学习日记--测试startActivityForResult

一、startActivityForResult的运作模型



二、Java代码

<pre name="code" class="java">package com.hxzy.activityresult;

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 {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Button start = (Button) findViewById(R.id.startActivity);
start.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, ActivityB.class);
int arr[] = new int[2];
arr[0] = 1;
arr[1] = 1;
intent.putExtra(Constants.KEY_MAINACTIVITY, arr);
startActivityForResult(intent, Constants.request_code);
}
});
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (10 == Constants.request_code && 11 == Constants.result_code) {
int result = Integer.parseInt(data.getStringExtra(Constants.KEY_ACTIVITYB));
Log.d(this.getClass().getName() + " onActivityResult,运算结果为:", result + "");
}
}
}

2、ActivityB

package com.hxzy.activityresult;

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;

public class ActivityB extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_b);

Intent intent = getIntent();
int[] arr = intent.getIntArrayExtra(Constants.KEY_MAINACTIVITY);
final int sum = arr[0] + arr[1];

Button butto_Return = (Button) findViewById(R.id.returnActivity);
butto_Return.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
Intent intent = new Intent(ActivityB.this, MainActivity.class);
intent.putExtra(Constants.KEY_ACTIVITYB, sum + "");
ActivityB.this.setResult(Constants.result_code, intent);
ActivityB.this.finish();
}
});
}
}

3、Constants（存放静态变量）

package com.hxzy.activityresult;

public class Constants {
public static final String KEY_MAINACTIVITY="key";
public static final String KEY_ACTIVITYB="key";
public static final int request_code=10;
public static final int result_code=11;
}

三、layout布局文件

1、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"
tools:context="com.hxzy.activityresult.MainActivity" >

<Button
android:id="@+id/startActivity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="启动ActivityB" />

</RelativeLayout>

2、activity_b.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"
tools:context="com.hxzy.activityresult.MainActivity" >

<Button
android:id="@+id/returnActivity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="返回MainActivity" />

</RelativeLayout>

四、AndroidManifest.xml

在AndroidManifest.xml中添加ActivityB。

<activity
android:name=".ActivityB"
android:label="B" >
</activity>