Android 网络存储的例子

                                           Android 网络存储的例子

这一次，讲解Android 网络存储相关的知识。

1)新建项目，项目名称为：NetworkDemo
2)新建类，类名为：NetworkActivity1,继承Activity,代码如下所示：
package com.mesada.demo;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.KeyEvent;
import android.widget.EditText;

public class NetworkActivity1 extends Activity {
private EditText mEditText;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mEditText = (EditText) findViewById(R.id.EditText01);
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if (keyCode == KeyEvent.KEYCODE_BACK) {
Uri uri = Uri.parse("mailto:343827585@qq.com"); // 发送邮件的地址
Intent intent = new Intent(Intent.ACTION_SENDTO, uri);
intent.putExtra(android.content.Intent.EXTRA_SUBJECT, "网络存储");
intent.putExtra(android.content.Intent.EXTRA_TEXT,
String.valueOf(mEditText.getText()));
startActivity(intent);
this.finish();
return true;
}

return super.onKeyDown(keyCode, event);
}
}

3）以上类是保存内容到网络上的，要从网络上获得数据，我们新建另外一个类，也继承于Activity,代码如下所示：
package com.mesada.demo;

import java.io.BufferedInputStream;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

import org.apache.http.util.ByteArrayBuffer;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class NetworkActivity2 extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.getdata);

TextView tv=(TextView)findViewById(R.id.TextView01);

String msg="";
try {
URL url=new URL("http://linux.chinaitlab.com/command/723482.html");
URLConnection con=url.openConnection();
InputStream is=con.getInputStream();
BufferedInputStream bis=new BufferedInputStream(is);

ByteArrayBuffer baf=new ByteArrayBuffer(100);
int current=0;
while ((current=bis.read())!= -1) {
baf.append((byte)current);
}
msg=new String(baf.toByteArray(),"GBK");

} catch (Exception e) {
msg=e.getMessage();
}
tv.setText(msg);
}
}


3）
main.xml 文件如下所示：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:id="@+id/widget34"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<EditText
android:id="@+id/EditText01"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
</EditText>
</LinearLayout>

getdata.xml文件如下所示：
<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout
android:id="@+id/LinearLayout01"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<ScrollView
android:id="@+id/ScrollView01"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/TextView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></TextView>
</ScrollView>
</LinearLayout>

4）AndroidMainfest.xml 文件如下所示：
<?xml version="1.0" encoding="utf-8"?>
<manifest
xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mesada.demo"
android:versionCode="1"
android:versionName="1.0">
<application
android:icon="@drawable/icon"
android:label="@string/app_name">
<activity
android:name=".NetworkActivity1"
android:label="@string/app_name">
<intent-filter>
<action
android:name="android.intent.action.MAIN" />
<category
android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

<activity
android:name=".NetworkActivity2">
</activity>
</application>
<uses-permission
android:name="android.permission.INTERNET" />

</manifest>
5）完成。