Activity跳转

本例中MainActivity为：FirstActivity.java

FirstActivity如下：

package com.wyl.intentmultiactivitytest;

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

public class FirstActivity extends Activity {
	//
	Button btn01;
	Button btn02;
	EditText et;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.firstctivity);// 绑定页面
		btn01 = (Button) findViewById(R.id.button1);
		btn02 = (Button) findViewById(R.id.button2);
		et = (EditText)findViewById(R.id.editText1);
		btn01.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				// 1.上下文对象，Context
				// 2.目标文件
				Intent intent = new Intent(FirstActivity.this,
						SecondActivity.class);
				System.out.println("======kaishi :====");
				startActivity(intent);// 实现跳转到第二个页面

			}
		});
		btn02.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				// 1.上下文对象，Context
				// 2.目标文件
				Intent intent = new Intent(FirstActivity.this,
						SecondActivity.class);
				System.out.println("======第一个页面的第二种跳转kaishi :====");
				startActivityForResult(intent, 1);;// 实现跳转到第二个页面

			}
		});
	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		// TODO Auto-generated method stub
		super.onActivityResult(requestCode, resultCode, data);
		if(requestCode==1&&resultCode==2){
			String plnr1 = data.getStringExtra("plnr");
			String plnr2 = data.getExtras().getString("plnr");
			System.out.println("==========:"+plnr1+",plnr2:"+plnr2);
			et.setText("data.getStringExtra('plnr1')"+plnr1+",plnr2 = data.getExtras().getString('plnr')的方式"+plnr2);
		}
	}
}

　　SecondActivity:

package com.wyl.intentmultiactivitytest;

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

public class SecondActivity extends Activity {
	Button btn01;
	Button btn02;
	EditText et;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.second_activity);// 绑定页面
		System.out.println("=====wo shi the second yemian =====");
		btn01 = (Button) findViewById(R.id.button21);
		btn02 = (Button) findViewById(R.id.button22);
		et = (EditText)findViewById(R.id.editText01);
		btn01.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				Intent intent = new Intent(SecondActivity.this, FirstActivity.class);
				System.out.println("==cong dier tiaodao diyiye==");
				startActivity(intent);
			}
		});
		btn02.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				Intent intent = new Intent();
				String content = et.getText().toString();//获取评论的内容
				intent.putExtra("plnr", content);

				//2是状态码，随便自己设置，用来判断是哪个页面的返回值，自己不弄混了就行
				setResult(2, intent);	//这是最关键的一步，
				Toast.makeText(SecondActivity.this, intent.getExtras().getString("plnr"),1000);
				finish();//关闭该页面，就会自动返回到了第一页了。
			}
		});

	}
}

　　相关的layout文件：

firstctivity.xml:

<?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" >

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="new Intent(context,目标activity.class),startActivity(intent)方式跳转" />

    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="第二种方式跳转" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="我只是个提示框框而已">

        <requestFocus />
    </EditText>

</LinearLayout>

　　second_activity.xml:

<?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" >

    <EditText
        android:id="@+id/editText01"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="录入要返回到第一页的内容" />
    <Button
        android:id="@+id/button21"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="我是第二个activity页面" />
	<Button
        android:id="@+id/button22"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="startActivityForResult方式返回，并且回传数据" />
</LinearLayout>

　　效果图如下：