Glide实现查看图片和保存图片到手机_移动开发

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Glide实现查看图片和保存图片到手机

2017/7/5 5:31:03 Panda Fang 程序员俱乐部我要评论(0)

摘要：两种方式，推荐方式一方式一downloadOnly创建一个ImageActivitypublicclassImageActivityextendsAppCompatActivity{privatestaticfinalStringTAG="ImageActivity";privateImageViewiv;Bitmapbitmap;privateStringmUrl;@OverrideprotectedvoidonCreate(BundlesavedInstanceState){super
标签：手机实现图片 ide

两种方式，推荐方式一

方式一 downloadOnly

创建一个 ImageActivity

public class ImageActivity extends AppCompatActivity {

    private static final String TAG = "ImageActivity";

    private ImageView iv;

    Bitmap bitmap;

    private String mUrl;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_image);

        iv = (ImageView) findViewById(R.id.iv);

        // 图片的url 从另一个Activity传过来
        String url = getIntent().getStringExtra(EXTRA_URL);
        mUrl = url;

        loadImage(url);

        // 长按 ImageView 把图片保存到手机

        iv.setOnLongClickListener(new View.OnLongClickListener(){
            @Override
            public boolean onLongClick(View v) {

                download(mUrl)
                return true;
            }
        });
    }

    public void loadImage(String url) {
        Glide.with(this).load(url).placeholder(R.drawable.image_loading)
            .diskCacheStrategy(DiskCacheStrategy.SOURCE)
            .listener(new RequestListener<String, GlideDrawable>() {
                @Override
                public boolean onException(Exception e, String model, Target<GlideDrawable> target, boolean isFirstResource) {

                    return false;
                }

                @Override
                public boolean onResourceReady(GlideDrawable resource, String model, Target<GlideDrawable> target, boolean isFromMemoryCache, boolean isFirstResource) {
                    Log.d(TAG, "onResourceReady: mode： " + model);

                    // 如果return true; 则 into(iv) 不起作用， 要手动设置图片
                    // iv.setImageDrawable(resource);

                    return false;
                }
            })
            .into(iv);
    }


    public void download(final String url) {

        new AsyncTask<Void, Integer, File>() {

            @Override
            protected File doInBackground(Void... params) {
                File file = null;
                try {
                    FutureTarget<File>  future = Glide
                            .with(ImageActivity.this)
                            .load(url)
                            .downloadOnly(Target.SIZE_ORIGINAL, Target.SIZE_ORIGINAL);

                    file = future.get();

                    // 首先保存图片
                    File pictureFolder = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getAbsoluteFile();

                    File appDir = new File(pictureFolder ,"Beauty");
                    if (!appDir.exists()) {
                        appDir.mkdirs();
                    }
                    String fileName = System.currentTimeMillis() + ".jpg";
                    File destFile = new File(appDir, fileName);

                    FileUtil.copy(file, destFile);

                    // 最后通知图库更新
                    sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,
                            Uri.fromFile(new File(destFile.getPath()))));


                } catch (Exception e) {
                    Log.e(TAG, e.getMessage());
                }
                return file;
            }

            @Override
            protected void onPostExecute(File file) {

                Toast.makeText(ImageActivity.this, "saved in Pictures/GankBeauty", Toast.LENGTH_SHORT).show();
            }

            @Override
            protected void onProgressUpdate(Integer... values) {
                super.onProgressUpdate(values);
            }
        }.execute();
    }
}

以上代码从另一个activity得到图片的 url ，然后使用Glide 图片加载库将图片显示到 ImageView上，长按ImageView可以将图片保存到手机的 Pictures/Beauty 目录中

这是基本的代码模板，实际情况更复杂，比如Android 6 还有运行时申请存储权限的问题。

方式二 asBitmap bitmap.compress

还有一种保存图片的方式也有很多人用，但是经过我对比发现并不好，推荐上面的方式。另一种方式的代码如下

把上面 loadImage 换成下面的 loadBitmap

    public void loadBitmap(String url) {
        Glide.with(this).load(url).asBitmap().placeholder(R.drawable.image_loading)
                .listener(new RequestListener<String, Bitmap>() {
                    @Override
                    public boolean onException(Exception e, String model, Target<Bitmap> target, boolean isFirstResource) {
                        return false;
                    }

                    @Override
                    public boolean onResourceReady(Bitmap resource, String model, Target<Bitmap> target, boolean isFromMemoryCache, boolean isFirstResource) {

                        Log.i(TAG, "onResourceReady: thread is " + Thread.currentThread().getName());
                        isReady = true;
                        bitmap = resource;
                        iv.setImageBitmap(resource);
 

                        return false;
                    }
                })
                .diskCacheStrategy(DiskCacheStrategy.ALL)
                .into(Target.SIZE_ORIGINAL, Target.SIZE_ORIGINAL);

    }

把上面的 download 换成下面的 saveImage

public void saveImage() {

        // 首先保存图片
        File file = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getAbsoluteFile();

        File appDir = new File(file ,"Beauty");
        boolean createed = false;
        if (!appDir.exists()) {
            createed =  appDir.mkdirs();
        }
        String fileName = System.currentTimeMillis() + ".jpg";
        File currentFile = new File(appDir, fileName);

        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(currentFile);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (fos != null) {
                    fos.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }


        // 最后通知图库更新
        this.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,
                Uri.fromFile(new File(currentFile.getPath()))));



    }