版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/txfyteen/article/details/43226697
package com.example.webproject;
import android.app.Activity;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.os.Bundle;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
public class ImageMarixActivity extends Activity{
private static final String TAG = "ImageMarixActivity";
private static final int RESULT_CODE_NOFOUND = 200;
private ImageView matrixImageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.imagemarix_activity);
matrixImageView = (ImageView) findViewById(R.id.matriximageview);
//监听图片的触摸事件
matrixImageView.setOnTouchListener(new TouchListener());
}
public final class TouchListener implements OnTouchListener{
//记录拖拽是放大还是缩小
private int mode = 0;//初始状态
private int DRAG_MODE = 1;//拖拽模式
private int ZOOM_MODE = 2 ;//缩小模式
//记录开始的位置
private PointF startPoint = new PointF();
//两个手指中间的距离
private PointF midPont;
//拖拉图片开始移动的坐标位置
private Matrix matrix = new Matrix();
//拖拉图片当前移动的坐标位置
private Matrix currentMatrix = new Matrix();
//开始两个手指的距离
private float twopointstartDis;
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
switch (event.getAction()& MotionEvent.ACTION_MASK) {
//手指按下的时候
case MotionEvent.ACTION_DOWN:
mode = DRAG_MODE;
//记录当前的位置
Log.i(TAG, "当前的位置"+matrixImageView.getImageMatrix());
currentMatrix.set(matrixImageView.getImageMatrix());
//记录手指按下去的位置
startPoint.set(event.getX(), event.getY());
break;
case MotionEvent.ACTION_MOVE:
Log.i(TAG, "移动"+"模式"+mode);
//如果是拖拉模式
if(mode == DRAG_MODE)
{
float dx = event.getX() - startPoint.x;
float dy = event.getY() - startPoint.y;
matrix.set(currentMatrix);//在原有的基础上移动
matrix.postTranslate(dx, dy);
}
else if(mode == ZOOM_MODE)
{
Log.i(TAG, "ZOOM_MODE获取第0个x"+event.getX(0));
Log.i(TAG, "获取第一个x"+event.getX(1));
float endDis = distance(event);
if(endDis >10f)
{
matrix.set(currentMatrix);
float scale =endDis / twopointstartDis;
matrix.postScale(scale, scale,midPont.x,midPont.y);
}
}
break;
case MotionEvent.ACTION_UP:
Log.i(TAG, "一只手指点击后弹起来");
// mode =0;
break;
case MotionEvent.ACTION_POINTER_DOWN:
mode = ZOOM_MODE;
twopointstartDis = distance(event);
if(twopointstartDis>10f)
{
midPont = mid(event);
currentMatrix.set(matrixImageView.getImageMatrix());
}
break;
case MotionEvent.ACTION_POINTER_UP:
Log.i(TAG, "两只手指点击后弹起来");
// Log.i(TAG, "获取第一个x"+event.getX(1)+"获取的第一个x"+event.getY(0));
// Log.i(TAG, "获取第一个x"+(event.getX(1)-event.getY(0)));
mode = 0;
break;
default:
break;
}
matrixImageView.setImageMatrix(matrix);
return true;
}
}
public float distance(MotionEvent event)
{
Log.i(TAG, "调用测距");
float dx = event.getX(1) - event.getX(0);
float dy = event.getY(1) - event.getY(0);
return FloatMath.sqrt(dx*dx+dy*dy);
}
public PointF mid(MotionEvent event)
{
float dx = (event.getX(1)+event.getX(0))/2;
float dy = (event.getY(1)+event.getY(0))/2;
return new PointF(dx,dy);
}
}