Android 中Intent组件实现简单的Activity跳转

<!-- Manifest.xml -->


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.muye.intent"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="13" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.muye.intent.Send"
            android:label="@string/send_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        
        <activity 
             android:name="com.muye.intent.Receive"
            android:label="@string/receive_name">
            
        </activity>
    </application>

</manifest>

/**
 * 
 * Send.java
 */

package com.muye.intent;

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;
import android.widget.TextView;

public class Send extends Activity {

	private Button mybut;
	private TextView msg;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_send);
        this.mybut=(Button)super.findViewById(R.id.mybut);
        this.msg=(TextView)super.findViewById(R.id.msg);
        this.mybut.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				Intent intent=new Intent(Send.this,Receive.class);
				intent.putExtra("myinfo", "send发过去的内容");
				Send.this.setIntent(intent);
				Send.this.startActivityForResult(intent, 1);//如果要从其他的Activity中返回数据到本Activity中，要用这个方法
			}
		});
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.send, menu);
        return true;
    }
    @Override
//从第二个Activity返回数据到第一个Activity

//最重要的是int resultCod这个参数。从第二个Activity返回数据到本Activity的结果状态码 protected void onActivityResult(int requestCode, int resultCode, Intent data) {// TODO Auto-generated method stubswitch(resultCode){case RESULT_OK:Send.this.msg.setText("返回的内容是："+data.getStringExtra("retmsg"));break;case RESULT_CANCELED:Send.this.msg.setText("操作取消");break;default:break;}} }

<!-- activity_receive.xml -->

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_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=".Send" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/myview"/>
    
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="返回数据到send"
        android:id="@+id/retbut" 
        />

</LinearLayout>

/**
 * Receive.java    Activity
 */

package com.muye.intent;

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;
import android.widget.TextView;

public class Receive extends Activity {

    private TextView myview;
    private Button but;

	@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_receive);
        Receive.this.myview=(TextView)super.findViewById(R.id.myview);
        Receive.this.but=(Button)super.findViewById(R.id.retbut);
       
        this.but.setOnClickListener(new OnClickListener() {
		
		@Override
		public void onClick(View arg0) {
			// TODO Auto-generated method stub
			Receive.this.getIntent().putExtra("retmsg", "我是****");
			Receive.this.setResult(RESULT_OK, Receive.this.getIntent());
			Receive.this.finish();
		}//从这个Activity返回数据到第一个Activity，就要设置Intent返回的结果状态，并结束当前Activity.
	});
        Intent intent=super.getIntent();
        String info=intent.getStringExtra("myinfo");
		Receive.this.myview.setText(info);
    }


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

<!-- strings.xml -->

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">Intent</string>
    <string name="action_settings">Settings</string>
    <string name="mybutname">Send activity</string>
    <string name="send_name">send name</string>
     <string name="receive_name">receive name</string>


</resources>

<!-- activity_send.xml -->

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_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=".Send" >

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/mybutname" 
        android:id="@+id/mybut"/>

	<TextView 
	     android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/msg"/>
</LinearLayout>