分類: Android 2012-10-10 17:37 1737人閱讀 評論(2) 收藏 舉報 android float layout constructor distance matrix
前一段時間寫的,現在分享出來供大家參考。
研究過圖庫的源碼,但着實太複雜,我都看不懂!也參考過網上的一些源碼,但很多功能都不全,都不是我想要的! 結合網上的代碼以及圖庫的部分源碼自己寫了一個類。
未實作的功能——逐級放大,這個矩陣變換把我弄暈了,而且項目中也用不到,是以就沒再研究。
該子產品主要實作了放大和原大兩個級别的縮放。
功能有:
- 以觸摸點為中心放大(這個是網上其他的代碼沒有的)
- 邊界控制(這個是網上其他的代碼沒有的)
- 輕按兩下放大或縮小(主要考慮到電阻屏)
- 多點觸摸放大和縮小
這個子產品已經通過了測試,并且使用者也使用有一段時間了,是屬于比較穩定的了。
下面貼上代碼及使用方法(沒有寫測試項目,大家見諒):
ImageControl.cs 類似一個使用者自定義的ImageView控件。用法将在下面的代碼中貼出。
[java] view plain copy
- import android.content.Context;
- import android.graphics.Bitmap;
- import android.graphics.Matrix;
- import android.util.AttributeSet;
- import android.util.FloatMath;
- import android.view.MotionEvent;
- import android.widget.ImageView;
- public class ImageControl extends ImageView {
- public ImageControl(Context context) {
- super(context);
- // TODO Auto-generated constructor stub
- }
- public ImageControl(Context context, AttributeSet attrs) {
- super(context, attrs);
- // TODO Auto-generated constructor stub
- }
- public ImageControl(Context context, AttributeSet attrs, int defStyle) {
- super(context, attrs, defStyle);
- // TODO Auto-generated constructor stub
- }
- // ImageView img;
- Matrix imgMatrix = null; // 定義圖檔的變換矩陣
- static final int DOUBLE_CLICK_TIME_SPACE = 300; // 輕按兩下時間間隔
- static final int DOUBLE_POINT_DISTANCE = 10; // 兩點放大兩點間最小間距
- static final int NONE = 0;
- static final int DRAG = 1; // 拖動操作
- static final int ZOOM = 2; // 放大縮小操作
- private int mode = NONE; // 目前模式
- float bigScale = 3f; // 預設放大倍數
- Boolean isBig = false; // 是否是放大狀态
- long lastClickTime = 0; // 單擊時間
- float startDistance; // 多點觸摸兩點距離
- float endDistance; // 多點觸摸兩點距離
- float topHeight; // 狀态欄高度和标題欄高度
- Bitmap primaryBitmap = null;
- float contentW; // 螢幕内容區寬度
- float contentH; // 螢幕内容區高度
- float primaryW; // 原圖寬度
- float primaryH; // 原圖高度
- float scale; // 适合螢幕縮放倍數
- Boolean isMoveX = true; // 是否允許在X軸拖動
- Boolean isMoveY = true; // 是否允許在Y軸拖動
- float startX;
- float startY;
- float endX;
- float endY;
- float subX;
- float subY;
- float limitX1;
- float limitX2;
- float limitY1;
- float limitY2;
- ICustomMethod mCustomMethod = null;
- public void imageInit(Bitmap bitmap, int contentW, int contentH,
- int topHeight, ICustomMethod iCustomMethod) {
- this.primaryBitmap = bitmap;
- this.contentW = contentW;
- this.contentH = contentH;
- this.topHeight = topHeight;
- mCustomMethod = iCustomMethod;
- primaryW = primaryBitmap.getWidth();
- primaryH = primaryBitmap.getHeight();
- float scaleX = (float) contentW / primaryW;
- float scaleY = (float) contentH / primaryH;
- scale = scaleX < scaleY ? scaleX : scaleY;
- if (scale < 1 && 1 / scale < bigScale) {
- bigScale = (float) (1 / scale + 0.5);
- }
- imgMatrix = new Matrix();
- subX = (contentW - primaryW * scale) / 2;
- subY = (contentH - primaryH * scale) / 2;
- this.setImageBitmap(primaryBitmap);
- this.setScaleType(ScaleType.MATRIX);
- imgMatrix.postScale(scale, scale);
- imgMatrix.postTranslate(subX, subY);
- this.setImageMatrix(imgMatrix);
- }
- public void mouseDown(MotionEvent event) {
- mode = NONE;
- startX = event.getRawX();
- startY = event.getRawY();
- if (event.getPointerCount() == 1) {
- // 如果兩次點選時間間隔小于一定值,則預設為輕按兩下事件
- if (event.getEventTime() - lastClickTime < DOUBLE_CLICK_TIME_SPACE) {
- changeSize(startX, startY);
- } else if (isBig) {
- mode = DRAG;
- }
- }
- lastClickTime = event.getEventTime();
- }
- public void mousePointDown(MotionEvent event) {
