移动应用开发 实验报告5 Intent回传数据

二、实验内容

使用按钮事件与Intent实现页面数据的双向传输

四、实验代码及结果

package com.example.luz1;

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 MainActivity extends Activity {

    private Button mybut = null;

    private TextView msg = null;

    @Override

    protected void onCreate(Bundle   savedInstanceState) {

       super.onCreate(savedInstanceState);

       setContentView(R.layout.activity_main);

       this.mybut = (Button) super.findViewById(R.id.mybut);

       this.mybut.setOnClickListener((OnClickListener) new   OnClickListenerImpl());

       this.msg = (TextView) super.findViewById(R.id.msg);

    }

    private class OnClickListenerImpl implements   OnClickListener{

       @Override

       public void onClick(View v){

           Intent it = new Intent(MainActivity.this, receive.class);

           it.putExtra("myinfo","你传你马呢？");

           MainActivity.this.startActivityForResult(it,1);

       }

    }

    @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;

    }

    @Override

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

       switch(resultCode){

       case RESULT_OK:

           MainActivity.this.msg.setText("返回的内容是："+data.getStringExtra("retmsg"));

           break;

       case RESULT_CANCELED:

           MainActivity.this.msg.setText("操作取消");

       default:

           break;

       }

    }

}

package com.example.luz1;

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.TextView;

public class receive extends Activity {

    private TextView show = null;

    private Button retbut = null;

    @Override

    protected void onCreate(Bundle   savedInstanceState) {

       super.onCreate(savedInstanceState);

       super.setContentView(R.layout.receive_main);

       this.show = (TextView) super.findViewById(R.id.show);

       this.retbut = (Button) super.findViewById(R.id.rebut);

       Intent it = super.getIntent();

       String info = it.getStringExtra("myinfo");

       this.show.setText(info);

       this.retbut.setOnClickListener(new   OnClickListenerImpl());

    }

    private class OnClickListenerImpl implements   OnClickListener{

       @Override

       public void onClick(View v){

           receive.this.getIntent().putExtra("retmsg","你要的马吗？");

           receive.this.setResult(RESULT_OK,receive.this.getIntent());

           receive.this.finish();

       }

    }

}

<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=".Send"   >

    <Button

        android:id="@+id/mybut"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="传个马" />

    <TextView

        android:id="@+id/msg"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/mybut"

        android:layout_alignRight="@+id/mybut"

        android:layout_below="@+id/mybut"

        android:layout_marginTop="30dp"/>

</RelativeLayout>

<?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/show"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"/>

    <Button

        android:id="@+id/rebut"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="回传个马"/>

</LinearLayout>

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

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.luz1"

    android:versionCode="1"

    android:versionName="1.0"   >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="10"   />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme"   >

        <activity

            android:name="com.example.luz1.MainActivity"

            android:label="Luz1"   >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER"   />

            </intent-filter>

        </activity>

        <activity

            android:name="com.example.luz1.receive"

            android:label="Luz2"   >

        </activity>

    </application>

</manifest>

结果：

五、试验分析（思考）

首先，要打开Activity，先创建意图对象。

第一个参数是intent。 这个方法有两个重载的方法，一个是两个参数，一个是三个参数。 那我们就把三个参数说完吧： 第二个参数是requestCode，第三个参数

 * @param options Additional options for how   the Activity should be started.

这个参数的意思是设置Activity是如何启动的，在ActivityOptions这个类里面，就是封装Activity的启动参数的。这个Bundle可以理解为一个可以封装多种集合即可。