点击查看大图（长按保存图片）

最近做项目时有需求，我就在参考原博客（点击查看大图原博客链接）后自己又添加方法，最终实现了长按图片获取原图url以后，自动保存图片到本地。

界面是这个样子的：

下面附上关键部分的代码：

@Overridepublic void onClickable(int viewId) {switch (viewId) {case R.id.iv_download://点击下载按钮进行下载保存操作new Thread(new Runnable() {@Overridepublic void run() {//网络请求放到子线程final Bitmap b = returnBitmap(imgPath);if (b != null) {runOnUiThread(new Runnable() {@Overridepublic void run() {saveImgToLocal(b);}});}}}).start();break;}}/*** 根据图片的url路径获得Bitmap对象** @param url* @return*/private Bitmap returnBitmap(String url) {URL fileUrl = null;Bitmap bitmap = null;try {fileUrl = new URL(url);} catch (MalformedURLException e) {e.printStackTrace();}try {HttpURLConnection conn = (HttpURLConnection) fileUrl.openConnection();conn.setDoInput(true);conn.connect();InputStream is = conn.getInputStream();bitmap = BitmapFactory.decodeStream(is);is.close();} catch (IOException e) {e.printStackTrace();}return bitmap;}

  /*** 保存Bitmap图片对象** @param bitmap*/private void saveImgToLocal(Bitmap bitmap) {FileUtils.savePhoto(this, bitmap, new FileUtils.SaveResultCallback() {@Overridepublic void onSavedSuccess() {runOnUiThread(new Runnable() {@Overridepublic void run() {//保存成功后弹出一个提示框Dialog dialog = new DialogUtils(ShowWebImageActivity.this);dialog.setContentView(R.layout.dialog_download_success);dialog.show();}});}@Overridepublic void onSavedFailed() {runOnUiThread(new Runnable() {@Overridepublic void run() {//保存失败后弹出一个提示框Dialog dialog = new DialogUtils(ShowWebImageActivity.this);dialog.setContentView(R.layout.dialog_download_failure);dialog.show();}});}});}

