Android利用StatFs查看SDCard物理信息

package cn.sohu.com;//1 查看SDCard相关信息的主要使用到的是StatFs类,没有其余难点//2 从SDCard中读取txt文件要注意//  第一:txt文件应该要按照UTF-8保存的.因为默认的是ANSI编码的！！！！！//  第二:不能使用openFileInput(filePath)方法获取输入流.因为此方法的参数要求不能含有路径分隔符.//       若这么做,报错：………………………………………………cannot contain  path separator////import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileInputStream;import android.app.Activity;import android.os.Bundle;import android.os.Environment;import android.os.StatFs;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;public class TestSDCardActivity extends Activity {   private Button SDbutton;   private Button Filebutton;   private TextView textView;   private EditText editText;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);               SDbutton=(Button) findViewById(R.id.Button1);        Filebutton=(Button) findViewById(R.id.Button2);        textView=(TextView) findViewById(R.id.textView);               SDbutton.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){//判断是否安装SDCardFile SDFile=Environment.getExternalStorageDirectory();StatFs statFs=new StatFs(SDFile.getPath());long blockSize=statFs.getBlockSize();//块容量float blocksCount=statFs.getBlockCount();//块数量int sizeM=(int) ((blockSize*blocksCount)/1024/1024);//总容量long ableBlocks=statFs.getAvailableBlocks();//可用容量int percent=(int) ((ableBlocks/blocksCount)*100);//可用百分比textView.setText("SDCard使用情况如下:\n"+"blockSize="+blockSize+",totalBlocks="+blocksCount+",sizeM="+sizeM+",ableBlocks="+ableBlocks+"\n"+"使用率:\n"+percent+"%");}else{Toast.makeText(getApplicationContext(), "未找到SDCard", 1).show();}}});        Filebutton.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {       editText =(EditText) findViewById(R.id.editeView);       String fileName=editText.getText().toString();       String filePath=Environment.getExternalStorageDirectory().toString()+"/"+fileName;                 try {String result=read(filePath);Log.i("Tag", "result="+result);textView.setText(result);} catch (Exception e) {e.printStackTrace();}}});    }    public String read(String filePath) throws Exception{//openFileInput方法的参数cannot contain  path separatorFile file=new File(filePath);FileInputStream inputStream=new FileInputStream(file);//FileInputStream inputStream=TestSDCardActivity.this.openFileInput(filePath);//注意这句代码！！！！！ByteArrayOutputStream outputStream=new ByteArrayOutputStream();byte [] b=new byte[1024];int len=0;while((len=inputStream.read(b))!=-1){outputStream.write(b, 0, len);Log.i("Tag", "len="+len);}outputStream.flush();String result=outputStream.toString("UTF-8");outputStream.close();inputStream.close();return result;}}