Android之Intent对象

1.Intent对象的基本概念
  Intent是Android应用程序组件之一
  Intent对象在Android系统当中表示一种意图
  Intent当中最重要的内容是action与data

2.使用Intent在Activity之间传递数据的方法
  在activity之间可以通过Intent对象中传递数据
  使用putExtra()系列向Intent对象当中存储数据

  使用getXXXExtra()系列方法从Intent对象中取出数据

<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"
    tools:context=".MainActivity" >
    <Button 
        android:id="@+id/button1"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:text="启动第二个Activity"/>

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <TextView 
        android:id="@+id/text1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        />

</LinearLayout>

package com.android.xiong.intent_one;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {

	private Button button1;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		button1=(Button)findViewById(R.id.button1);
		OnClick on=new OnClick();
		button1.setOnClickListener(on);
	}
	
	class OnClick  implements OnClickListener{

		@Override
		public void onClick(View arg0) {
			// TODO Auto-generated method stub
			Intent intent =new Intent();
			intent.setClass(MainActivity.this, TwoActivity.class);
			String [] name={"zhangsan","lis","wangwu"};
			int []age={12,13,14};
			intent.putExtra("com.android.xiong.intent_one.Name", name);
			intent.putExtra("com.android.xiong.intent_one.Age", age);
			startActivity(intent);
			
			
		}
		
	}

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

}

package com.android.xiong.intent_one;

import java.util.HashMap;

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

public class TwoActivity  extends Activity{
	private TextView text1;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_two);
		text1=(TextView)findViewById(R.id.text1);
		Intent intent=getIntent();
		String []name=intent.getStringArrayExtra("com.android.xiong.intent_one.Name");
		int [] age=intent.getIntArrayExtra("com.android.xiong.intent_one.Age");
		String print="";
		for (int i = 0; i < age.length; i++) {
			print+="name: "+name[i].toString()+" age: "+age[i]+" \n";
		}
		text1.setText(print);
	}

}