FileUtils工具类

package com.test.wwy.utils;import android.app.Activity;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v4.app.ActivityCompat;
import android.util.Log;import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;public class FileUtils {private Context mContext;private String TAG = "FileUtils";/*** sd卡的根目录*/private static String mSdRootPath = Environment.getExternalStorageDirectory().getPath();/*** 手机的缓存根目录*/private static String mDataRootPath = null;/*** 保存Image的目录名*/private final static String FOLDER_NAME = "/AndroidImage";/*** 图文详情图片缓存*/private final static String IMAGE_RICHTEXT = "/RichTextImage";public FileUtils(Context context) {mContext = context;mDataRootPath = context.getCacheDir().getPath();}/*** 获取手机根目录，若有SD卡就是SD卡根目录，否则为手机缓存目录** @return*/public String getRootDirectory() {return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED) ? mSdRootPath : mDataRootPath;}/*** 获取储存Image的目录** @return*/public String getStorageDirectory() {return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED) ? mSdRootPath + FOLDER_NAME: mDataRootPath + FOLDER_NAME;}public String getRichTextImageDirectory() {return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED) ? mSdRootPath + IMAGE_RICHTEXT: mDataRootPath + IMAGE_RICHTEXT;}/*** @param fileName* @param bitmap* @return 保存的图片的路径*/public String savaRichTextImage(String fileName, Bitmap bitmap) {fileName = fileName.replaceAll("[^\\w]", "");if (bitmap == null) {return null;}String result = null;String path = getRichTextImageDirectory();File folderFile = new File(path);if (!folderFile.exists()) {folderFile.mkdirs();}File file = new File(path + File.separator + fileName + ".jpg");if (file.exists()) {file.delete();}try {file.createNewFile();FileOutputStream fos = new FileOutputStream(file);bitmap.compress(CompressFormat.JPEG, 100, fos);fos.flush();fos.close();result = file.getAbsolutePath();} catch (FileNotFoundException e) {e.printStackTrace();Log.i(TAG, "savaImage() has FileNotFoundException");} catch (IOException e) {e.printStackTrace();Log.i(TAG, "savaImage() has IOException");}return result;}public void deleteRichTextImage() {String path = getRichTextImageDirectory();File f = new File(path);deleteFile(f);}public void deleteFile(File file) {if (file.isFile()) {file.delete();return;}if (file.isDirectory()) {File[] childFile = file.listFiles();if (childFile == null || childFile.length == 0) {file.delete();return;}for (File f : childFile) {deleteFile(f);}file.delete();}}/*** 根据Uri获取图片文件的绝对路径*/public String getFilePathFromUri(final Uri uri) {if (null == uri) {return null;}final String scheme = uri.getScheme();String data = null;if (scheme == null) {data = uri.getPath();} else if (ContentResolver.SCHEME_FILE.equals(scheme)) {data = uri.getPath();} else if (ContentResolver.SCHEME_CONTENT.equals(scheme)) {Cursor cursor = mContext.getContentResolver().query(uri,new String[]{MediaStore.Images.ImageColumns.DATA}, null,null, null);if (null != cursor) {if (cursor.moveToFirst()) {int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);if (index > -1) {data = cursor.getString(index);}}cursor.close();}}return data;}public static void checkForPermission(Context mContext) {/*** 动态获取权限，Android 6.0 新特性，一些保护权限，除了要在AndroidManifest中声明权限，还要使用如下代码动态获取*/if (Build.VERSION.SDK_INT >= 23) {int REQUEST_EXTERNAL_STORAGE = 1;String[] PERMISSIONS_STORAGE = {android.Manifest.permission.READ_EXTERNAL_STORAGE,android.Manifest.permission.WRITE_EXTERNAL_STORAGE};int permission = ActivityCompat.checkSelfPermission(mContext, android.Manifest.permission.WRITE_EXTERNAL_STORAGE);if (permission != PackageManager.PERMISSION_GRANTED) {// We don't have permission so prompt the userActivityCompat.requestPermissions((Activity) mContext,PERMISSIONS_STORAGE,REQUEST_EXTERNAL_STORAGE);}}}/*** 保存图片到本地*/public static void savePhoto(final Context context, final Bitmap bmp, final String imgUrl, final SaveResultCallback saveResultCallback) {final File sdDir = getSDPath();if (sdDir == null) {T.showShort(context, "设备自带的存储不可用");return;}new Thread(new Runnable() {@Overridepublic void run() {File appDir = new File(sdDir, "CollegeDaily_Photo");if (!appDir.exists()) {appDir.mkdirs();}
//              SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");//设置以当前时间格式为图片名称
//              String fileName = df.format(new Date()) + ".png";String fileName = MD5Utils.stringToMd5(imgUrl) + ".png";//设置以当前url为图片名称File file = new File(appDir.getPath(), fileName);try {FileOutputStream fos = new FileOutputStream(file);bmp.compress(CompressFormat.PNG, 100, fos);fos.flush();fos.close();saveResultCallback.onSavedSuccess();} catch (FileNotFoundException e) {saveResultCallback.onSavedFailed();e.printStackTrace();} catch (IOException e) {saveResultCallback.onSavedFailed();e.printStackTrace();}//保存图片后发送广播通知更新数据库Uri uri = Uri.fromFile(file);context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, uri));}}).start();}public static File getSDPath() {File sdDir = null;boolean sdCardExist = Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED); //判断sd卡是否存在if (sdCardExist) {sdDir = Environment.getExternalStorageDirectory();//获取跟目录}return sdDir;}public interface SaveResultCallback {void onSavedSuccess();void onSavedFailed();}/*** 复制图片到本地* @param context* @param oldpath* @param localPath*/public static void copyPhotoToLocal(Context context,String oldpath,String localPath){try {int bytesum = 0;int byteread = 0;File oldfile = new File(oldpath);if (oldfile.exists()) { //文件存在时InputStream inStream = new FileInputStream(oldpath); //读入原文件FileOutputStream fs = new FileOutputStream(localPath);byte[] buffer = new byte[1444];int length;while ( (byteread = inStream.read(buffer)) != -1) {bytesum += byteread; //字节数 文件大小System.out.println(bytesum);fs.write(buffer, 0, byteread);}inStream.close();//保存图片后发送广播通知更新数据库Uri uri = Uri.fromFile(new File(localPath));context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, uri));}}catch (Exception e) {e.printStackTrace();}}
}

最后欢迎大家评论并及时与我交流学习！

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