安卓下将网络图片保存到相册

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本文链接： https://blog.csdn.net/yuhang01/article/details/100987441

这是我所见过的堪称最最最最简单的将图片保存到相册中的方法Plus
废话不多说，直接撸代码

1.对于权限的注册

   <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />  
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.INTERNET"/>

安卓6.0以后一定要加读写权限的判断 否则是保存不了的 这是重点
2.工具类

public class DonwloadSaveImg {
    private static Context context;
    private static String filePath;
    private static Bitmap mBitmap;
    private static String mSaveMessage = "失败";
    private final static String TAG = "PictureActivity";
    private static ProgressDialog mSaveDialog = null;

    public static void donwloadImg(Context contexts, String filePaths) {
        context = contexts;
        filePath = filePaths;
        mSaveDialog = ProgressDialog.show(context, "保存图片", "图片正在保存中，请稍等...", true);
        new Thread(saveFileRunnable).start();
    }

    private static Runnable saveFileRunnable = new Runnable() {
        @Override
        public void run() {
            try {
                if (!TextUtils.isEmpty(filePath)) { //网络图片
                    // 对资源链接
                    URL url = new URL(filePath);
                    //打开输入流
                    InputStream inputStream = url.openStream();
                    //对网上资源进行下载转换位图图片
                    mBitmap = BitmapFactory.decodeStream(inputStream);
                    inputStream.close();
                }
                saveFile(mBitmap);
                mSaveMessage = "图片保存成功！";
            } catch (IOException e) {
                mSaveMessage = "图片保存失败！";
                e.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
            }
            messageHandler.sendMessage(messageHandler.obtainMessage());
        }
    };

    private static Handler messageHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            mSaveDialog.dismiss();
            Log.d(TAG, mSaveMessage);
            Toast.makeText(context, mSaveMessage, Toast.LENGTH_SHORT).show();
        }
    };
    /**
     * 保存图片
     * @param bm
     * @throws IOException
     */
    public static void saveFile(Bitmap bm ) throws IOException {
        File dirFile = new File(Environment.getExternalStorageDirectory().getPath());
        if (!dirFile.exists()) {
            dirFile.mkdir();
        }
        String fileName = UUID.randomUUID().toString() + ".jpg";
        File myCaptureFile = new File(Environment.getExternalStorageDirectory().getPath() + "/DCIM/Camera/" + fileName);
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(myCaptureFile));
        bm.compress(Bitmap.CompressFormat.JPEG, 80, bos);
        bos.flush();
        bos.close();
        //把图片保存后声明这个广播事件通知系统相册有新图片到来
        Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        Uri uri = Uri.fromFile(myCaptureFile);
        intent.setData(uri);
        context.sendBroadcast(intent);
    }

3.主活动中权限的判断以及保存图片

public class Main2Activity extends AppCompatActivity {

    private static int REQUEST_PERMISSION_CODE = 1;
    private String path="https://www.baidu.com/img/bd_logo1.png?where=super";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        checkPermission();
    }

    private void checkPermission() {
        //检查权限（NEED_PERMISSION）是否被授权 PackageManager.PERMISSION_GRANTED表示同意授权
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED) {
            //用户已经拒绝过一次，再次弹出权限申请对话框需要给用户一个解释
            if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission
                    .WRITE_EXTERNAL_STORAGE)) {
                Toast.makeText(this, "请开通相关权限，否则无法正常使用本应用！", Toast.LENGTH_SHORT).show();
            }
            //申请权限
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_PERMISSION_CODE);

        } else {
            Toast.makeText(this, "授权成功！", Toast.LENGTH_SHORT).show();
            Log.e("aaaaa", "checkPermission: 已经授权！");
        }
    }


    public void write(View view) {   //按钮的点击事件
        DonwloadSaveImg.donwloadImg(Main2Activity.this,path);//iPath
    }
}

大功告成！！！！！！希望能够对你有用
反正我是亲测有效