日本免费高清视频-国产福利视频导航-黄色在线播放国产-天天操天天操天天操天天操|www.shdianci.com

學(xué)無先后，達(dá)者為師

網(wǎng)站首頁 編程語言 正文

Android開發(fā)之保存圖片到相冊(cè)的三種方法詳解_Android

作者：xiayiye5 ? 更新時(shí)間： 2022-06-12 編程語言

有三種方法如下：三個(gè)方法都需要?jiǎng)討B(tài)申請(qǐng)讀寫權(quán)限否則保存圖片到相冊(cè)也會(huì)失敗

方法一

 /**
     * 保存bitmap到本地
     *
     * @param bitmap Bitmap
     */
    public static void saveBitmap(Bitmap bitmap, String path) {
        String savePath;
        File filePic;
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            savePath = path;
        } else {
            Log.e("tag", "saveBitmap failure : sdcard not mounted");
            return;
        }
        try {
            filePic = new File(savePath);
            if (!filePic.exists()) {
                filePic.getParentFile().mkdirs();
                filePic.createNewFile();
            }
            FileOutputStream fos = new FileOutputStream(filePic);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
            fos.flush();
            fos.close();
        } catch (IOException e) {
            Log.e("tag", "saveBitmap: " + e.getMessage());
            return;
        }
        Log.i("tag", "saveBitmap success: " + filePic.getAbsolutePath());
    }

方法二

針對(duì)小于API29以下方法，此方法會(huì)通知圖庫更新

 
    /**
     * API 29及以下保存圖片到相冊(cè)的方法
     *
     * @param toBitmap 要保存的圖片
     */
    private void saveImage(Bitmap toBitmap) {
        String insertImage = MediaStore.Images.Media.insertImage(getContentResolver(), toBitmap, "壁紙", "搜索貓相關(guān)圖片后保存的圖片");
        if (!TextUtils.isEmpty(insertImage)) {
            Toast.makeText(this, "圖片保存成功!" + insertImage, Toast.LENGTH_SHORT).show();
            Log.e("打印保存路徑", insertImage + "-");
        }
    }

方法三

針對(duì)大于API29以下方法，此方法也會(huì)通知圖庫更新

  /**
     * API29 中的最新保存圖片到相冊(cè)的方法
     */
    private void saveImage29(Bitmap toBitmap) {
        //開始一個(gè)新的進(jìn)程執(zhí)行保存圖片的操作
        Uri insertUri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, new ContentValues());
        //使用use可以自動(dòng)關(guān)閉流
        try {
            OutputStream outputStream = getContentResolver().openOutputStream(insertUri, "rw");
            if (toBitmap.compress(Bitmap.CompressFormat.JPEG, 90, outputStream)) {
                Log.e("保存成功", "success");
            } else {
                Log.e("保存失敗", "fail");
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

上面方法二和方法三是java的寫法，kotlin寫法如下

package com.xiayiye.jetpackstudy.gallery


import android.Manifest
import android.content.ContentValues
import android.content.pm.PackageManager
import android.graphics.Bitmap
import android.os.Build
import android.os.Bundle
import android.provider.MediaStore
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Toast
import androidx.core.content.ContextCompat
import androidx.core.graphics.drawable.toBitmap
import androidx.core.view.get
import androidx.fragment.app.Fragment
import androidx.lifecycle.lifecycleScope
import androidx.recyclerview.widget.RecyclerView
import androidx.viewpager2.widget.ViewPager2
import com.xiayiye.jetpackstudy.R
import kotlinx.android.synthetic.main.fragment_view_pager2_image.*
import kotlinx.android.synthetic.main.pager_photo_view.view.*
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.MainScope
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext

