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String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE};
ActivityCompat.requestPermissions(OkHttpTest.this, permissions, REQUEST_CODE_CONTACT);
if (ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
Log.i("asdfg", "没有权限!");
}