Android跟你打招呼

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package com.example.sayhello;import android.R.string;import android.os.Bundle;import android.app.Activity;import android.util.Log;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;//（内部处理类处理）public class MainActivity extends Activity {public  final static String TAG = "MainActivity";private Button btnClick;private EditText tv_name;     @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //获取事件源        btnClick = (Button) findViewById(R.id.btnClick);        tv_name = (EditText) findViewById(R.id.tv_name);        btnClick.setOnClickListener(new btnClick());            }        //事件处理类    class btnClick implements OnClickListener{@Overridepublic void onClick(View v) {String name = tv_name.getText().toString();Log.d(TAG,"name="+name);Toast.makeText(MainActivity.this ,"你好"+name, Toast.LENGTH_LONG).show();}            }     }//匿名内部类/*public class MainActivity extends Activity {public  final static String TAG = "MainActivity";private Button btnClick;private EditText tv_name; @Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    //获取事件源    btnClick = (Button) findViewById(R.id.btnClick);    tv_name = (EditText) findViewById(R.id.tv_name);    btnClick.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubString name = tv_name.getText().toString();Log.d(TAG,"name="+name);Toast.makeText(MainActivity.this ,"你好"+name, Toast.LENGTH_LONG).show();}});    }}*/

<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:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:background="@drawable/bg"    tools:context=".MainActivity" >    <EditText        android:id="@+id/tv_name"android:hint="@string/sayHello"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:layout_centerHorizontal="true"        android:layout_marginTop="91dp"        android:ems="10" >        <requestFocus />    </EditText>    <Button        android:id="@+id/btnClick"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        android:layout_centerVertical="true"        android:text="@string/click"         /></RelativeLayout>

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="app_name">sayHello</string>    <string name="action_settings">Settings</string>    <string name="hello_world">Hello world!</string>    <string name="sayHello">请输入你的名字</string>    <string name="click">请点击我</string></resources>

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