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<String> {

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<String> {

@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<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);
}
}
stirng文件下需要的几个toast

<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>

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;
}
});