2 Activity （修改成功）

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一实验结果图

二关键代码

package com.example.tryagain;import android.support.v7.app.ActionBarActivity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class TryagainActivity extends ActionBarActivity {private Button button_1;private EditText etName;@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_tryagain);button_1=(Button) findViewById(R.id.button1);button_1.setOnClickListener(new ClickHandler());etName=(EditText) findViewById(R.id.editText1);}class ClickHandler implements OnClickListener{@Overridepublic void onClick(View view){String name=etName.getText().toString();// TODO Auto-generated method stubToast.makeText(TryagainActivity.this, "hello"+name, Toast.LENGTH_LONG).show();}}}

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.tryagain"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="14" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".TryagainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@drawable/bg"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.tryagain.TryagainActivity" >        <requestFocus></requestFocus><Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/editText1"        android:layout_centerVertical="true"        android:layout_marginLeft="91dp"        android:background="@drawable/handok" /><EditText            android:id="@+id/editText1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignParentRight="true"            android:layout_alignParentTop="true"            android:layout_marginTop="82dp"            android:background="@android:drawable/edit_text"            android:drawableLeft="@drawable/name"            android:ems="10"            android:hint="@string/hello" /></RelativeLayout>

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