Android 調用系統相機處理大圖片問題

package cn.panghu.camera;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.Toast;

import com.example.camerademoapp.R;

public class MyCamera extends Activity {
    /**
     * 用於調用系統相機回調
     */

    private final int SYSTEM_CAMERA_REQUESTCODE = 1;
    private final int okend = 2;
    // 得到一個整形的路基
    private final int TYPE_FILE_IMAGE = 1;
    private final int TYPE_FILE_VEDIO = 2;

    // 定義一個空的地址url
    private Uri imageFileUri = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mycamera);
        findViewById(R.id.button).setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                Intent intent = new Intent();
                intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
                imageFileUri = getOutFileUri(TYPE_FILE_IMAGE);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageFileUri);
                startActivityForResult(intent, SYSTEM_CAMERA_REQUESTCODE);

            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == SYSTEM_CAMERA_REQUESTCODE && resultCode == RESULT_OK){
            /*從保存的文件中取這個拍好的圖片*/
            Log.i("MyPicture", imageFileUri.getEncodedPath());
            setPicToImageView((ImageView)findViewById(R.id.imgurl)
                    , new File(imageFileUri.getEncodedPath()));

            /*上面沒有intent.putExtra(MediaStore.EXTRA_OUTPUT, imageFileUri);的時候*/
            /*將返回Bitmap的縮小圖放入到data中，可以通過這樣的方式取得*/
//          Bitmap bitmap = (Bitmap) data.getExtras().get("data");
//          ((ImageView)findViewById(R.id.imageview)).setImageBitmap(bitmap);
        }
    }

    //-----------------------Android大圖的處理方式---------------------------
    private void setPicToImageView(ImageView imageView, File imageFile){
        int imageViewWidth = imageView.getWidth();
        int imageViewHeight = imageView.getHeight();
        BitmapFactory.Options opts = new Options();

        //設置這個，只得到Bitmap的屬性信息放入opts，而不把Bitmap加載到內存中
        opts.inJustDecodeBounds = true; 
        BitmapFactory.decodeFile(imageFile.getAbsolutePath(), opts);

        int bitmapWidth = opts.outWidth;
        int bitmapHeight = opts.outHeight;

        int scale = Math.max(imageViewWidth / bitmapWidth, imageViewHeight / 

bitmapHeight);

        //縮放的比例
        opts.inSampleSize = scale;
        //內存不足時可被回收
        opts.inPurgeable = true;
        //設置爲false,表示不僅Bitmap的屬性，也要加載bitmap
        opts.inJustDecodeBounds = false;

        Bitmap bitmap = BitmapFactory.decodeFile(imageFile.getPath(), opts);
        imageView.setImageBitmap(bitmap);
    }

    //-----------------------生成Uri---------------------------------------
    //得到輸出文件的URI
    private Uri getOutFileUri(int fileType) {
        return Uri.fromFile(getOutFile(fileType));
    }

    //生成輸出文件
    private File getOutFile(int fileType) {

        String storageState = Environment.getExternalStorageState();
        if (Environment.MEDIA_REMOVED.equals(storageState)){
            Toast.makeText(getApplicationContext(), "oh,no, SD卡不存在", 

Toast.LENGTH_SHORT).show();
            return null;
        }

        File mediaStorageDir = new File (Environment
                .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)
                ,"MyPictures");
        if (!mediaStorageDir.exists()){
            if (!mediaStorageDir.mkdirs()){
                Log.i("MyPictures", "創建圖片存儲路徑目錄失敗");
                Log.i("MyPictures", "mediaStorageDir : " + 

mediaStorageDir.getPath());
                return null;
            }
        }

        File file = new File(getFilePath(mediaStorageDir,fileType));

        return file;
    }
    //生成輸出文件路徑
    private String getFilePath(File mediaStorageDir, int fileType){
        String timeStamp =new SimpleDateFormat("yyyyMMdd_HHmmss")
                            .format(new Date());
        String filePath = mediaStorageDir.getPath() + File.separator;
        if (fileType == TYPE_FILE_IMAGE){
            filePath += ("IMG_" + timeStamp + ".jpg");
        }else if (fileType == TYPE_FILE_VEDIO){
            filePath += ("VIDEO_" + timeStamp + ".mp4");
        }else{
            return null;
        }
        return filePath;
    }


    /*檢測相機是否存在*/
    private boolean checkCameraHardWare(Context context){
        PackageManager packageManager = context.getPackageManager();
        if (packageManager.hasSystemFeature(PackageManager.FEATURE_CAMERA)){
            return true;
        }
        return false;
    }
}