- startDistance = getDistance(event);
- if (startDistance > DOUBLE_POINT_DISTANCE) {
- mode = ZOOM;
- } else {
- mode = NONE;
- }
- }
- public void mouseMove(MotionEvent event) {
- if ((mode == DRAG) && (isMoveX || isMoveY)) {
- float[] XY = getTranslateXY(imgMatrix);
- float transX = 0;
- float transY = 0;
- if (isMoveX) {
- endX = event.getRawX();
- transX = endX - startX;
- if ((XY[0] + transX) <= limitX1) {
- transX = limitX1 - XY[0];
- }
- if ((XY[0] + transX) >= limitX2) {
- transX = limitX2 - XY[0];
- }
- }
- if (isMoveY) {
- endY = event.getRawY();
- transY = endY - startY;
- if ((XY[1] + transY) <= limitY1) {
- transY = limitY1 - XY[1];
- }
- if ((XY[1] + transY) >= limitY2) {
- transY = limitY2 - XY[1];
- }
- }
- imgMatrix.postTranslate(transX, transY);
- startX = endX;
- startY = endY;
- this.setImageMatrix(imgMatrix);
- } else if (mode == ZOOM && event.getPointerCount() > 1) {
- endDistance = getDistance(event);
- float dif = endDistance - startDistance;
- if (Math.abs(endDistance - startDistance) > DOUBLE_POINT_DISTANCE) {
- if (isBig) {
- if (dif < 0) {
- changeSize(0, 0);
- mode = NONE;
- }
- } else if (dif > 0) {
- float x = event.getX(0) / 2 + event.getX(1) / 2;
- float y = event.getY(0) / 2 + event.getY(1) / 2;
- changeSize(x, y);
- mode = NONE;
- }
- }
- }
- }
- public void mouseUp() {
- mode = NONE;
- }
- private void changeSize(float x, float y) {
- if (isBig) {
- // 如果處于最大狀态,則還原
- imgMatrix.reset();
- imgMatrix.postScale(scale, scale);
- imgMatrix.postTranslate(subX, subY);
- isBig = false;
- } else {
- imgMatrix.postScale(bigScale, bigScale); // 在原有矩陣後乘放大倍數
- float transX = -((bigScale - 1) * x);
- float transY = -((bigScale - 1) * (y - topHeight)); // (bigScale-1)(y-statusBarHeight-subY)+2*subY;
- float currentWidth = primaryW * scale * bigScale; // 放大後圖檔大小
- float currentHeight = primaryH * scale * bigScale;
- // 如果圖檔放大後超出螢幕範圍處理
- if (currentHeight > contentH) {
- limitY1 = -(currentHeight - contentH); // 平移限制
- limitY2 = 0;
- isMoveY = true; // 允許在Y軸上拖動
- float currentSubY = bigScale * subY; // 目前平移距離
- // 平移後,内容區域上部有空白處理辦法
- if (-transY < currentSubY) {
- transY = -currentSubY;
- }
- // 平移後,内容區域下部有空白處理辦法
- if (currentSubY + transY < limitY1) {
- transY = -(currentHeight + currentSubY - contentH);
- }
- } else {
- // 如果圖檔放大後沒有超出螢幕範圍處理,則不允許拖動
- isMoveY = false;
- }
- if (currentWidth > contentW) {
- limitX1 = -(currentWidth - contentW);
- limitX2 = 0;
- isMoveX = true;
- float currentSubX = bigScale * subX;
- if (-transX < currentSubX) {
- transX = -currentSubX;
- }
- if (currentSubX + transX < limitX1) {
- transX = -(currentWidth + currentSubX - contentW);
- }
- } else {
- isMoveX = false;
- }
- imgMatrix.postTranslate(transX, transY);
- isBig = true;
- }
- this.setImageMatrix(imgMatrix);
- if (mCustomMethod != null) {
- mCustomMethod.customMethod(isBig);
- }
- }
- private float[] getTranslateXY(Matrix matrix) {
- float[] values = new float[9];
- matrix.getValues(values);
- float[] floats = new float[2];
- floats[0] = values[Matrix.MTRANS_X];
- floats[1] = values[Matrix.MTRANS_Y];
- return floats;
- }
- private float getDistance(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);
- }
- public interface ICustomMethod {
- public void customMethod(Boolean currentStatus);
- }
- }
ImageVewActivity.cs 這個用于測試的Activity
[java] view plain copy
- import android.app.Activity;
- import android.graphics.Bitmap;
- import android.graphics.Rect;
