Android 调用系统相机处理大图片问题

来源：互联网发布：远程传输软件编辑：程序博客网时间：2024/05/23 14:34
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 {    /**     * 用于调用系统相机回调     */    private final int SYSTEM_CAMERA_REQUESTCODE = 1;    private final int okend = 2;    // 得到一个整形的路基    private final int TYPE_FILE_IMAGE = 1;    private final int TYPE_FILE_VEDIO = 2;    // 定义一个空的地址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){            /*从保存的文件中取这个拍好的图片*/            Log.i("MyPicture", imageFileUri.getEncodedPath());            setPicToImageView((ImageView)findViewById(R.id.imgurl)                    , new File(imageFileUri.getEncodedPath()));            /*上面没有intent.putExtra(MediaStore.EXTRA_OUTPUT, imageFileUri);的时候*/            /*将返回Bitmap的缩小图放入到data中，可以通过这样的方式取得*///          Bitmap bitmap = (Bitmap) data.getExtras().get("data");//          ((ImageView)findViewById(R.id.imageview)).setImageBitmap(bitmap);        }    }    //-----------------------Android大图的处理方式---------------------------    private void setPicToImageView(ImageView imageView, File imageFile){        int imageViewWidth = imageView.getWidth();        int imageViewHeight = imageView.getHeight();        BitmapFactory.Options opts = new Options();        //设置这个，只得到Bitmap的属性信息放入opts，而不把Bitmap加载到内存中        opts.inJustDecodeBounds = true;         BitmapFactory.decodeFile(imageFile.getAbsolutePath(), opts);        int bitmapWidth = opts.outWidth;        int bitmapHeight = opts.outHeight;        int scale = Math.max(imageViewWidth / bitmapWidth, imageViewHeight / bitmapHeight);        //缩放的比例        opts.inSampleSize = scale;        //内存不足时可被回收        opts.inPurgeable = true;        //设置为false,表示不仅Bitmap的属性，也要加载bitmap        opts.inJustDecodeBounds = false;        Bitmap bitmap = BitmapFactory.decodeFile(imageFile.getPath(), opts);        imageView.setImageBitmap(bitmap);    }    //-----------------------生成Uri---------------------------------------    //得到输出文件的URI    private Uri getOutFileUri(int fileType) {        return Uri.fromFile(getOutFile(fileType));    }    //生成输出文件    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", "创建图片存储路径目录失败");                Log.i("MyPictures", "mediaStorageDir : " + mediaStorageDir.getPath());                return null;            }        }        File file = new File(getFilePath(mediaStorageDir,fileType));        return file;    }    //生成输出文件路径    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;    }    /*检测相机是否存在*/    private boolean checkCameraHardWare(Context context){        PackageManager packageManager = context.getPackageManager();        if (packageManager.hasSystemFeature(PackageManager.FEATURE_CAMERA)){            return true;        }        return false;    }}
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