Write android logcat data to a file

Here is an example of reading the logs.

You could change this to write to a file instead of to a TextView.

Need permission in AndroidManifest:

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

Code:

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);      }      TextView tv = (TextView) findViewById(R.id.textView1);      tv.setText(log.toString());    } catch (IOException e) {    }  }}

Logcat can write directly to a file:

public static void saveLogcatToFile(Context context) {        String fileName = "logcat_"+System.currentTimeMillis()+".txt";    File outputFile = new File(context.getExternalCacheDir(),fileName);    @SuppressWarnings("unused")    Process process = Runtime.getRuntime().exec("logcat -f "+outputFile.getAbsolutePath());}

more info on logcat: see http://developer.android.com/tools/debugging/debugging-log.html

Or you can try this variant

try {    final File path = new File(            Environment.getExternalStorageDirectory(), "DBO_logs5");    if (!path.exists()) {        path.mkdir();    }    Runtime.getRuntime().exec(            "logcat  -d -f " + path + File.separator                    + "dbo_logcat"                    + ".txt");} catch (IOException e) {    e.printStackTrace();}