android读取data/data/包名/file路径下的txt文件

文件不能太大否则会报内存溢出

package yu.bin;

import java.io.FileInputStream;
import org.apache.http.util.EncodingUtils;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class ReaddataPathActivity extends Activity {
    TextView textView;

    // 这个是读取data/data/包名/file路径下的文件
    // 这个目录可以用getFilesDir()方法得到
    /** 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 {
            // 获取文件
            FileInputStream fin = openFileInput("name.txt");
            // 获得长度
            int length = fin.available();
            // 创建字节数组
            byte[] buffer = new byte[length];
            // 读取内容
            fin.read(buffer);
            // 获得编码格式
            String type = codetype(buffer);
            // 按编码格式获得内容
            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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