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第一次按下“编辑信息”按钮时没有任何反应,但随后它工作正常。有很多类似的问题,我已经通过并尝试了我所能做的一切,但没有成功。

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        sharedPrefs = getSharedPreferences(USER_PREFERENCES, MODE_PRIVATE);
    //call function to load previous values, no intteraction with button



        final Button myButton = findViewById(R.id.button);
        myButton.setTag(1);
        myButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final int status =(Integer) v.getTag();
                if(status == 1) {
                    myButton.setText(getString(R.string.edit_info));
                    setEditable(false);
                    v.setTag(0);
                } else {
                    myButton.setText(getString(R.string.save_info));
                    setEditable(true);
                    v.setTag(1);
                }
            }

        });
       //proposed solution from other question, see note bellow (*)    
        myButton.setOnTouchListener(new View.OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                if (event.getAction() == MotionEvent.ACTION_UP && !v.hasFocus()) {
                    // onClick() is not called when the EditText doesn't have focus,
                    // onFocusChange() is called instead, which might have a different
                    // meaning. This condition calls onClick() when click was performed
                    // but wasn't reported. Condition can be extended for v.isClickable()
                    // or v.isEnabled() if needed. Returning false means that everything
                    // else behaves as before.
                    myButton.performClick();
                }
                return false;
            }
        });
    }

(*) 从这个问题Matěj Hrazdíra 建议添加 OnTouchListner 但这样做会使按钮永远不会切换回来。

这是activity_main.xml

<Button
    android:id="@+id/button"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:clickable="true"
    android:focusable="false"
    android:focusableInTouchMode="false"
    android:text="@string/edit_info" />
4

1 回答 1

1

从 xml 按钮已经有文本"@string/edit_info"
onCreate()您将其标记设置为 1。因此侦听器将执行:

            myButton.setText(getString(R.string.edit_info));
            setEditable(false);
            v.setTag(0);

所以文本不会改变。
之后,随后的单击将更改其文本。
我不知道你到底想要什么,但如果onCreate()你将它的标签设置为 0,你会看到第一次点击的变化。

于 2018-08-21T08:09:10.157 回答