android应用开发详解（二）-----------Layout和Menu的使用

1、工程目录



2、TestLayoutMenuActivity.java

package com.example.testlayout;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class TestLayoutMenuActivity extends Activity {
private Button myButton;
private TextView myTextView;
private EditText myEditText;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.test_xml);
myButton = (Button) findViewById(R.id.layoutButton01);
myEditText = (EditText) findViewById(R.id.editView01);
myTextView = (TextView) findViewById(R.id.layoutTextView01);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.filemenu, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
switch (item.getItemId()) {
case R.id.about:
System.out.println("About");
new AlertDialog.Builder(this).setMessage("关于").setCancelable(false)
.setPositiveButton("确定", new OnClickListener() {

@Override
public void onClick(DialogInterface arg0, int arg1) {
// TODO Auto-generated method stub
System.out.println("您点击了关于中的确定选项");
}
}).create().show();

break;
case R.id.exit:
System.out.println("Exit");
new AlertDialog.Builder(this).setMessage("退出").setCancelable(false)
.setPositiveButton("确定", new OnClickListener() {

@Override
public void onClick(DialogInterface arg0, int arg1) {
// TODO Auto-generated method stub
System.out.println("您点击了确定");
finish();
}
}).setNegativeButton("取消", new OnClickListener() {

@Override
public void onClick(DialogInterface arg0, int arg1) {
// TODO Auto-generated method stub
System.out.println("您点击了取消");
return;
}
}).create().show();
break;
}
return true;
}

}

3、布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<TableLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:stretchColumns="1" >

<TableRow>

<TextView
android:id="@+id/layoutTextView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="测试Layout:"
android:textColor="@android:color/holo_blue_bright" />

<EditText
android:id="@+id/editView01"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="" />
</TableRow>

<TableRow android:gravity="right" >

<Button
android:id="@+id/layoutButton01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Test" />
</TableRow>
</TableLayout>

</LinearLayout>

4、Menu文件

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >

<item android:title="File">
<menu>
<group
android:id="@+id/noncheckable_group"
android:checkableBehavior="none" >
<item
android:id="@+id/newfile"
android:alphabeticShortcut="n"
android:title="New">
</item>
<item
android:id="@+id/openfile"
android:alphabeticShortcut="o"
android:title="open">
</item>
<item
android:id="@+id/savefile"
android:alphabeticShortcut="s"
android:title="save">
</item>
</group>
</menu>
</item>
<item android:title="Edit">
<menu>
<group
android:id="@+id/edit_group"
android:checkableBehavior="single" >
<item
android:id="@+id/cut"
android:title="Cut">
</item>
<item
android:id="@+id/copy"
android:title="Copy">
</item>
<item
android:id="@+id/past"
android:title="Past">
</item>
</group>
</menu>
</item>
<item android:title="Help">
<menu>
<group android:id="@+id/help_group" >
<item
android:id="@+id/about"
android:title="About">
</item>
<item
android:id="@+id/exit"
android:title="Exit">
</item>
</group>
</menu>
</item>

</menu>

注意的问题：menu文件放在menu文件夹下。menu可以嵌套使用。布局文件中嵌套使用了Tabelayout布局。值得学习。