【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