android图片查看器，实现图片加载进度监听，实现保存图片

1、添加依赖

compile 'com.github.bumptech.glide:glide:3.7.0'
compile 'com.github.chrisbanes:PhotoView:2.0.0'
compile 'com.squareup.okhttp3:okhttp:3.9.0'

2、实现fragmentactivity：

/**
 * 作者：created by meixi
 * 邮箱：[email protected]
 * 日期：2018/9/21 14
 */


public class ImagePagerActivity extends FragmentActivity {
    private static final String TAG = "ImagePagerActivity";
    private static final String STATE_POSITION = "STATE_POSITION";
    public static final String EXTRA_IMAGE_INDEX = "image_index";
    public static final String EXTRA_IMAGE_URLARRAYS = "image_urlArrays";
    private HackyViewPager mPager;
    private int pagerPosition;
    private TextView indicator;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.image_xinshi_detail_pager);
        mPager = (HackyViewPager) findViewById(R.id.vp_pager);
        indicator = (TextView) findViewById(R.id.indicator);
        initVariables();
        initEvents();
    }

    private void initVariables() {
        pagerPosition = getIntent().getIntExtra(EXTRA_IMAGE_INDEX, 0);
        ArrayList<String> urlArrays = getIntent().getStringArrayListExtra(EXTRA_IMAGE_URLARRAYS);
        ImagePagerAdapter mAdapter = new ImagePagerAdapter(getSupportFragmentManager(), urlArrays);
        mPager.setAdapter(mAdapter);
        CharSequence text = getString(R.string.viewpager_indicator, 1, mPager.getAdapter().getCount());
        indicator.setText(text);
    }

    //这块的考虑再说
    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        //   outState.putInt(STATE_POSITION, mPager.getCurrentItem());
    }

    private void initEvents() {
        // 更新下标
        mPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

            @Override
            public void onPageScrollStateChanged(int arg0) {
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
            }

            @Override
            public void onPageSelected(int arg0) {
                CharSequence text = getString(R.string.viewpager_indicator, arg0 + 1, mPager.getAdapter().getCount());
                indicator.setText(text);
            }

        });
        mPager.setCurrentItem(pagerPosition);

    }


    private class ImagePagerAdapter extends FragmentStatePagerAdapter {

        public ArrayList<String> urlArrays;

        public ImagePagerAdapter(FragmentManager fm, ArrayList<String> urlArrays) {
            super(fm);
            this.urlArrays = urlArrays;
        }

        @Override
        public int getCount() {
            return urlArrays == null ? 0 : urlArrays.size();
        }

        @Override
        public Fragment getItem(int position) {
            String url = urlArrays.get(position);
            return ImageDetailFragment.newInstance(url);

        }

    }
}

3、两个工具类：

public class ImageDetailFragment extends Fragment {
    private static final String TAG = "ImageDetailFragment";
    private String mImageUrl;
    private View rootView;
    private PhotoView mImageView;
    private ProgressBar progressBar;
    private TextView baocunte;
    private PhotoViewAttacher mAttacher;


    private String SAVE_PIC_PATH = Environment.getExternalStorageState().equalsIgnoreCase(Environment.MEDIA_MOUNTED)
            ? Environment.getExternalStorageDirectory().getAbsolutePath() : "/mnt/sdcard";//

    private String SAVE_REAL_PATH = SAVE_PIC_PATH + "/good/savePic";//保存的确
    Bitmap bitmap;


    public static ImageDetailFragment newInstance(String imageUrl) {
        final ImageDetailFragment f = new ImageDetailFragment();
        final Bundle args = new Bundle();
        args.putString("url", imageUrl);
        f.setArguments(args);
        return f;
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mImageUrl = getArguments() != null ? getArguments().getString("url") : null;

        new Thread(runnable).start();


    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        // return super.onCreateView(inflater, container, savedInstanceState);
        if (rootView == null) {
            rootView = inflater.inflate(R.layout.image_xinshi_detail_fragment, container, false);
            mImageView = (PhotoView) rootView.findViewById(R.id.image);
            progressBar = (ProgressBar) rootView.findViewById(R.id.loading);
            baocunte  =(TextView)rootView.findViewById(R.id.baochunte);
            Log.e(TAG, "onCreateView:---------------- ");
        }else {
            ViewGroup parent = (ViewGroup) rootView.getParent();
            if (parent != null) {
                parent.removeView(rootView);
            }
        }

        return rootView;
    }

    /*    策略解说：
        all:缓存源资源和转换后的资源
        none:不作任何磁盘缓存
        source:缓存源资源
        result：缓存转换后的资源*/
    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        progressBar.setVisibility(View.VISIBLE);
        Glide.with(ImageDetailFragment.this).load(mImageUrl).placeholder(R.mipmap.icon_defaultimg) // 占位图
                .error(R.mipmap.icon_errorimg)
                .diskCacheStrategy(DiskCacheStrategy.RESULT)//图片缓存模式
                .listener(new GlideRequestListener()).into(mImageView);
    }

    //glide 请求的回调
    private class GlideRequestListener implements RequestListener {

        @Override
        public boolean onException(Exception e, Object model, Target target, boolean isFirstResource) {
            Toast.makeText(getActivity(), "加载图片失败", Toast.LENGTH_SHORT).show();
            progressBar.setVisibility(View.GONE);
            return false;
        }

