Android日志文件的读写工具类

Z时代
2024-01-10
分类：IT

本文实例为大家分享了Android日志文件的读写工具类，供大家参考，具体内容如下

1. UI 效果

例如我们需要采集温度信息，可以不断写入一行一行的txt文本，读写文件操作即可

2. 调用示例

2.1 需要配置SD卡读写权限


<uses-sdk
  android:minSdkVersion="17"
  android:targetSdkVersion="17" />
 <!-- 往sdcard中写入数据的权限 -->
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 <!-- 在sdcard中创建/删除文件的权限 -->
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />

2.2 调用


public class MainActivity extends Activity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  for (int i = 0; i < 100; i++) {
   FileSaveUtil.writeFile("Temperature01.txt", String.format("Temperature : %.1f 摄氏度" , 30 + (float) i % 10));
  }
 }
}

3.工具类源码


package com.wu.sufadi;
import java.io.File;
import java.io.RandomAccessFile;
import android.os.Environment;
public class FileSaveUtil {
 public final static String FILE_PATH = Environment.getExternalStorageDirectory() + "/PhoneData/";
 public static void writeFile(String fileName, String content) {
  String strContent = content + "\n";
  try {
   File fileDir = new File(FILE_PATH);
   if (!fileDir.exists()) {
    fileDir.mkdirs();
    if (!fileDir.exists()) {
     return;
    }
   }
   File file = new File(FILE_PATH, fileName);
   RandomAccessFile raf = new RandomAccessFile(file, "rw");
   raf.seek(file.length());
   raf.write(strContent.getBytes());
   raf.close();
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 public static void delLogFile(String path) {
  File file = new File(path);
  if (file.exists()) {
   file.delete();
  }
 }
}