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;@Overrideprotected 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{@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubIntent 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);}}@Overridepublic 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;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.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);}}