LoginActivity.java

@Override
protected void onResume() {
    super.onResume();

    addCallback();
    enableLoginBtnClick = true;
    StringBuffer version = new StringBuffer("" + AGApplication.the().getmAgoraAPI().getSdkVersion());

    if (version.length() >= 8) {
        String strVersion = "version " + version.charAt(2) + "." + version.charAt(4) + "." + version.charAt(6);
        textViewVersion.setText(strVersion);
    }
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == REQUEST_CODE && resultCode == RESULT_OK) {
        if (data != null && data.getStringExtra("result").equals("finish")) {
            finish();
        }

    }
}

@Override
public void onBackPressed() {
    AGApplication.the().getmAgoraAPI().logout();
    Constant.cleanMessageListBeanList();
    super.onBackPressed();
}

public void onClickFinish(View v) {
    AGApplication.the().getmAgoraAPI().logout();
    /** logout clear messagelist**/
    Constant.cleanMessageListBeanList();
    finish();
}