Android控件之-Menu

Android中的菜单项，在Android中有个Menu按钮。主要是用来显示菜单的

package com.mnkjxy;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MyActivity extends Activity {
    /** Called when the activity is first created. */
	private TextView view = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        view = (TextView) findViewById(R.id.view);
        view.setText(R.string.view);
        
    }
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		menu.add(0, 1, 1, R.string.about);
		menu.add(0, 2, 2, R.string.exit);
		return super.onCreateOptionsMenu(menu);
	}
	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		int item_id = item.getItemId();
		switch(item_id) {
		case 1:
			Intent intent = new Intent();
			intent.setClass(MyActivity.this, OtherActivity.class);
			MyActivity.this.startActivity(intent);
			break;
		case 2:
			MyActivity.this.finish();
			break;
		}
		return super.onOptionsItemSelected(item);
	}
}

另一个Activity：

package com.mnkjxy;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class OtherActivity extends Activity{

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.other);
		TextView otherView = (TextView) findViewById(R.id.otherview);
		otherView.setText(R.string.view);
	}
	
}

main.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
	android:id="@+id/view"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
</LinearLayout>

other.xml和main.xml差不多，就是把id改一下。

 

记得在manifest中添加另一个Activity类。

	<activity android:name=".OtherActivity"
			android:label="@string/app_othername"
	  />