Android长按imageview把图片保存到本地的实例代码

public class SaveImageUtils { 
  public static void imageSave(final ImageView imageView, final int id) { 
    Observable 
        .create(new Observable.OnSubscribe<ImageView () { 
              @Override 
              public void call(Subscriber<? super ImageView  sub) { 
                sub.onNext(imageView); 
              } 
            } 
        ).subscribeOn(Schedulers.io()) 
        .observeOn(AndroidSchedulers.mainThread()) 
        .subscribe(new MySubscriber<ImageView () { 
          @Override 
          public void onNext(ImageView imageView) { 
            File imageFile = new File(ActivityUtils.ImagePath(), id + ".jpg"); 
            FileOutputStream outStream = null; 
            try { 
              outStream = new FileOutputStream(imageFile); 
              Bitmap image = imageView.getDrawingCache(); 
              image.compress(Bitmap.CompressFormat.JPEG, 100, outStream); 
              outStream.flush(); 
              outStream.close(); 
              Toast.makeText(UIUtils.getContext(), UIUtils.getString(R.string.save_picture_success), Toast.LENGTH_LONG).show(); 
            } catch (IOException e) { 
              e.printStackTrace(); 
              onError(e); 
            } 
          } 
          @Override 
          public void onError(Throwable e) { 
            Toast.makeText(UIUtils.getContext(), UIUtils.getString(R.string.save_picture_failed), Toast.LENGTH_LONG).show(); 
          } 
        }); 
  } 
} 

public class MySubscriber<T  extends Subscriber<T  { 
  @Override 
  public void onStart() { 
    super.onStart(); 
  } 
  @Override 
  public void onCompleted() { 
  } 
  @Override 
  public void onError(Throwable e) { 
  } 
  @Override 
  public void onNext(T t) { 
  } 
}
//不建议使用了

package com.app.mly.utils;

import android.app.Activity;

import android.graphics.Bitmap;

import android.os.AsyncTask;

import android.os.Environment;

import android.widget.ImageView;

import android.widget.Toast;

import com.fengche.android.mly.R;

import java.io.File;

import java.io.FileOutputStream;

/**

Created by y on 2016/1/14.

*/

public class SaveImageUtils extends AsyncTask<Bitmap, Void, String  {

Activity mActivity;

ImageView mImageView;

public SaveImageUtils(Activity activity, ImageView imageView) {

this.mImageView = imageView;

this.mActivity = activity;

}

@Override

protected String doInBackground(Bitmap... params) {

String result = mActivity.getResources().getString(R.string.save_picture_failed);

try {

String sdcard = Environment.getExternalStorageDirectory().toString();

File file = new File(sdcard + "/123");

if (!file.exists()) {

file.mkdirs();

}

File imageFile = new File(file.getAbsolutePath(), "命名" + ".jpg");

FileOutputStream outStream = null;

outStream = new FileOutputStream(imageFile);

Bitmap image = params[0];

image.compress(Bitmap.CompressFormat.JPEG, 100, outStream);

outStream.flush();

outStream.close();

result = mActivity.getResources().getString(R.string.save_picture_success, file.getAbsolutePath());

} catch (Exception e) {

e.printStackTrace();

}

return result;

}

@Override

protected void onPostExecute(String result) {

Toast.makeText(mActivity, result, Toast.LENGTH_SHORT).show();

mImageView.setDrawingCacheEnabled(false);

}

} 

<string name="save_picture" 保存图片</string

<string name="save_picture_failed" 保存失败</string

<string name="save_picture_success" 图片成功保存至%s目录</string  

mScanCode.setOnLongClickListener(new View.OnLongClickListener() {

@Override

public boolean onLongClick(View v) {

AlertDialog.Builder builder = new AlertDialog.Builder(ShareActivity.this);

builder.setItems(new String[]{getResources().getString(R.string.save_picture)}, new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

mScanCode.setDrawingCacheEnabled(true);

Bitmap imageBitmap = mScanCode.getDrawingCache();

if (imageBitmap != null) {

new SaveImageUtils(ShareActivity.this, mScanCode).execute(imageBitmap);

}

}

});

builder.show();

return true;

}

});