Android 获取drawable目录图片 并存入指定文件的步骤详解

第一步：获取存储的路径 我们用/sdcard/Android/data/包名/的路径 方便我们测试查看

String path=MyApplication.getContextObject().getExternalFilesDir("").toString();
File file=new File(path);

第二步：根据该文件中存储的路径信息在文件系统上创建一个新的空文件

File finalImageFile = new File(file, System.currentTimeMillis() + ".jpg");
try {
  finalImageFile.createNewFile();
} catch (IOException e) {
  e.printStackTrace();
}

第三步：将字节放入文件输出流

FileOutputStream fos = null;
try {
  fos = new FileOutputStream(finalImageFile);
} catch (FileNotFoundException e) {
  e.printStackTrace();
}

第四步：将图片压缩成图片格式

BitmapDrawable bitmapDrawable = (BitmapDrawable)MyApplication.getContextObject().getResources().getDrawable(R.drawable.account);
Bitmap bitmap=bitmapDrawable.getBitmap();
if (bitmap == null) {
  Toast.makeText(MyApplication.getContextObject(), "图片不存在",Toast.LENGTH_LONG).show();
  return;
}
bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
try {
  fos.flush();
  fos.close();
  Toast.makeText(MyApplication.getContextObject(), "图片保存在："+ finalImageFile.getAbsolutePath(), Toast.LENGTH_LONG).show();
} catch (IOException e) {
  e.printStackTrace();
}

完整代码

String path=MyApplication.getContextObject().getExternalFilesDir("").toString();
File file=new File(path);

File finalImageFile = new File(file, System.currentTimeMillis() + ".jpg");
try {
  finalImageFile.createNewFile();
} catch (IOException e) {
  e.printStackTrace();
}

FileOutputStream fos = null;
try {
  fos = new FileOutputStream(finalImageFile);
} catch (FileNotFoundException e) {
  e.printStackTrace();
}

BitmapDrawable bitmapDrawable = (BitmapDrawable)MyApplication.getContextObject().getResources().getDrawable(R.drawable.account);
Bitmap bitmap=bitmapDrawable.getBitmap();
if (bitmap == null) {
  Toast.makeText(MyApplication.getContextObject(), "图片不存在",Toast.LENGTH_LONG).show();
  return;
}
bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
try {
  fos.flush();
  fos.close();
  Toast.makeText(MyApplication.getContextObject(), "图片保存在："+ finalImageFile.getAbsolutePath(), Toast.LENGTH_LONG).show();
} catch (IOException e) {
  e.printStackTrace();
}

来源：https://blog.csdn.net/weixin_42362496/article/details/105157631