Android实现图片放大缩小--中国移动开发者社区.docx

Android 实现图片放大缩小--中国移动开发者社区 Android 实现图片放大缩小 -- 未审核编辑文档 package com.min.Test_Gallery; import Android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Color; import android.graphics.Matrix; import android.os.Bundle; import android.util.DisplayMetrics; import android.util.Log; import android.view.GestureDetector; import android.view.KeyEvent; import android.view.MotionEvent; import android.view.View; import android.view.GestureDetector.OnGestureListener; import android.view.View.OnTouchListener; import android.widget.Button; import android.widget.FrameLayout; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.Toast; public class DisplayImage extends Activity implements OnTouchListener, OnGestureListener { private static final String TAG = DisplayImage; private static final int FLING_MIN_DISTANCE = 100; private static final int FLING_MIN_VELOCITY = 200; /* 相关变量声明 */ private ImageView mImageView; private Button mButton01; private Button mButton02; private FrameLayout layout1; private LinearLayout layoutImage; private Bitmap bmp; private int id=0; private int displayWidth; private int displayHeight; private float scaleWidth=1; private float scaleHeight=1; private GestureDetector mGestureDetector; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); /* 加载 display.xml Layout */ setContentView(R.layout.display); /* 取得屏幕分辨率大小 */ DisplayMetrics dm=new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(dm); displayWidth=dm.widthPixels; displayHeight=dm.heightPixels; /* 初始化相关变量 */ Bundle bundle = this.getIntent().getExtras(); Integer imageId = bundle.getInt(imageId); Log.i(TAG, onCreate, imageId = + imageId); bmp=BitmapFactory.decodeResource(getResources(), imageId); mImageView = (ImageView)findViewById(R.id.myImageView); mImageView.setImageBitmap(bmp); mImageView.setOnT