Android:一个按钮点击事件,“意外停止”
问题描述:
这是我的代码,有什么事吗?Android:一个按钮点击事件,“意外停止”
运行结果“意外停止”。 它可以通过删除OnClickListener时,也就是说,该按钮点击绑定是错误的?
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>
的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>
答
测试下面的代码,
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>
MainActivity.java:
package com.example.*;
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());
}
});
}
}
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>
输出:
希望它能帮助你。 :-)
你能提供logcat输出吗? – sandrstar
除了提到的@sandrstar的LogCat之外,你能解释它何时崩溃吗?点击按钮?负载? – Eric