Android：如何打开系统相册

Android

版本：1
作者：陈小默
声明：允许规范转载

1，打开相册

/**
 * 打开相机
 */
private val CAMERA = 1
/**
 * 打开相册
 */
private val ALBUM = 2
/**
 * 上传头像
 */
private val UPLOAD = 3

val intent = Intent(Intent.ACTION_PICK, null)
intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*")
startActivityForResult(intent, ALBUM)

2，打开相机

val intent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(temp)) //保存拍照后的相片到temp文件
startActivityForResult(intent, CAMERA)

3，获取结果

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        when (requestCode) {
            CAMERA -> {
                if (resultCode == Activity.RESULT_OK) crop(Uri.fromFile(temp))
            }
            ALBUM -> {
                if (resultCode == Activity.RESULT_OK) crop(data!!.data)
            }
            UPLOAD -> {
                if (data != null && data.extras != null) {
                    val extras = data.extras
                    val head: Bitmap = extras.getParcelable("data")
                    ...
                }
            }
            else -> {
            }
        }
    }

4，打开裁剪

    /**
     * 打开系统裁剪页面
     */
    private fun crop(uri: Uri) {
        val intent = Intent("com.android.camera.action.CROP")
        with(intent) {
            setDataAndType(uri, "image/*")
            putExtra("crop", "true")
            putExtra("aspectX", 1)          // aspectX aspectY 是宽高的比例
            putExtra("aspectY", 1)
            intent.putExtra("outputX", 150) // outputX outputY 是裁剪图片宽高
            intent.putExtra("outputY", 150)
            intent.putExtra("return-data", true)
        }
        view.startActivityForResult(intent, UPLOAD)
    }