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Recently, when working on the andoird project, we often encounter different machine models on the client side, resulting inProgramThere is a bug problem, and we cannot locate the exact location of this bug (because there is no log file ).
So I found the relevant information about writing program logs to the SD card, just like the Web log4j, to generate a log file to the
Although the permission to read and write the SD card is stated in the manifest file,
However, you still do not have permission when running the program. This is because the SD card itself does not have permission, so you need to modify the permissions of the SD
The Writes the debug information that you applied to the SD card.
Package com.sdmc.hotel.util;
Import Java.io.BufferedReader;
Import Java.io.File;
Import java.io.FileNotFoundException;
Import Java.io.FileOutputStream;
Import java.io.IOException;
Import Java.io.InputStreamReader;
Import Android.content.Context;
Import android.os.Environment;
Import Android.util.Log; /** * Log Statistics Save
When you save the picture after opening gallery, some will automatically refresh you, some do not, so that the picture saved to the SD card, not in time to see in gallery, encountered this situation is best to refresh themselves.
Full SD card scanning via intent.action_media_mounted:
The code is as follow
Recently, I have an i9000 Android mobile phone with 16 GB memory and no SD card. How can I download it?ProgramTo the memory and then install it?
I started one program a to download another program B. The Downloaded Program B can only be saved in the installation directory of program a ("/data//"), you are not authorized to save the settings elsewhere. You canno
1. Call Environment.getexternalstoragestate () to determine if an SD card is plugged into the phone and the application has permission to read and write the SD card.Environment.getexternalstoragestate (). Equals (environment.media_mounted)A return value of TRUE indicates that the application has permission to read and write to the
. Android_secure is the product of the official app2sd. After deletion, the software installed on the SD card cannot be used. There are a lot of. ASEC files, which are software installed on the SD card, but they are usually installed in the SD card.ProgramThe. android_secure
1, because the simulator must be installed under the system disk, so the default SD card file is also stored in the C disk, then the expansion of capacity will inevitably lead to the reduction of C disk space, which is usually intolerable to users, so you also need to transfer it to the hard disk of other more free partitions, The following functions can be used to facilitate the implementation of the Force
false;}/*** Delete Log File */public static void deleteLogFile () {File file = new File (filePath); if (file. exists () {file. delete ();}}}2. writing data to a file asynchronously does not affect user experience, and there cannot be any latency due to log writing. (In this experiment, if the data written to a file is small at a time, it will not be too slow even if the data is synchronized) to achieve this goal, we first consider multithreading. Another thread is responsible for writing logs t
I always thought that the automatic mounting of Android SD card is implemented in Vold, and its configuration file is easily found on the Internet which is system/etc/vold. in fstab, the configuration file is Mount, which is generally as follows:
Dev_mount sdcard/mnt/sdcard 3/devices/platform/sc65-sdhci.0/mmc_host/mmc0/mmc0: 0001/block/mmcblk0 nonremovable, en
(1) Description: The operation of the file on the SD card needs to add the following permissionsCreate and delete file permissions on an SD cardPermission to write data on an SD cardThe file on the SD card operation and my previou
Android obtains all pictures, video thumbnails, and album covers on the SD card.Query Images
First, query the inherent Android database. The image Uri isImages.Media.EXTERNAL_CONTENT_URI.The following is a specific instance query,FileInfoIs a custom data model.
Public ArrayList
QueryAllImage (final Context context) {if (context = null) {// judge the validi
Android-system information (memory, cpu, SD card, power, Version)The total memory size of memory (ram) android is stored in the system's/proc/meminfo file. You can read this file to obtain this information: copy the code public void getTotalMemory () {String str1 = "/proc/meminfo"; String str2 = ""; try {FileReader fr
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