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;
- }
- }