android.widget.Button#requestFocus ( )源码实例Demo

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_backup, container, false);

    view.findViewById(R.id.btnRestoreBackup).setOnClickListener(this);
    Button btnSaveBackup = view.findViewById(R.id.btnSaveBackup);
    btnSaveBackup.setOnClickListener(this);
    btnSaveBackup.requestFocus();
    etFilePath = view.findViewById(R.id.etPathBackup);
    PathVars pathVars = PathVars.getInstance(view.getContext());
    pathBackup = pathVars.getDefaultBackupPath();
    etFilePath.setText(pathBackup);
    etFilePath.setOnClickListener(this);
    appDataDir = pathVars.getAppDataDir();

    return view;
}
 

@Override
protected void showDialog(Bundle state) {
  super.showDialog(state);
  AlertDialog alertDialog = (AlertDialog) getDialog();
  if (alertDialog == null) {
    return;
  }

  View clear = alertDialog.findViewById(R.id.clear);
  clear.setOnClickListener(clearButtonClickListener);
  alertDialog
      .getButton(DialogInterface.BUTTON_POSITIVE)
      .setOnClickListener(okButtonClickListener);
  alertDialog.setOnKeyListener(this);

  Button okButton = alertDialog.getButton(DialogInterface.BUTTON_POSITIVE);
  okButton.setFocusableInTouchMode(true);
  okButton.requestFocus();

  setKeyEventSource(getKeyEventSourceForCurrentKeyComboModel());
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_help);

    Objects.requireNonNull(getSupportActionBar()).setDisplayHomeAsUpEnabled(true);

    etLogsPath = findViewById(R.id.etLogsPath);
    etLogsPath.setOnClickListener(this);
    Button btnSaveLogs = findViewById(R.id.btnSaveLogs);
    btnSaveLogs.setOnClickListener(this);
    btnSaveLogs.requestFocus();
    SwitchCompat swRootCommandsLog = findViewById(R.id.swRootCommandsLog);
    swRootCommandsLog.setChecked(new PrefManager(this).getBoolPref("swRootCommandsLog"));
    swRootCommandsLog.setOnCheckedChangeListener(this);

    Handler mHandler = new Handler();

    PathVars pathVars = PathVars.getInstance(this);
    appDataDir = pathVars.getAppDataDir();
    busyboxPath = pathVars.getBusyboxPath();
    pathToSaveLogs = pathVars.getDefaultBackupPath();
    iptables = pathVars.getIptablesPath();
    appUID = new PrefManager(this).getStrPref("appUID");

    br = new HelpActivityReceiver(mHandler, appDataDir, pathToSaveLogs);

    modulesStatus = ModulesStatus.getInstance();

    if (modulesStatus.isRootAvailable()) {
        IntentFilter intentFilter = new IntentFilter(RootExecService.COMMAND_RESULT);
        LocalBroadcastManager.getInstance(this).registerReceiver(br, intentFilter);
    }

}
 

@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    Button selectDirButton = findViewById(R.id.button_lbs_select_dir);
    selectDirButton.setOnClickListener(v -> selectBackupDir());
    selectDirButton.requestFocus(); //TV fix
}
 

private void initializeUi() {
    setSupportActionBar((Toolbar) findViewById(R.id.toolbar));

    // Get the Layoutelements
    mBtnConnect = (Button) findViewById(R.id.btnConnect);
    mBtnConnect.setOnClickListener(oclConnect);
    mBtnConnect.requestFocus();

    mBtnClementine = (ImageButton) findViewById(R.id.btnClementineIcon);
    mBtnClementine.setOnClickListener(oclClementine);

    // Setup the animation for the Clementine icon
    mAlphaDown = new AlphaAnimation(1.0f, 0.3f);
    mAlphaUp = new AlphaAnimation(0.3f, 1.0f);
    mAlphaDown.setDuration(ANIMATION_DURATION);
    mAlphaUp.setDuration(ANIMATION_DURATION);
    mAlphaDown.setFillAfter(true);
    mAlphaUp.setFillAfter(true);
    mAlphaUp.setAnimationListener(mAnimationListener);
    mAlphaDown.setAnimationListener(mAnimationListener);
    mAnimationCancel = false;

    // Ip and Autoconnect
    mEtIp = (AutoCompleteTextView) findViewById(R.id.etIp);
    mEtIp.setRawInputType(InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
    mEtIp.setThreshold(3);

    // Get old ip and auto-connect from shared prefences
    mEtIp.setText(mSharedPref.getString(SharedPreferencesKeys.SP_KEY_IP, ""));
    mEtIp.setSelection(mEtIp.length());

    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
            android.R.layout.select_dialog_item, mKnownIps.toArray(new String[0]));
    mEtIp.setAdapter(adapter);

    // Get the last auth code
    mAuthCode = mSharedPref.getInt(SharedPreferencesKeys.SP_LAST_AUTH_CODE, 0);
}
 

private static void focusCancelButton(AlertDialog alertDialog) {
  Button cancelButton = alertDialog.getButton(AlertDialog.BUTTON_NEGATIVE);
  cancelButton.setFocusableInTouchMode(true);
  cancelButton.requestFocus();
}