[英]Convert selected image into base64 string in Android (Java)
按鈕單擊打開相機,拍照並嘗試將所選圖片轉換為 base64 字符串但不起作用。 請檢查下面的代碼。
private static final int CAMERA_PIC_REQUEST = 1337;
Button upload;
@Override
protected void onCreate(Bundle savedInstanceState) {
upload = findViewById(R.id.upload);
upload.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_PIC_REQUEST);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == CAMERA_PIC_REQUEST && resultCode == RESULT_OK) {
Bitmap image = (Bitmap) data.getExtras().get("data");
ImageView imageview = (ImageView) findViewById(R.id.uploadimage);
imageview.setImageBitmap(image);
String directoryPath = Environment.getExternalStorageDirectory() + "/";
String filePath = directoryPath+Long.toHexString(System.currentTimeMillis())+".png";
File directory = new File(directoryPath);
if (!directory.exists()) {
directory.mkdirs();
}
System.out.print(filePath);
System.out.print(Uri.fromFile( new File(filePath) ));
File imageFile = new File(filePath);
Bitmap bitmap = BitmapFactory.decodeFile(imageFile.getAbsolutePath());
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 90, stream);
byte[] image1 = stream.toByteArray();
String img_str = Base64.encodeToString(image1, 0);
}
我在下面的代碼中將靜態圖像轉換為 base64 字符串,但我想拍照並轉換為 base64 字符串。
Bitmap bitmapOrg = BitmapFactory.decodeResource(getResources(), R.drawable.testimage);
ByteArrayOutputStream bao = new ByteArrayOutputStream();
bitmapOrg.compress(Bitmap.CompressFormat.PNG, 100, bao);
byte [] ba = bao.toByteArray();
String ba1=Base64.encodeToString(ba,Base64.DEFAULT);
System.out.print(ba1);
請按照此獲取實際圖像。
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == CAMERA_PIC_REQUEST && resultCode == RESULT_OK) {
Bitmap photo = (Bitmap) data.getExtras().get("data");
String imgString = toBase64(photo);
}
}
public String toBase64(Bitmap bm) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.JPEG, 100, baos); //bm is the bitmap object
byte[] b = baos.toByteArray();
return Base64.encodeToString(b, Base64.NO_WRAP);
}
我的理解是,你需要對拍攝的照片做兩件事:
要做這兩件事,你不需要在你自己的代碼中編寫圖片文件。 您已經使用以下代碼獲得了來自相機的位圖:
Bitmap pictureFromCamera = (Bitmap) data.getExtras().get("data");
現在只需使用
imageView.setImageBitmap(pictureFromCamera)
要將其轉換為 base64,只需將pictureFromCamera轉換為 base64 即可
String base64StringOfCameraPic = getBase64StringFromBitmap(pictureFromCamera , 100)
String getBase64StringFromBitmap(Bitmap bitmap, int quality)
{
if (bitmap == null || quality < 0)
{
return null;
} else
{
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, quality, byteArrayOutputStream);
byte[] byteArray = byteArrayOutputStream.toByteArray();
return Base64.encodeToString(byteArray, Base64.DEFAULT);
}
}
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