImage -- mode=ZOOM");
}
break;
case MotionEvent.ACTION_UP:
//做最後確認
getRebuildMatrix();
mode = NONE;
Log.d(TAG, "TouchImage -- mode = NONE");
break;
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
Log.d(TAG, "TouchImage -- mode = NONE");
break;
case MotionEvent.ACTION_MOVE:
Matrix _m = new Matrix();
if (mode == DRAG) { // && getMatrixScale(matrix) > maxScale
// ...
float xx = event.getX() - start.x;
float yy =event.getY() - start.y;
_m.set(savedMatrix);
_m.postTranslate(xx, yy);
matrix.set(_m);
setImageMatrix(matrix);
} else if (mode == ZOOM) {
float newDist = spacing(event);
//Log.d(TAG, "TouchImage -- newDist=" + newDist);
if (newDist > 10f) {
float scale = newDist / oldDist;
_m.set(savedMatrix);
_m.postScale(scale, scale, mid.x, mid.y);
if (checkScale( _m,false)){
matrix.set(_m);
setImageMatrix(matrix);
}
}
}
break;
}
return true;
}
};
public void setImage(Bitmap bm, int displayWidth, int displayHeight) {
super.setImageBitmap(bm);
//Fit to screen.
frameWidth = displayWidth;
frameHeight = displayHeight;
bitmapWidth = bm.getWidth();
bitmapHeight = bm.getHeight();
savedMatrix.set(matrix);
matrix.set(savedMatrix);
float scale = setImageNormalScale(bm.getWidth(),bm.getHeight());
minScale = scale;
// Center the image
setCenterImage();
}
private float setImageNormalScale(int imageWidth, int imageHeight){
float scale;
if ((frameHeight / imageHeight) >= (frameWidth / imageWidth)){
scale = (float)frameWidth / (float)imageWidth;
} else {
scale = (float)frameHeight / (float)imageHeight;
}
matrix.postScale(scale, scale, mid.x, mid.y);
setImageMatrix(matrix);
return scale;
}
private void setCenterImage(){
// Center the image
float redundantYSpace = (float)frameHeight - (minScale * (float)bitmapHeight) ;
float redundantXSpace = (float)frameWidth - (minScale * (float)bitmapWidth);
redundantYSpace /= (float)2;
redundantXSpace /= (float)2;
matrix.postTranslate(redundantXSpace, redundantYSpace);
setImageMatrix(matrix);
}
/** Determine the space between the first two fingers */
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);
}
/** Calculate the mid point of the first 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);
}
//-----------------------------------------------------------
private void getRebuildMatrix(){
//確認大小
boolean scaleProblem = checkScale(matrix,true);
if (!scaleProblem){
//改變大小
//matrix.postScale(minScale, minScale, mid.x, mid.y);
matrix.setScale(minScale, minScale);
setCenterImage();
}else{
//確認邊界
float[] check = checkBorder(matrix);
//x1,x2,y1,y2
Log.v(TAG,"確認誰越界 -- "+ check[0] + "," + check[1] + "," + check[2] + "," + check[3]);
if (check[0] != 0f){
matrix.postTranslate(check[0], 0);
setImageMatrix(matrix);
}
if (check[1] != 0f){
matrix.postTranslate(check[1], 0);
setImageMatrix(matrix);
}
if (check[2] != 0f){
matrix.postTranslate(0, check[2]);
setImageMatrix(matrix);
}
if (check[3] != 0f){
matrix.postTranslate(0, check[3]);
setImageMatrix(matrix);
}
}
}
private boolean checkScale(Matrix _m, boolean smallcheck){
float[] f = new float[9];
_m.getValues(f);
// 圖片頂點四座標
float x1 = f[0] * 0 + f[1] * 0 + f[2];
float y1 = f[3] * 0 + f[4] * 0 + f[5];
float x2 = f[0] * bitmapWidth + f[1] * 0 + f[2];
float y2 = f[3] * bitmapWidth + f[4] * 0 + f[5];
// 圖片現在寬度
double width = Math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
float maxWidth = frameWidth *3;
// Log.w(TAG," -- -- -- 比較小? " + frameWidth + " 或比較大?" + maxWidth);
if (smallcheck){
if (width < frameWidth) return false;
}
if (width > maxWidth) return false;
return true;
}
private float[] checkBorder ( Matrix _m){
float[] check = {0f,0f,0f,0f};
float[] f = new float[9];
_m.getValues(f);
// 圖片頂點四座標
float x1 = f[0] * 0 + f[1] * 0 + f[2];
float y1 = f[3] * 0 + f[4] * 0 + f[5];
float x4 = f[0] * bitmapWidth + f[1] * bitmapHeight + f[2];
float y4 = f[3] * bitmapWidth + f[4] * bitmapHeight + f[5];
// 出界判斷
Log.i(TAG,"出界判斷 -- frameWidth : " + frameWidth + " frameHeight : " + frameHeight);
Log.v(TAG,"座標判斷2 -- (" + x1 + ", " + y1 + ") , (" + x4 + ", " + y4 + ")");
if (x1 > 0) check[0] = -x1;
if (x4 < frameWidth)check[1] = frameWidth-x4;
if (y1 > 0) check[2] = -y1;
Log.w(TAG, "-- " + y4 + " vs " + frameHeight + " ( " + this.getHeight() +" )");
if (y4 < frameHeight) check[3] = frameHeight-y4;
return check;
}
}
建立TouchImageView物件的時候：
int bitmapMinWidth = 800;
TouchImageView view = new TouchImageView(ctx,null);
Resources res=getResources();
InputStream is = res.openRawResource(R.drawable.bitmap001);
Bitmap bmp = BitmapFactory.decodeStream(is,null,null);
int bitmapMinHeight = 0;
float s = bitmapMinWidth/(float)bmp.getWidth();
bitmapMinHeight = (int) (bmp.getHeight() * s);
view.setImage(bmp, bitmapMinWidth, bitmapMinHeight);
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