android读取SDCard任意路径下的文件

文件不能太大否则会报内存溢出
import java.io.FileInputStream;import org.apache.http.util.EncodingUtils;import android.app.Activity;import android.os.Bundle;import android.widget.TextView;public class ReadAnythingPathActivity extends Activity {    TextView textView;    // 这个是读取SDCard任意路径下的文件    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        textView = (TextView) findViewById(R.id.tvtext);        String txt = "";        try {            // 文件路径            String filename = "/sdcard/ansi1.txt";                        // 或 String filename = "mnt/sdcard/ansi1.txt";            // 文件流读取文件            FileInputStream fin = new FileInputStream(filename);            // 获得字符长度            int length = fin.available();            // 创建字节数组            byte[] buffer = new byte[length];            // 把字节流读入数组中            fin.read(buffer);            // 关闭文件流            fin.close();            // 获得编码格式            String type = codetype(buffer);            // 使用编码格式获得内容            txt = EncodingUtils.getString(buffer, type);            textView.setText(txt);        }        catch(Exception e) {            // TODO: handle exception        }    }    private String codetype(byte[] head) {        String type = "";        byte[] codehead = new byte[3];        System.arraycopy(head, 0, codehead, 0, 3);        if(codehead[0] == -1 && codehead[1] == -2) {            type = "UTF-16";        }        else if(codehead[0] == -2 && codehead[1] == -1) {            type = "UNICODE";        }        else if(codehead[0] == -17 && codehead[1] == -69 && codehead[2] == -65) {            type = "UTF-8";        }        else {            type = "GB2312";        }        return type;    }}
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