Intent中指定程序要执行的动作（如：view,edit,dial）以及执行到该动作时所需要的资料，最后调用startActivity()。

1、作用

程序跳转、传递数据

Action/Data/Type/Catogory(对执行动作的附加信息进行描述)/Extras(其它附加信息)/Component(对目标组件的描述)

2、3种形式

startActivity()/startActivityForResult()

BroadcastReceiver

startService(Intent)和bindService(Intent,ServiceConnection,int)

3、相关方法

intent.putExtra(name,value);

intent.putExtras(bundle);

intent.getExtra();

getIntent();

4、常用action

Intent.ACTION_DIAL

Intent.ACTION_CALL

Intent.ACTION_VIEW

Intent.ACTION_EDIT

Intent.ACTION_DELETE

Intent.ACTION_PICK(选择数据)

//这是一个MainActivity，会分别发送startActivity和startActivityForResultpackage com.browan.server;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.Button;public class MainActivity extends Activity { protected static final int REQUST_CODE = 0; /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);//相关布局模板文件main.xml        find_and_modif_button();                            //startActivityForResult示例        Button.OnClickListener listener1 = new Button.OnClickListener()        {         public void onClick(View v)         {          Intent intent1 =  new Intent(MainActivity.this,Activity1.class);          intent1.putExtra("MainActivity", "这是来自MainActivity的数据。");          startActivityForResult(intent1,REQUST_CODE);         }        };            //startActivity示例        Button.OnClickListener listener2 = new Button.OnClickListener()        {         public void onClick(View v)         {          setTitle("这是在MainActivity");          Intent intent2 = new Intent(MainActivity.this,Activity2.class);          startActivity(intent2);         }        };                Button button1 = (Button) findViewById(R.id.button1);        button1.setOnClickListener(listener1);                Button button2 = (Button) findViewById(R.id.button2);        button2.setOnClickListener(listener2);            }   //对于返回结果的反映，startActivityForResult返回的结果指令的处理 protected void onActivityResult(int requst_code,int result_code,Intent data){     if(requst_code == REQUST_CODE)     {      if(result_code == RESULT_CANCELED)      {       setTitle("取消");      }      else if(result_code == RESULT_OK)      {       String temp = "";       Bundle extras = data.getExtras();       if(extras != null)       {        temp = extras.getString("store");       }       setTitle(temp);      }      else      {       setTitle("Others");      }     }    } }

下面再来看看Activity1.class部分：

package com.browan.server;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;public class Activity1 extends Activity{  public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity1);                  Button.OnClickListener listener3 = new Button.OnClickListener(){       public void onClick(View v){                Bundle bundle = new Bundle();           bundle.putString("store", "这是Activity1返回的数据。");           Intent mIntent = new Intent();           mIntent.putExtras(bundle);                 setResult(RESULT_OK,mIntent); //这个就是返回去的消息，setResult在收到消息之后才会被触发返回发送                                          //MainActivity里面的onActivityResult就会对intent里面的result_code（RESULT_OK）处理            finish();       }      };               Button button3 = (Button) findViewById(R.id.button3);         button3.setOnClickListener(listener3);                   Bundle extras = getIntent().getExtras();//这里读取到了MainActivity传来的消息内容         String data = null;   if(extras != null)         {          data  = extras.getString("MainActivity");         }         setTitle("现在是在Activity1里：" + data);  }}

Activity2.class：

package com.browan.server;import android.app.Activity;import android.os.Bundle;public class Activity2 extends Activity{  public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity2);                  setTitle("这里是在Activity2里。");  }}

xml各个的布局：

     
         
      
        
     5.5 activity1.xml
     
         
        
     5.6 activity2.xml
     
     

AndroidManifest. xml