图片放大缩小(ps如何把图片放大缩小)

编辑：rootadmin

package com.example.testzoom;import android.os.Bundle;import android.app.Activity;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;import android.widget.ImageView;import android.widget.RelativeLayout;import android.widget.RelativeLayout.LayoutParams;public class MainActivity extends Activity {// 被缩放的图片private ImageView imageView;private float lastDistance = -1;RelativeLayout root;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);imageView = (ImageView) findViewById(R.id.imageView1);root = (RelativeLayout) findViewById(R.id.root);// 设置触摸监听器root.setOnTouchListener(new OnTouchListener() {@Overridepublic boolean onTouch(View v, MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_POINTER_DOWN:System.out.println("DOWN");break;case MotionEvent.ACTION_MOVE:System.out.println("MOVE");if (event.getPointerCount() > 1) {float offsetX = event.getX(0) - event.getX(1);float offsetY = event.getY(0) - event.getX(1);RelativeLayout.LayoutParams layoutparams = (LayoutParams) imageView.getLayoutParams();float curDistance = (float) Math.sqrt(offsetX * offsetX&#; offsetY * offsetY);if (lastDistance < 0) {lastDistance = curDistance;} else {if (lastDistance - curDistance > 5) {layoutparams.width = (int) (0.9f * imageView.getWidth());layoutparams.height = (int) (0.9f * imageView.getHeight());} else if (curDistance - lastDistance > 5) {layoutparams.width = (int) (1.1f * imageView.getWidth());layoutparams.height = (int) (1.1f * imageView.getWidth());}lastDistance = curDistance;imageView.setLayoutParams(layoutparams);}}break;case MotionEvent.ACTION_UP:System.out.println("UP");break;default:break;}return true;}});}

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}

//感觉效果没有相册里面的图片放大缩小好

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