blocks|key|5900015|text|您需要使用ViewTreeObserver|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|5900016|++++ViewTreeObserver+vto+=+mybutton.getViewTreeObserver();
++++vto.addOnGlobalLayoutListener(new+OnGlobalLayoutListener()+{
++++++++@Override
++++++++public+void+onGlobalLayout()+{
++++++++++++vto.removeOnGlobalLayoutListener(this);
++++++++++++mybutton.performClick();
++++++++}
++++});|code-block|syntax|javascript|5900017|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/reference/android/view/ViewTreeObserver.html^0|5|G|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

You need to use a <a href="http://developer.android.com/reference/android/view/ViewTreeObserver.html" rel="nofollow">ViewTreeObserver</a>:

<pre><code> ViewTreeObserver vto = mybutton.getViewTreeObserver();
 vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
 @Override
 public void onGlobalLayout() {
 vto.removeOnGlobalLayoutListener(this);
 mybutton.performClick();
 }
 });
</code></pre>

blocks|key|5417816|text|在一个类似的案例中，这对我很有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5417817|mybutton.post(new+Runnable(){
++++++++++++@Override
++++++++++++public+void+run()+{
+++++++++++++++++mybutton.performClick();
++++++++++++}
});|code-block|syntax|javascript|5417818|这样，只有当按钮已经加载到布局中时，runnable才会运行。|5417819|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This worked for me in a similar case:

<pre><code>mybutton.post(new Runnable(){
 @Override
 public void run() {
 mybutton.performClick();
 }
});
</code></pre>

This way the runnable will run only if the button is already loaded on the layout.

blocks|key|797530|text|@Override
public+void+onCreate(Bundle+savedInstanceState)+{
++++super.onCreate(savedInstanceState);
++++setContentView(R.layout.mylayout);

++++myButton+=+(Button)+findViewById(R.id.myButton);
++++myButton.setOnClickListener(this);
}


@Override
public+void+onStart()+{
++++myButton.performClick();
}

@Override
public+void+onClick(View+v)+{
++++//+DO+STUFF
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|797531|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>@Override
public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.mylayout);

 myButton = (Button) findViewById(R.id.myButton);
 myButton.setOnClickListener(this);
}


@Override
public void onStart() {
 myButton.performClick();
}

@Override
public void onClick(View v) {
 // DO STUFF
}
</code></pre>

blocks|key|794906|text|我闻到的似乎是你忘记将onClicklistner添加到你的视图中，我测试了你的方法，它工作得很好，我做了如下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|794907|全局定义按钮Button+btn;|style|CODE|794908|在onCreate()中|794909|btn=(Button)findViewById(R.id.button);
++++++++++++btn.setOnClickListener(new+OnClickListener()+{

++++++++++++++++@Override
++++++++++++++++public+void+onClick(View+v)+{

++++++++++++++++++++dialog();
++++++++++++++++}
++++++++++++});|code-block|syntax|javascript|794910|在onResume()中|794911|@Override
++++protected+void+onResume()+{

++++++++btn.performClick();
++++++++super.onResume();
++++}|794912|它成功地显示了一个对话框！|794913|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/reference/android/view/View.OnClickListener.html^0|B|E|0|0|6|B|0|1|A|0|0|1|A|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@$A|13|B|14|1|15]]|C|$]]|$1|D|3|E|5|6|7|16|8|@$A|17|B|18|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|19|8|@$A|1A|B|1B|F|G]]|9|@]|C|$]]|$1|J|3|K|5|L|7|1C|8|@]|9|@]|C|$M|N]]|$1|O|3|P|5|6|7|1D|8|@$A|1E|B|1F|F|G]]|9|@]|C|$]]|$1|Q|3|R|5|L|7|1G|8|@]|9|@]|C|$M|N]]|$1|S|3|T|5|6|7|1H|8|@]|9|@]|C|$]]|$1|U|3|-4|5|6|7|1I|8|@]|9|@]|C|$]]]|V|$W|$5|X|Y|Z|C|$10|11]]]]

What I smell, seem you forget to add <a href="http://developer.android.com/reference/android/view/View.OnClickListener.html" rel="nofollow">onClicklistner</a> to your view, I tested your way its works fine,
I did something like below:

define Button globally <code>Button btn;</code>

within <code>onCreate()</code>

<pre><code>btn=(Button)findViewById(R.id.button);
 btn.setOnClickListener(new OnClickListener() {

 @Override
 public void onClick(View v) {

 dialog();
 }
 });
</code></pre>

and within <code>onResume()</code>

<pre><code>@Override
 protected void onResume() {

 btn.performClick();
 super.onResume();
 }
</code></pre>

It successfully showing a dialog!

As soon as the layout is created I want a button to be clicked automatically and I use <code>button.performClick()</code> for that. 

The problem is that it doesn't work. It looks like I can't do that during the <code>onCreate, onStart, onResume</code> method. At what point is the button and its events created, so I can perform a click on it?

This 

<pre><code>@Override
protected void onResume() {
 super.onResume();
 mybutton.performClick();
}
</code></pre>

doesn't work.

Perform click on button in Android SDK

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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一旦布局被创建，我想要一个按钮被自动点击，为此我使用了button.performClick()。问题是它不起作用。看起来我不能在onCreate, onStart, onResume方法中做到这一点。按钮及其事件是在什么时候创建的，这样我就可以单击它了？这@Overrideprotected void onResum...

问在Android SDK中执行点击按钮
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问在Android SDK中执行点击按钮EN