android 在TextView中显示EditText,通过Button按键,更改TextView的文字及变大

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android 在TextView中显示EditText,通过Button按键,更改TextView的文字及变大

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activity_main.xml

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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <EditText
        android:id="@+id/editText1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10" >
        <requestFocus />
    </EditText>
    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Button" />
    <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="TextView"
        android:textSize="20sp" />
</LinearLayout>

MainActivity.java

package com.example.ex05_work1;
import android.os.Bundle;
import android.R.integer;
import android.app.Activity;
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.TextView;
import android.support.v4.app.NavUtils;
public class MainActivity extends Activity {
 private Button button;
 private TextView textView;
 EditText editText;
 int size=20;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main); 
        button=(Button) findViewById(R.id.button1);
        textView=(TextView) findViewById(R.id.textView1);
        editText=(EditText) findViewById(R.id.editText1);
        button.setOnClickListener(new OnClickListener() {
    public void onClick(View arg0) {
    // TODO Auto-generated method stub
    textView.setText(editText.getText().toString());
    size +=1;
    textView.setTextSize(size);
   }
  });
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    } 
}