android读取data/data/包名/file路径下的txt文件

android读取data/data/包名/file路径下的txt文件

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android 2012-04-28 13:21
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文件不能太大否则会报内存溢出

[java]
view plaincopyprint?

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;
}
}

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;
}
}