- import android.graphics.drawable.BitmapDrawable;
- import android.os.Bundle;
- import android.view.MotionEvent;
- import android.view.View;
- import android.widget.LinearLayout;
- import android.widget.TextView;
- import android.widget.Toast;
- import ejiang.boiler.ImageControl.ICustomMethod;
- import ejiang.boiler.R.id;
- public class ImageViewActivity extends Activity {
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- // TODO Auto-generated method stub
- super.onCreate(savedInstanceState);
- setContentView(R.layout.common_image_view);
- findView();
- }
- public void onWindowFocusChanged(boolean hasFocus) {
- super.onWindowFocusChanged(hasFocus);
- init();
- }
- ImageControl imgControl;
- LinearLayout llTitle;
- TextView tvTitle;
- private void findView() {
- imgControl = (ImageControl) findViewById(id.common_imageview_imageControl1);
- llTitle = (LinearLayout) findViewById(id.common_imageview_llTitle);
- tvTitle = (TextView) findViewById(id.common_imageview_title);
- }
- private void init() {
- tvTitle.setText("圖檔測試");
- // 這裡可以為imgcontrol的圖檔路徑動态指派
- // ............
- Bitmap bmp;
- if (imgControl.getDrawingCache() != null) {
- bmp = Bitmap.createBitmap(imgControl.getDrawingCache());
- } else {
- bmp = ((BitmapDrawable) imgControl.getDrawable()).getBitmap();
- }
- Rect frame = new Rect();
- getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
- int statusBarHeight = frame.top;
- int screenW = this.getWindowManager().getDefaultDisplay().getWidth();
- int screenH = this.getWindowManager().getDefaultDisplay().getHeight()
- - statusBarHeight;
- if (bmp != null) {
- imgControl.imageInit(bmp, screenW, screenH, statusBarHeight,
- new ICustomMethod() {
- @Override
- public void customMethod(Boolean currentStatus) {
- // 當圖檔處于放大或縮小狀态時,控制标題是否顯示
- if (currentStatus) {
- llTitle.setVisibility(View.GONE);
- } else {
- llTitle.setVisibility(View.VISIBLE);
- }
- }
- });
- }
- else
- {
- Toast.makeText(ImageViewActivity.this, "圖檔加載失敗,請稍候再試!", Toast.LENGTH_SHORT)
- .show();
- }
- }
- @Override
- public boolean onTouchEvent(MotionEvent event) {
- switch (event.getAction() & MotionEvent.ACTION_MASK) {
- case MotionEvent.ACTION_DOWN:
- imgControl.mouseDown(event);
- break;
- case MotionEvent.ACTION_POINTER_DOWN:
- imgControl.mousePointDown(event);
- break;
- case MotionEvent.ACTION_MOVE:
- imgControl.mouseMove(event);
- break;
- case MotionEvent.ACTION_UP:
- imgControl.mouseUp();
- break;
- }
- return super.onTouchEvent(event);
- }
- }
在上面的代碼中,需要注意兩點。一Activity中要重寫onTouchEvent方法,将觸摸事件傳遞到ImageControl,這點類似于WPF中的路由事件機制。二初始化imgControl即imgControl.imageInit,注意其中的參數。最後一個參數類似于C#中的委托,我這裡使用接口來實作,在放大縮小的切換時要執行的操作都解除安裝這個方法中。
common_image_view.xml 布局檔案
[html] view plain copy
- <?xml version="1.0" encoding="utf-8"?>
- <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:id="@+id/rl"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent" >
- <ejiang.boiler.ImageControl
- android:id="@+id/common_imageview_imageControl1"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:src="@drawable/ic_launcher" />
- <LinearLayout
- android:id="@+id/common_imageview_llTitle"
- style="@style/reportTitle1"
- android:layout_alignParentLeft="true"
- android:layout_alignParentTop="true" >
- <TextView
- android:id="@+id/common_imageview_title"
- style="@style/title2"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:layout_weight="1"
- android:text="報告" />
- </LinearLayout>
- </RelativeLayout>
我學習android的時間也不長,是以有什麼纰漏或錯誤,歡迎大家指出!