图片过大处理

package com.stu.activity;import android.app.Activity;import android.content.Intent;import android.database.Cursor;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.media.ThumbnailUtils;import android.net.Uri;import android.os.Build;import android.os.Bundle;import android.provider.MediaStore;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;import android.widget.Toast;import com.maizi.activity.R;public class MainActivity extends Activity {Button carmBtn;ImageView photo;int PICTURE_GET = 200;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main_activity);carmBtn = (Button) findViewById(R.id.bt_carmer);photo = (ImageView) findViewById(R.id.iv_photo);carmBtn.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent();intent.setAction(Intent.ACTION_GET_CONTENT);intent.setType("image/*");startActivityForResult(intent, PICTURE_GET);}});}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);if (requestCode == PICTURE_GET && data != null) {Uri uri = data.getData();String imagePath = getAbsoluteImagePath(this, uri);Bitmap bitmap = null;try {BitmapFactory.Options opts = new BitmapFactory.Options();opts.inJustDecodeBounds = true;BitmapFactory.decodeFile(imagePath, opts);opts.inSampleSize = computeSampleSize(opts, -1, 700*780);  opts.inJustDecodeBounds = false;bitmap = BitmapFactory.decodeFile(imagePath, opts);photo.setImageBitmap(bitmap);} catch (OutOfMemoryError e) {// 这个异常是可以捕捉的，习惯性写上去Toast.makeText(MainActivity.this, "图片太大", Toast.LENGTH_SHORT).show();return;}}}// 获取图片的路径public static String getAbsoluteImagePath(Activity mContext, Uri uri) {String[] proj = { MediaStore.Images.Media.DATA };Cursor cursor = mContext.managedQuery(uri, proj, null, null, null);int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);cursor.moveToFirst();String res = cursor.getString(column_index);try {// 4.0以上的版本会自动关闭 (4.0--14;; 4.0.3--15)if (Integer.parseInt(Build.VERSION.SDK) < 14) {cursor.close();}} catch (Exception e) {e.printStackTrace();}return res;}/** *  * @date   2014-6-8    下午11:31:25   Android源码动态算缩小值 */public static int computeSampleSize(BitmapFactory.Options options,int minSideLength, int maxNumOfPixels) {int initialSize = computeInitialSampleSize(options, minSideLength,maxNumOfPixels);int roundedSize;if (initialSize <= 8) {roundedSize = 1;while (roundedSize < initialSize) {roundedSize <<= 1;}} else {roundedSize = (initialSize + 7) / 8 * 8;}return roundedSize;}public static int computeInitialSampleSize(BitmapFactory.Options options,int minSideLength, int maxNumOfPixels) {double w = options.outWidth;double h = options.outHeight;int lowerBound = (maxNumOfPixels == -1) ? 1 : (int) Math.ceil(Math.sqrt(w * h / maxNumOfPixels));int upperBound = (minSideLength == -1) ? 128 : (int) Math.min(Math.floor(w / minSideLength), Math.floor(h / minSideLength));if (upperBound < lowerBound) {return lowerBound;}if ((maxNumOfPixels == -1) && (minSideLength == -1)) {return 1;} else if (minSideLength == -1) {return lowerBound;} else {return upperBound;}}}