Android 可平移,缩放,旋转的ImageView
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在网上搜到很多都是一样的版本,只有平移和缩放的功能。我在搜到的源代码基础上添加了旋转和边界检查的功能。
代码主要分两部分,一个activity一个view,代码如下:
- package com.example.touch;
- import android.app.Activity;
- import android.os.Bundle;
- public class TouchImageViewActivity extends Activity {
- /** Called when the activity is first created. */
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- TouchImageView img = new TouchImageView(this);
- setContentView(img);
- }
- }
- package com.example.touch;
- import android.graphics.Bitmap;
- import android.graphics.Bitmap.Config;
- import android.graphics.BitmapFactory;
- import android.graphics.Canvas;
- import android.graphics.Matrix;
- import android.graphics.PointF;
- import android.util.DisplayMetrics;
- import android.util.FloatMath;
- import android.view.MotionEvent;
- import android.widget.ImageView;
- public class TouchImageView extends ImageView {
- float x_down = 0;
- float y_down = 0;
- PointF start = new PointF();
- PointF mid = new PointF();
- float oldDist = 1f;
- float oldRotation = 0;
- Matrix matrix = new Matrix();
- Matrix matrix1 = new Matrix();
- Matrix savedMatrix = new Matrix();
- private static final int NONE = 0;
- private static final int DRAG = 1;
- private static final int ZOOM = 2;
- int mode = NONE;
- boolean matrixCheck = false;
- int widthScreen;
- int heightScreen;
- Bitmap gintama;
- public TouchImageView(TouchImageViewActivity activity) {
- super(activity);
- gintama = BitmapFactory.decodeResource(getResources(), R.drawable.gintama);
- DisplayMetrics dm = new DisplayMetrics();
- activity.getWindowManager().getDefaultDisplay().getMetrics(dm);
- widthScreen = dm.widthPixels;
- heightScreen = dm.heightPixels;
- matrix = new Matrix();
- }
- protected void onDraw(Canvas canvas) {
- canvas.save();
- canvas.drawBitmap(gintama, matrix, null);
- canvas.restore();
- }
- public boolean onTouchEvent(MotionEvent event) {
- switch (event.getAction() & MotionEvent.ACTION_MASK) {
- case MotionEvent.ACTION_DOWN:
- mode = DRAG;
- x_down = event.getX();
- y_down = event.getY();
- savedMatrix.set(matrix);
- break;
- case MotionEvent.ACTION_POINTER_DOWN:
- mode = ZOOM;
- oldDist = spacing(event);
- oldRotation = rotation(event);
- savedMatrix.set(matrix);
- midPoint(mid, event);
- break;
- case MotionEvent.ACTION_MOVE:
- if (mode == ZOOM) {
- matrix1.set(savedMatrix);
- float rotation = rotation(event) - oldRotation;
- float newDist = spacing(event);
- float scale = newDist / oldDist;
- matrix1.postScale(scale, scale, mid.x, mid.y);// 縮放
- matrix1.postRotate(rotation, mid.x, mid.y);// 旋轉
- matrixCheck = matrixCheck();
- if (matrixCheck == false) {
- matrix.set(matrix1);
- invalidate();
- }
- } else if (mode == DRAG) {
- matrix1.set(savedMatrix);
- matrix1.postTranslate(event.getX() - x_down, event.getY()
- - y_down);// 平移
- matrixCheck = matrixCheck();
- matrixCheck = matrixCheck();
- if (matrixCheck == false) {
- matrix.set(matrix1);
- invalidate();
- }
- }
- break;
- case MotionEvent.ACTION_UP:
- case MotionEvent.ACTION_POINTER_UP:
- mode = NONE;
- break;
- }
- return true;
- }
- private boolean matrixCheck() {
- float[] f = new float[9];
- matrix1.getValues(f);
- // 图片4个顶点的坐标
- float x1 = f[0] * 0 + f[1] * 0 + f[2];
- float y1 = f[3] * 0 + f[4] * 0 + f[5];
- float x2 = f[0] * gintama.getWidth() + f[1] * 0 + f[2];
- float y2 = f[3] * gintama.getWidth() + f[4] * 0 + f[5];
- float x3 = f[0] * 0 + f[1] * gintama.getHeight() + f[2];
- float y3 = f[3] * 0 + f[4] * gintama.getHeight() + f[5];
- float x4 = f[0] * gintama.getWidth() + f[1] * gintama.getHeight() + f[2];
- float y4 = f[3] * gintama.getWidth() + f[4] * gintama.getHeight() + f[5];
- // 图片现宽度
- double width = Math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
- // 缩放比率判断
- if (width < widthScreen / 3 || width > widthScreen * 3) {
- return true;
- }
- // 出界判断
- if ((x1 < widthScreen / 3 && x2 < widthScreen / 3
- && x3 < widthScreen / 3 && x4 < widthScreen / 3)
- || (x1 > widthScreen * 2 / 3 && x2 > widthScreen * 2 / 3
- && x3 > widthScreen * 2 / 3 && x4 > widthScreen * 2 / 3)
- || (y1 < heightScreen / 3 && y2 < heightScreen / 3
- && y3 < heightScreen / 3 && y4 < heightScreen / 3)
- || (y1 > heightScreen * 2 / 3 && y2 > heightScreen * 2 / 3
- && y3 > heightScreen * 2 / 3 && y4 > heightScreen * 2 / 3)) {
- return true;
- }
- return false;
- }
- // 触碰两点间距离
- 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);
- }
- // 取手势中心点
- 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);
- }
- // 取旋转角度
- private float rotation(MotionEvent event) {
- double delta_x = (event.getX(0) - event.getX(1));
- double delta_y = (event.getY(0) - event.getY(1));
- double radians = Math.atan2(delta_y, delta_x);
- return (float) Math.toDegrees(radians);
- }
- // 将移动,缩放以及旋转后的图层保存为新图片
- // 本例中沒有用到該方法,需要保存圖片的可以參考
- public Bitmap CreatNewPhoto() {
- Bitmap bitmap = Bitmap.createBitmap(widthScreen, heightScreen,
- Config.ARGB_8888); // 背景图片
- Canvas canvas = new Canvas(bitmap); // 新建画布
- canvas.drawBitmap(gintama, matrix, null); // 画图片
- canvas.save(Canvas.ALL_SAVE_FLAG); // 保存画布
- canvas.restore();
- return bitmap;
- }
- }
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