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

[java] view
plaincopy

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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