/**
 * 顯示輪播大圖和保存圖片的頁面
 */

class ViewPager2ImageFragment : Fragment() {
    companion object {
        const val REQUEST_WRITE_EXTERNAL_STORAGE_CODE = 1000
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.fragment_view_pager2_image, container, false)
    }

    override fun onActivityCreated(savedInstanceState: Bundle?) {
        super.onActivityCreated(savedInstanceState)
        val photoList = arguments?.getParcelableArrayList<PhotoItem>("photo_list")
        val currentPosition = arguments?.getInt("photo_position", 0)
        PagerPhotoListAdapter().apply {
            vp2Banner.adapter = this
            submitList(photoList)
        }
        //設(shè)置輪播圖片后的滑動(dòng)當(dāng)前頁
        vp2Banner.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() {
            override fun onPageSelected(position: Int) {
                super.onPageSelected(position)
                tvShowImagePage.text =
                    StringBuffer().append(position + 1).append("/").append(photoList?.size)
            }
        })
        //設(shè)置 ViewPager2 的當(dāng)前頁要在設(shè)置 ViewPager2 的數(shù)據(jù)后在設(shè)置當(dāng)前頁面,否則不生效
        vp2Banner.setCurrentItem(currentPosition ?: 0, false)
        //設(shè)置縱向滾動(dòng)的方法
        vp2Banner.orientation = ViewPager2.ORIENTATION_VERTICAL
        //保存圖片的方法
        ivSaveImg.setOnClickListener {
            if (Build.VERSION.SDK_INT < 29 && ContextCompat.checkSelfPermission(
                    requireContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE
                ) != PackageManager.PERMISSION_GRANTED
            ) {
                requestPermissions(
                    arrayOf<String>(Manifest.permission.WRITE_EXTERNAL_STORAGE),
                    REQUEST_WRITE_EXTERNAL_STORAGE_CODE
                )
            } else {
                viewLifecycleOwner.lifecycleScope.launch { saveImage29() }
            }
        }
    }

    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        if (requestCode == REQUEST_WRITE_EXTERNAL_STORAGE_CODE && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            //權(quán)限申請(qǐng)成功可以保存圖片
            viewLifecycleOwner.lifecycleScope.launch { saveImage29() }
        }
    }

    /**
     * 保存圖片到相冊(cè)的方法
     *  API29 后此方法已廢棄
     */
    private fun saveImage() {
        val holder =
            (vp2Banner[0] as RecyclerView).findViewHolderForAdapterPosition(vp2Banner.currentItem) as PagerPhotoListAdapter.PagerPhotoViewHolder
        val toBitmap = holder.itemView.ivPagerView.drawable.toBitmap()
        val insertImage = MediaStore.Images.Media.insertImage(
            requireActivity().contentResolver, toBitmap, "壁紙", "搜索貓相關(guān)圖片后保存的圖片"
        )
        if (insertImage.isNotEmpty()) {
            Toast.makeText(requireActivity(), "圖片保存成功！-${insertImage}", Toast.LENGTH_SHORT).show()
        } else {
            Toast.makeText(requireActivity(), "圖片保存失敗！}", Toast.LENGTH_SHORT).show()
        }
    }

    /**
     * API29 中的最新保存圖片到相冊(cè)的方法
     */
    private suspend fun saveImage29() {
        //開始一個(gè)新的進(jìn)程執(zhí)行保存圖片的操作
        withContext(Dispatchers.IO) {
            val holder =
                (vp2Banner[0] as RecyclerView).findViewHolderForAdapterPosition(vp2Banner.currentItem) as PagerPhotoListAdapter.PagerPhotoViewHolder
            val toBitmap = holder.itemView.ivPagerView.drawable.toBitmap()
            val insertUri = requireActivity().contentResolver.insert(
                MediaStore.Images.Media.EXTERNAL_CONTENT_URI, ContentValues()
            ) ?: kotlin.run {
                showSaveToast("保存失敗！")
                return@withContext
            }
            //使用use可以自動(dòng)關(guān)閉流
            requireActivity().contentResolver.openOutputStream(insertUri).use {
                if (toBitmap.compress(Bitmap.CompressFormat.JPEG, 90, it)) {
                    showSaveToast("保存成功！")
                } else {
                    showSaveToast("保存失敗！")
                }
            }
        }
    }

    /**
     * 顯示保存圖片結(jié)果的方法
     */
    private fun showSaveToast(showMsg: String) =
        MainScope().launch {
            Toast.makeText(requireActivity(), showMsg, Toast.LENGTH_SHORT).show()
        }
}

原文鏈接：https://blog.csdn.net/xiayiye5/article/details/115251706

欄目分類
最近更新