android 文件操作 Andriod 资源文件之存取操作

<?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" >
<Button
android:id="@+id/read"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="读取资源文件(Raw)" />
<TextView
android:id="@+id/cont"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
package com.example.yanlei.wifi;
import android.content.res.Resources;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
import java.io.IOException;
import java.io.InputStream;
import java.util.Scanner;
public class MainActivity extends AppCompatActivity {
private Button btnRead=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnRead=(Button)super.findViewById(R.id.read);
//读取资源文件
btnRead.setOnClickListener(new OnClickListener(){
public void onClick(View v)
{
//获取资源对象
Resources res=MainActivity.this.getResources();
//通过openRawResource()读取资源为R.raw.friend的资源文件，结果返回到InputStream
InputStream input=res.openRawResource(R.raw.friend);
//读取资源文件内容
Scanner scan=new Scanner(input);
StringBuffer info=new StringBuffer();
while(scan.hasNext())
info.append(scan.next()).append("\n");
scan.close();

try {
input.close();
} catch (IOException e) {
e.printStackTrace();
}
Toast.makeText(getApplicationContext(), info.toString(),Toast.LENGTH_LONG).show();
}
});
}
}