Android_Intent Demo(acticity1与activity2相互跳转)

Main.activity:

package com.example.intentdemo2;

import android.os.Bundle;

import android.app.Activity;

import android.content.Intent;

import android.util.Log;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends Activity {

private Button btn;

private static final int REQUEST_CODE=1;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

btn=(Button) findViewById(R.id.myButton1);

btn.setOnClickListener(new OnClickListener(){

public void onClick(View arg0){

Intent intent=new Intent();

intent.setClass(MainActivity.this, secondActivity.class);

intent.putExtra("str", "com from first activity");

startActivityForResult(intent,REQUEST_CODE);

}

});

}

@Override

protected void onActivityResult(int requestCode,int resultCode,Intent data){

super.onActivityResult(requestCode, resultCode, data);

if(requestCode==REQUEST_CODE){

if(resultCode==secondActivity.RESULT_CODE){

Bundle bundle=data.getExtras();

String str = bundle.getString("back");

Toast.makeText(MainActivity.this, str, Toast.LENGTH_LONG).show();

}

}

}

@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;

}

}

secondActivity:

package com.example.intentdemo2;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

import android.app.Activity;

import android.content.Intent;

public class secondActivity extends Activity {

private TextView tv;

private Button btn2;

public static final int RESULT_CODE=1;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.second);

Intent intent=getIntent();

Bundle bundle=intent.getExtras();

String str=bundle.getString("str");

tv=(TextView) findViewById(R.id.myTextView1);

tv.setText(str);

btn2=(Button) findViewById(R.id.myButton2);

btn2.setOnClickListener(new OnClickListener(){

public void onClick(View arg0){

Intent intent=new Intent();

intent.putExtra("back", "come from second activity");

setResult(RESULT_CODE,intent);

finish();

}

});

}

}

main.xml:

<LinearLayout 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:orientation="vertical" >

<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="第一个 activity" />

<Button

android:id="@+id/myButton1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="first"/>

</LinearLayout>

second.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" >

<TextView

android:id="@+id/myTextView1"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="第二个 activity" />

<Button

android:id="@+id/myButton2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="second"/>

</LinearLayout>

在 AndroidManifest.xml中添加 <activity android:name=".secondActivity" android:label="Second Activity"></activity>