启用应用程序锁定APP的活动

Question

开发应用程序以获取安装的APPS列表，其中两个按钮是启用密码，其他是更改密码，如果应用程序未锁定，则更改密码按钮将被隐藏，当我单击按钮时我无法获取密码选项，

 @Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);


    btOnOff = (Button) findViewById(R.id.bt_on_off);

    btOnOff.setText(R.string.enable_passcode);
    btOnOff.setOnClickListener(this);

    btChange = (Button) findViewById(R.id.bt_change);
    btChange.setText(R.string.change_passcode);
    btChange.setOnClickListener(this);

     update();


    packageManager = getPackageManager();
    List<PackageInfo> packageList = packageManager
            .getInstalledPackages(PackageManager.GET_PERMISSIONS);

    List<PackageInfo> packageList1 = new ArrayList<PackageInfo>();

    }
    apkList = (ListView) findViewById(R.id.applist);
    apkList.setAdapter(new ApkAdapter(this, packageList1, packageManager));
}


@Override
public void onClick(View view) {

    if (view.equals(btOnOff)) {
        int type = LockManager.getInstance().getAppLock().isPasscodeSet() ? AppLock.DISABLE_PASSLOCK
                : AppLock.ENABLE_PASSLOCK;
        Intent intent = new Intent(this, AppLockActivity.class);
        intent.putExtra(AppLock.TYPE, type);
        startActivityForResult(intent, type);

    } else if (view.equals(btChange)) {
        Intent intent = new Intent(this, AppLockActivity.class);
        intent.putExtra(AppLock.TYPE, AppLock.CHANGE_PASSWORD);
        intent.putExtra(AppLock.MESSAGE,
                getString(R.string.enter_old_passcode));
        startActivityForResult(intent, AppLock.CHANGE_PASSWORD);

    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    switch (requestCode) {
    case AppLock.DISABLE_PASSLOCK:
        break;
    case AppLock.ENABLE_PASSLOCK:
    case AppLock.CHANGE_PASSWORD:
        if (resultCode == RESULT_OK) {
            Toast.makeText(this, getString(R.string.setup_passcode),
                    Toast.LENGTH_SHORT).show();
        }
        break;
    default:
        break;
    }
    updateUI();
}
private void updateUI() {
    if (LockManager.getInstance().getAppLock().isPasscodeSet()) {
        btOnOff.setText(R.string.disable_passcode);
        btChange.setEnabled(true);
    } else {
        btOnOff.setText(R.string.enable_passcode);
        btChange.setEnabled(false);
    }
}

} 以什么方式我必须为两个按钮设置clicklistener？

这是错误

我无法开始活动。如果这是错误的，请以不同的方式建议我