        //这个用于监听图片是否加载完成
        @Override
        public boolean onResourceReady(Object resource, Object model, Target target, boolean isFromMemoryCache, boolean isFirstResource) {
            mAttacher = new PhotoViewAttacher(mImageView);
            mAttacher.setOnPhotoTapListener(new OnPhotoTapListener() {
                @Override
                public void onPhotoTap(ImageView view, float x, float y) {
                    getActivity().finish();
                }
            });
            mAttacher.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View v) {
                    Log.i("Lgq","...... "+mImageUrl);
                    showNormalDialogOne();
                    Toast.makeText(getActivity(), "触发长按事件", Toast.LENGTH_SHORT).show();
                    return false;
                }
            });
            baocunte.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    try {
                        saveFile(bitmap, System.currentTimeMillis() + ".jpg");
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            });
            progressBar.setVisibility(View.GONE);
            return false;
        }
    }


    private void saveFile(Bitmap bm, String fileName) throws IOException {
        String subForder = SAVE_REAL_PATH;
        File foder = new File(subForder);
        if (!foder.exists()) foder.mkdirs();

        File myCaptureFile = new File(subForder, fileName);
        Log.v("lgq","图片保持。。。。。。。。"+myCaptureFile);
        Log.v("lgq","图片保持。。。。。getPath。。。"+myCaptureFile.getPath());
        if (!myCaptureFile.exists()) myCaptureFile.createNewFile();
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(myCaptureFile));
        bm.compress(Bitmap.CompressFormat.JPEG, 100, bos);
        bos.flush();
        bos.close();
        Toast.makeText(getContext(),"已保存在/good/savePic目录下", Toast.LENGTH_SHORT).show();
        //发送广播通知系统
        Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        Uri uri = Uri.fromFile(myCaptureFile);
        intent.setData(uri);
        getActivity().sendBroadcast(intent);
    }

    @SuppressLint("HandlerLeak")
    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            if (msg.what == 1) {

            }
        }
    };


    Runnable runnable = new Runnable() {

        @Override
        public void run() {
            try {
                bitmap = ((BitmapDrawable) loadImageFromUrl(mImageUrl)).getBitmap();
                Message msg = new Message();
                msg.what = 1;
                handler.sendMessage(msg);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    };


    private static Drawable loadImageFromUrl(String url) throws IOException {
        URL m = new URL(url);
        InputStream i = (InputStream) m.getContent();
        return Drawable.createFromStream(i, "src");
    }


    private void showNormalDialogOne() {
        /* @setIcon 设置对话框图标
         * @setTitle 设置对话框标题
         * @setMessage 设置对话框消息提示
         * setXXX方法返回Dialog对象，因此可以链式设置属性
         */
        final AlertDialog.Builder normalDialog = new AlertDialog.Builder(getContext());
        normalDialog.setTitle("提示");
        normalDialog.setMessage("确定保存图片！");
        normalDialog.setPositiveButton("确定",
                new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        try {
                            saveFile(bitmap, System.currentTimeMillis() + ".jpg");
                        } catch (IOException e) {
                            e.printStackTrace();
                        }

                        // delehistory();//dosomething
                    }
                });
        normalDialog.setNegativeButton("取消",
                new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                    }
                });
        normalDialog.show();
    }

}

、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、

public class HackyViewPager extends ViewPager {

    private static final String TAG = "HackyViewPager";

    public HackyViewPager(Context context) {
        super(context);
    }

    public HackyViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        try {
            return super.onInterceptTouchEvent(ev);
        } catch (IllegalArgumentException e) {
            // 不理会
            Log.e(TAG, "hacky viewpager error1");
            return false;
        } catch (ArrayIndexOutOfBoundsException e) {
            // 不理会
            Log.e(TAG, "hacky viewpager error2");
            return false;
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        try {
            return super.onTouchEvent(ev);
        } catch (IllegalArgumentException ex) {
            ex.printStackTrace();
        }
        return false;
    }

}

4、两个xml文件

image_xinshi_detail_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#2b2b2b">
    <com.github.chrisbanes.photoview.PhotoView
        android:id="@+id/image"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="fitCenter"/>
    <ProgressBar
        android:id="@+id/loading"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:visibility="gone"/>

    <TextView
        android:id="@+id/baochunte"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="end|bottom"
        android:textColor="@color/white"
        android:padding="20dp"
        android:text="保存" />
</FrameLayout>

/////////////////////////////////////////////////////////////////////////////////////////////////////

image_xinshi_detail_pager.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#2b2b2b"
    android:clipToPadding="true"
    android:fitsSystemWindows="true" >
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="61dp"
        android:background="@color/colorPrimary"></LinearLayout>

    <com.zscainiao.ttttppp.HackyViewPager
        android:id="@+id/vp_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@android:color/black" />

    <TextView
        android:id="@+id/indicator"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:background="@android:color/transparent"
        android:gravity="center"
        android:textColor="@android:color/white"
        android:textSize="18sp" />

</FrameLayout>

附：

<string name="viewpager_indicator">%1$d/%2$d</string>

<color name="white">#FFffff</color>

icon_defaultimg.png。占位图

icon_errorimg.png、错误图

demo链接：https://download.csdn.net/download/meixi_android/10681292