Android：按钮点击事件，“意外停止”

Question

这是我的代码，怎么回事？

操作结果是“意外停止”。 它可以在删除OnClickListener时进行，也就是说，点击绑定的按钮是错误的？

gao.java

package cn.gao; 

import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.*; 

public class gao<hellotwo> extends Activity { 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState);  

        setContentView(R.layout.main); 
        Button btn=(Button)findViewById(R.id.go); 

        btn.setOnClickListener(new View.OnClickListener() 
        { 
                public void onClick(View v) 
                { 
                        EditText edt=(EditText)gao.this.findViewById(R.id.edt); 
                        TextView txt=(TextView)gao.this.findViewById(R.id.txt); 
                        txt.setText(getString(R.string.msg_dialog)+edt.getText()); 
                } 
        }); 
    } 
}

main.xml中

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    androidrientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    > 

<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"   
    /> 

<EditText id="@+id/edt" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="" 
/> 
<EditText id="@+id/txt" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="" 
/> 
<Button id="@+id/go" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:text="@string/go"> 
    <requestFocus /> 
</Button> 
</LinearLayout> 

strings.xml

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
    <string name="hello">hello android</string> 
    <string name="app_name">hellotwo</string> 
    <string name="tit_dialog">提示</string> 
    <string name="msg_dialog">你好，中国</string> 
    <string name="ok_dialog">确定</string> 
    <string name="go">浏览</string> 
</resources> 

Answer 1

下面的测试代码，

<强> activity_main.xml中：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    > 

<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"   
    /> 

<EditText
    android:id="@+id/edt"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:hint="@string/edit"
    android:text="" />

<EditText
    android:id="@+id/txt"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:hint="@string/edit"
    android:text="" />

<Button
    android:id="@+id/go"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/go" >

    <requestFocus /> 
</Button> 
</LinearLayout> 

<强> MainActivity.java ：

package com.example.stackoverflow;

import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btn=(Button)findViewById(R.id.go); 

        btn.setOnClickListener(new View.OnClickListener() 
        { 
                public void onClick(View v) 
                { 
                        EditText edt=(EditText)findViewById(R.id.edt); 
                        TextView txt=(TextView)findViewById(R.id.txt); 
                        txt.setText(getString(R.string.msg_dialog)+edt.getText()); 
                } 
        }); 
    }
}

<强> string.xml ：

<resources>    
    <string name="hello_world">Hello world!</string>
    <string name="menu_settings">Settings</string>
    <string name="title_activity_main">MainActivity</string>
    <string name="hello">hello android</string> 
    <string name="app_name">hellotwo</string> 
    <string name="tit_dialog">提示</string> 
    <string name="msg_dialog">你好，中国</string> 
    <string name="ok_dialog">确定</string> 
    <string name="go">浏览</string> 
    <string name="edit">Enter text</string> 
</resources>

<强>输出：

希望它会对你有所帮助。 ： - ）