How to create a temporary file in android

Question

I am trying to create a temporary file in application context and want to use it to fill a logcat of application but getting a problem as error given from application that file not exist. Here is my code:

  try {
  String command="logcat -d";
  final File outputFile = File.createTempFile("tempLogFile", ".log", context.getCacheDir());
  ProcessBuilder p = new ProcessBuilder(command + " > " + outputFile.getAbsolutePath());
  p.start().waitFor();

  AsyncHttpPut put = new AsyncHttpPut(url);
  MultipartFormDataBody body = new MultipartFormDataBody();
  body.addFilePart("file", outputFile);
  put.setBody(body);

  AsyncHttpClient.getDefaultInstance().executeString(put, new AsyncHttpClient.StringCallback() {
      @Override
      public void onCompleted(Exception ex, AsyncHttpResponse asyncHttpResponse, String res) {
          outputFile.delete();
          if (ex != null) {
              Log.e(TAG, " Error to update log file to server", ex);
              return;
          }

      }
  });

            } catch (IOException e) {
  Log.e(TAG, "Cannot execute log command:" + command, e);
            } catch (InterruptedException e) {
  Log.e(TAG, "Interrupted while calling a command " + command, e);
}

Here is a exception:

  08-23 12:16:43.558 27173-27976/com.mycome.myApp E/Util: Cannot execute log command:logcat -d
  java.io.IOException: Error running exec(). Command: [logcat -d > /data/data/com.mycome.myApp/cache/tempLogFile-295443322.log] Working Directory: null Environment: [ANDROID_ROOT=/system, EMULATED_STORAGE_SOURCE=/mnt/shell/emulated, LOOP_MOUNTPOINT=/mnt/obb, LD_PRELOAD=libsigchain.so:libNimsWrap.so, ANDROID_BOOTLOGO=1, EMULATED_STORAGE_TARGET=/storage/emulated, EXTERNAL_STORAGE=/storage/emulated/legacy, SYSTEMSERVERCLASSPATH=/system/framework/services.jar:/system/framework/ethernet-service.jar:/system/framework/wifi-service.jar, ANDROID_SOCKET_zygote=9, PATH=/sbin:/vendor/bin:/system/sbin:/system/bin:/system/xbin, ANDROID_DATA=/data, ANDROID_ASSETS=/system/app, ASEC_MOUNTPOINT=/mnt/asec, BOOTCLASSPATH=/system/framework/core-libart.jar:/system/framework/conscrypt.jar:/system/framework/okhttp.jar:/system/framework/core-junit.jar:/system/framework/bouncycastle.jar:/system/framework/ext.jar:/system/framework/framework.jar:/system/framework/telephony-common.jar:/system/framework/voip-common.jar:/system/framework/ims-common.jar:/system/framework/mms-common.jar:/system/framework/android.policy.jar:/system/framework/apache-xml.jar:/system/framework/dolby_ds.jar:/system/framework/dolby_ds2.jar:/system/framework/qcmediaplayer.jar:/system/framework/WfdCommon.jar:/system/framework/oem-services.jar:/system/framework/qcom.fmradio.jar:/system/framework/org.codeaurora.Performance.jar:/system/framework/vcard.jar:/system/framework/tcmiface.jar, ANDROID_PROPERTY_WORKSPACE=8,0, SECONDARY_STORAGE=/storage/sdcard1, ANDROID_STORAGE=/storage]
  at java.lang.ProcessManager.exec(ProcessManager.java:211)
  at java.lang.ProcessBuilder.start(ProcessBuilder.java:195)
  at com.mycome.myApp.util.Util$LongOperation.doInBackground(Util.java:232)
  at com.mycome.myApp.util.Util$LongOperation.doInBackground(Util.java:215)
  at android.os.AsyncTask$2.call(AsyncTask.java:292)
  at java.util.concurrent.FutureTask.run(FutureTask.java:237)
  at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
  at java.lang.Thread.run(Thread.java:818)
   Caused by: java.io.IOException: No such file or directory
  at java.lang.ProcessManager.exec(Native Method)
  at java.lang.ProcessManager.exec(ProcessManager.java:209)
  at java.lang.ProcessBuilder.start(ProcessBuilder.java:195) 
  at com.mycome.myApp.util.Util$LongOperation.doInBackground(Util.java:232) 
  at com.mycome.myApp.util.Util$LongOperation.doInBackground(Util.java:215) 
  at android.os.AsyncTask$2.call(AsyncTask.java:292) 
  at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
  at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) 
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
  at java.lang.Thread.run(Thread.java:818)

I already have permission in my application:

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

Can someone tell me why this is not working?

have you debugged your code ?. from the logcat it looks like your file is not being created. Look at these questions maybe they will be of any help https://stackoverflow.com/questions/3425906/creating-temporary-files-in-android https://stackoverflow.com/questions/12317934/what-is-the-best-way-to-create-temporary-files-on-android — Umair, Aug 23 '17 at 10:35
Well i debug this and also printing a a command in console that showing: logcat -d > /data/data/com.mycome.myApp/cache/tempLogFile-295443322.log This seems to be file is created at this path — user565, Aug 23 '17 at 10:36
@user565 then you are giving the wrong command for logcat to be saved in the file. Look at the answer below it's most probably the cause — Umair, Aug 23 '17 at 10:40

score 0 · Accepted Answer · answered Aug 23 '17 at 10:37

You're trying to execute the command "logcat -d tempfilename" with no parameters, instead of the command "logcat" with parameters "-d" and "tempfilename". The OS is looking for an executable called "logcat -d tempfilename" instead of "logcat".

See this question for a code snippet that works (question itself, not the answers).

How to create a temporary file in android

1 Answers1