android小程序-----SayHello

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<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=".MainActivity" >    <TextView        android:id="@+id/tvName"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:layout_marginTop="99dp"        android:layout_toLeftOf="@+id/Button_click"        android:text="@string/nameNote" />    <Button        android:id="@+id/Button_click"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        android:layout_centerVertical="true"        android:src="@android:drawable/btn_star" />    <EditText        android:id="@+id/etName"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_above="@+id/Button_click"        android:layout_centerHorizontal="true"        android:layout_marginBottom="18dp"        android:ems="10"         android:drawableLeft="@drawable/smile"        >        <requestFocus />    </EditText></RelativeLayout>

package com.example.sayhello;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.ImageButton;import android.widget.Toast;public class MainActivity extends Activity {private Button Button_click;private EditText etName;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Button_click = (Button)findViewById(R.id.Button_click);        etName = (EditText) findViewById(R.id.etName);                Button_click.setOnClickListener(new OnClickListener() {        @Overridepublic void onClick(View v) {// TODO Auto-generated method stubString  name = etName.getText().toString();Toast.makeText(MainActivity.this, "你好"+name, Toast.LENGTH_SHORT).show();}});    }    }

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