Android：隐藏其他活动的按钮 [英] Android: Hide button from another activity

问题描述

我有2个活动。最初，第一个活动中的按钮是不可见的。我想要的是，当我在第二个活动中单击一个按钮时，第一个活动中的按钮应该可见。

I have 2 activities. Initially the button in first activity is invisible. What I want is that when I click a button in the second activity then the button in my first activity should become visible.

这是我到目前为止的第二个活动代码。 / p>

This is my second activity code till now.

this.promodeimage.setOnClickListener(new OnClickListener() {
    public void onClick(View view) {
        ///What should i do in here 
     }
});

推荐答案

做一件事！这很容易..只需在您的第一个活动中将按钮设置为public static

public class Activity_One extends Activity {

public static Button btnOne ;

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


       btnOne = (Button) findViewById(R.id.btnOne);
}

现在，您需要做的就是通过第二项活动访问它使用第一个活动的类名，即Activity_One.btnOne

Now all you need to do is that from Second Activity just access it using the class name of the first activity i.e Activity_One.btnOne

public class Activity_Two extends Activity {

     Button btnTwo ;

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


           btnTwo = (Button) findViewById(R.id.btnTwo);

btnTwo.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Activity_One.btnOne.setVisibility(View.GONE);
            }
        });
    }

让我知道这是否对您有用！ ：）

Let me know if this works for you ! :)

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