从开始按钮，点击新活动 [英] Starting new activity with button click

问题描述

我似乎无法开始新的活动从我的按钮，我已经在这里寻找答案，但似乎无法来解决问题。我希望有人有一个简单的解决方案。在此先感谢。

下面是错误：

  E / AndroidRuntime：致命异常：主要
java.lang.IllegalStateException：找不到的一个方法的OpenSearch（查看）
活动类dk.mathias.splitcab.MainActivity
为onclick处理程序的视图类android.widget.Button ID为'btnStartSearch
 

MainActivity.java

 保护无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.activity_main）;

}

公共无效的OpenSearch（）{
    意图openSearchIntent =新的意图（MainActivity.this，StartSearch.class）;
    startActivity（openSearchIntent）;
}
 

AndroidManifest.xml中

 ＆LT;活动
        机器人：名称=开始搜索
        机器人：标签=@字符串/ title_activity_start_search＆GT;
        ＆LT;意向滤光器＆gt;
            ＆lt;作用机器人：名称=dk.mathias.splitcab.STARTSEARCH/＆GT;

            ＆LT;类机器人：名称=android.intent.category.DEFAULT/＆GT;
        ＆所述; /意图滤光器＆gt;
    ＆LT; /活性GT;
 

activity_main.xml

 ＆LT;按钮
    机器人：layout_width =WRAP_CONTENT
    机器人：layout_height =WRAP_CONTENT
    机器人：文本=@字符串/开始搜索
    机器人：ID =@ + ID / btnStartSearch
    机器人：layout_alignParentBottom =真
    机器人：layout_alignParentLeft =真
    机器人：layout_alignParentStart =真
    机器人：layout_alignRight =@ + ID / tvWelcome
    机器人：layout_alignEnd =@ + ID / tvWelcome
    机器人：的onClick =OpenSearch的

    /＆GT;
 

StartSearch.java

 公共类开始搜索延伸活动{

@覆盖
保护无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.activity_start_search）;
    }
}
 

解决方案

现在的问题是在你的方法签名

 公共无效的OpenSearch（）{
 

它应该有一个，且只有一个参数，这是一个'查看

将其更改为

 公共无效的OpenSearch（视图v）{
 

v 明明可以是你希望它是什么，但你应该让一些有意义的事情，比如 v ，视图等等...

从文档

  

为了这个工作，方法必须是公开的，接受一个View作为其唯一的参数。

<一个href="http://stackoverflow.com/questions/18319711/android-eclipse-which-is-the-best-way-to-add-a-button/18319759#18319759">See这个答案添加按钮进行更详细的说明和的OnClick

I can't seem to start a new Activity from my Button, I have searched here for answers, but can't seem to resolve the problem. I hope someone has an easy solution. Thanks In advance.

Here is the error:

E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.IllegalStateException: Could not find a method openSearch(View) in the 
activity class dk.mathias.splitcab.MainActivity 
for onClick handler on view class android.widget.Button with id 'btnStartSearch'

MainActivity.java

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

}

public void openSearch(){
    Intent openSearchIntent = new Intent(MainActivity.this, StartSearch.class);
    startActivity(openSearchIntent);
}

AndroidManifest.xml

    <activity
        android:name=".StartSearch"
        android:label="@string/title_activity_start_search" >
        <intent-filter>
            <action android:name="dk.mathias.splitcab.STARTSEARCH" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>

activity_main.xml

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/StartSearch"
    android:id="@+id/btnStartSearch"
    android:layout_alignParentBottom="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_alignRight="@+id/tvWelcome"
    android:layout_alignEnd="@+id/tvWelcome"
    android:onClick="openSearch"

    />

StartSearch.java

public class StartSearch extends Activity {

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

解决方案

The problem is in your method signature

public void openSearch(){

it should have one, and only one param, which is a `View.

Change it to

public void openSearch(View v){

v obviously can be anything you want it to be but you should make it something meaningful like v, view, etc...

From the Docs

In order for this to work, the method must be public and accept a View as its only parameter.

See this answer for a more detailed description of adding Buttons and OnClick

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