android 图片之多点触控放大缩小

Activity:

package com.bocom;import android.app.Activity;import android.content.pm.ActivityInfo;import android.graphics.BitmapFactory;import android.graphics.Matrix;import android.graphics.PointF;import android.os.Bundle;import android.util.FloatMath;import android.util.Log;import android.view.Menu;import android.view.MotionEvent;import android.view.View;import android.view.Window;import android.view.View.OnTouchListener;import android.widget.ImageView;import android.widget.ImageView.ScaleType;public class MainActivityImage extends Activity implements OnTouchListener {private ImageView imgview;private ImageView img;private Matrix matrix = new Matrix();private Matrix savedMatrix = new Matrix();static final int NONE = 0;static final int DRAG = 1;static final int ZOOM = 2;int mode = NONE;// Remember some things for zoomingPointF start = new PointF();PointF mid = new PointF();float oldDist = 1f;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_main_activity_image);setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);imgview = (ImageView) this.findViewById(R.id.imag1);// imgview.setAnimation(AnimationUtils.loadAnimation(this,// R.anim.newanim));//img = (ImageView) this.findViewById(R.id.imag);//Matrix mt = img.getImageMatrix();//// mt.postRotate(30);//mt.postScale(0.5f, 0.5f);//mt.postScale(1.5f, 1.5f);//mt.postRotate(30, 130, 100);//mt.postTranslate(100, 10);////img.setImageMatrix(mt);// imgview.setLongClickable(true);String v=getIntent().getStringExtra("iv");if("1".equals(v))imgview.setImageBitmap(BitmapFactory.decodeResource(this.getResources(), R.drawable.i1_1));if("2".equals(v))imgview.setImageBitmap(BitmapFactory.decodeResource(this.getResources(), R.drawable.i1_2));imgview.setOnTouchListener(this);imgview.setLongClickable(true);}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);}@Overridepublic boolean onTouch(View v, MotionEvent event) {// TODO Auto-generated method stub/* * Log.d("Infor", "类别:"+event.getAction()); Log.d("Infor", * "mask:"+event.getActionMasked()); Log.d("Infor", * "index:"+event.getActionIndex()); Log.d("Infor", * "points:"+event.getPointerCount()); */ScaleType type=ScaleType.MATRIX;imgview.setScaleType(type);Log.d("Infor", "size:" + event.getSize());if (event.getActionMasked() == MotionEvent.ACTION_POINTER_UP)Log.d("Infor", "多点操作");switch (event.getActionMasked()) {case MotionEvent.ACTION_DOWN:matrix.set(imgview.getImageMatrix());savedMatrix.set(matrix);start.set(event.getX(), event.getY());Log.d("Infor", "触摸了...");mode = DRAG;break;case MotionEvent.ACTION_POINTER_DOWN: // 多点触控oldDist = this.spacing(event);if (oldDist > 10f) {Log.d("Infor", "oldDist" + oldDist);savedMatrix.set(matrix);midPoint(mid, event);mode = ZOOM;}break;case MotionEvent.ACTION_POINTER_UP:mode = NONE;break;case MotionEvent.ACTION_MOVE:if (mode == DRAG) { // 此实现图片的拖动功能...matrix.set(savedMatrix);matrix.postTranslate(event.getX() - start.x, event.getY()- start.y);} else if (mode == ZOOM) {// 此实现图片的缩放功能...float newDist = spacing(event);if (newDist > 10) {matrix.set(savedMatrix);float scale = newDist / oldDist;matrix.postScale(scale, scale, mid.x, mid.y);}}break;}imgview.setImageMatrix(matrix);return false;}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.activity_main_activity_image, menu);return true;}}

xml:

<?xml version="1.0" encoding="UTF-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_height="fill_parent"     android:layout_width="fill_parent"     android:id="@+id/linearLayout1"     >        <ImageView         android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:id="@+id/imag1"        android:scaleType="center"        ></ImageView>   </RelativeLayout>

Manifast,colors.xml,styles.xml:

<activity            android:name=".MainActivityImage"            android:theme="@style/Transparent"             android:label="@string/title_activity_main_activity_image" >        </activity><?xml version="1.0" encoding="utf-8"?><resources>    <color name="transparent">#9000</color></resources><style  name="Transparent"> 　　<item name="android:windowBackground">@color/transparent</item> 　　<item name ="android:windowIsTranslucent">true</item> 　　<item  name="android:windowAnimationStyle">@+android:style/Animation.Translucent</item> 　　</style>

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