【小知识点总结】保存android日志logcat到文件中

LogCat存储在circular memory buffers中。

1、可以通过命令来导出Log： 

引用

adb logcat -d > logcat.txt

2、在程序中获取Log的方法：

添加日志读取权限：

<uses-permission android:name="android.permission.READ_LOGS" />

代码如下：
public class LogTest extends Activity {  
  @Override  
  public void onCreate(Bundle savedInstanceState) {  
    super.onCreate(savedInstanceState);  
    setContentView(R.layout.main);  
    try {  
      Process process = Runtime.getRuntime().exec("logcat -d");  
      BufferedReader bufferedReader = new BufferedReader(  
      new InputStreamReader(process.getInputStream()));  
  
      StringBuilder log=new StringBuilder();  
      String line;  
      while ((line = bufferedReader.readLine()) != null) {  
        log.append(line);  
      } 
//可以写到TextView中 
      TextView tv = (TextView)findViewById(R.id.textView1);  
      tv.setText(log.toString()); 
//也可以写到app指定的文件中去
String logPath = Environment.getExternalStorageDirectory().getPath() + "/logcat.log";
LogUtils.f(logPath, log.toString(), false); 
    } catch (IOException e) {  
    }  
  }  
} 

LogUtils代码：
public final class LogUtils {
public static void f(String logPath, String logData, boolean override) {
BufferedWriter writer = null;
try {
writer = new BufferedWriter(new FileWriter(logPath, !override));
if (!override) {
writer.append(logData);
} else {
writer.write(logData);
}
writer.newLine();
} catch (FileNotFoundException e) {
e(new LogUtils(), e.toString());
} catch (IOException e) {
e(new LogUtils(), e.toString());
} finally {
try {
if (writer != null) {
writer.flush();
writer.close();
}
} catch (Exception e2) {
e(new LogUtils(), e2.toString());
}
}
}
}


释放资源代码：
if (bufferedReader != null)  
        {  
            try  
            {  
            bufferedReader.close();  
            } catch (IOException e)  
            {  
                e.printStackTrace();  
            }  
        }  
if (process != null)  
        {  
            process.destroy();  

        } 

其他相关链接：Android的log保存到文件上查看