startActivityForResult数据传递

主界面代码

package com.xiake.seng;

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

public class MainActivity extends Activity implements OnClickListener {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn = (Button) findViewById(R.id.btn);
btn.setOnClickListener(this);

}

@Override
public void onClick(View v) {

//通过startActivityForResult传送数据，同时MainActivity不失联
Intent intent = new Intent(this, ActivityA.class);
intent.putExtra("main1", new int[] { 2, 3 });
startActivityForResult(intent, 2);

}

//获取其他通过startActivityForResult方法启动的界面的值
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
int msg=data.getIntExtra("activitya1", -1);

Log.d("MainActivity接收到的数据", msg+"");
}

}

另一个界面代码

package com.xiake.seng;

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

public class ActivityA extends Activity implements OnClickListener {
int data[] = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_a);
Button btn = (Button) findViewById(R.id.btn);
btn.setOnClickListener(this);

// 接收数据
Intent intent = this.getIntent();
data = intent.getIntArrayExtra("main1");
Log.d("ActivityA接收到的数据", data[0] + ":" + data[1]);

}

@Override
public void onClick(View v) {
//跳转到指定页面
Intent intent = new Intent(this, MainActivity.class);
int sum = data[0] + data[1];
intent.putExtra("activitya1", sum);
// 返回值当前内的方法
this.setResult(100, intent);
// 关闭界面进入destroy
this.finish();
}

}

两个布局代码

activity_main.xml

<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="com.xiake.seng.MainActivity" >

<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="发送到ActivityA" />

</RelativeLayout>

activitya.xml

<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="com.xiake.seng.MainActivity" >

<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="回到MainActivity" />

</RelativeLayout>

在AndroidManifest中注册

<activity

android:name=".ActivityA">

</activity>