Android长按imageview把图片保存到本地

rxjava版本：

    compile 'io.reactivex:rxjava:1.1.5'    compile 'io.reactivex:rxandroid:1.2.0'

示例代码：

public class MainActivity extends AppCompatActivity {    private ImageView imageView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        imageView = (ImageView) findViewById(R.id.imageview);        findViewById(R.id.btn_save).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                saveImageView(getViewBitmap(imageView));            }        });    }    private class SaveObservable implements Observable.OnSubscribe {        private Bitmap drawingCache = null;        public SaveObservable(Bitmap drawingCache) {            this.drawingCache = drawingCache;        }        @Override        public void call(Subscriber<? super String> subscriber) {            if (drawingCache == null) {                subscriber.onError(new NullPointerException("imageview的bitmap获取为null,请确认imageview显示图片了"));            } else {                try {                    File imageFile = new File(Environment.getExternalStorageDirectory(), "saveImageview.jpg");                    FileOutputStream outStream;                    outStream = new FileOutputStream(imageFile);                    drawingCache.compress(Bitmap.CompressFormat.JPEG, 100, outStream);                    subscriber.onNext(Environment.getExternalStorageDirectory().getPath());                    subscriber.onCompleted();                    outStream.flush();                    outStream.close();                } catch (IOException e) {                    subscriber.onError(e);                }            }        }    }    private class SaveSubscriber extends Subscriber {        @Override        public void onCompleted() {            Toast.makeText(getApplicationContext(), "保存成功", Toast.LENGTH_SHORT).show();        }        @Override        public void onError(Throwable e) {            Log.i(getClass().getSimpleName(), e.toString());            Toast.makeText(getApplicationContext(), "保存失败——> " + e.toString(), Toast.LENGTH_SHORT).show();        }        @Override        public void onNext(String s) {            Toast.makeText(getApplicationContext(), "保存路径为：-->  " + s, Toast.LENGTH_SHORT).show();        }    }    private void saveImageView(Bitmap drawingCache) {        Observable.create(new SaveObservable(drawingCache))                .subscribeOn(Schedulers.io())                .observeOn(AndroidSchedulers.mainThread())                .subscribe(new SaveSubscriber());    }    /**     * 某些机型直接获取会为null,在这里处理一下防止国内某些机型返回null     */    private Bitmap getViewBitmap(View view) {        if (view == null) {            return null;        }        Bitmap bitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);        Canvas canvas = new Canvas(bitmap);        view.draw(canvas);        return bitmap;    }}

//不建议使用

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 {    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);    }}

stirng文件下需要的几个toast

    保存图片    保存失败    图片成功保存至%s目录

代码中引用

 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;            }        });

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