Android file copy

Android file copy

Recently, a small test program was developed in the project, and files need to be copied. The Code is as follows:

    // fixed for raw data test.    private static final String RAW_DATA_TEST = "***123***";    private static final String EXTERNAL_STORAGE = "/mnt/sdcard2";    private static final String INTERNAL_STORAGE = "/mnt/sdcard";        private static final String RAW_DATA_CFG_FILE_NAME = "config.xml";

    // fixed for raw data test.    static public boolean handleRawDataTest(Context context, String input) {        if (RAW_DATA_TEST.equals(input)) {            Log.d(TAG, "handleRawDataTest");            if (!copyRawDataCfgFile()) {                Log.d(TAG, "handleRawDataTest, get Raw Data Cfg file failed!");                Toast.makeText(context,                     context.getString(R.string.raw_data_cfg_file_not_exist),                     Toast.LENGTH_SHORT).show();                return false;            }                        Intent intent = new Intent();            intent.setComponent(new ComponentName("com.goodix.rawdata",                                         "com.goodix.rawdata.RawDataTest"));            context.startActivity(intent);            return true;        }                return false;    }    public static boolean copyRawDataCfgFile() {        String state = Environment.getExternalStorageState();        if (!Environment.MEDIA_MOUNTED.equals(state)) {            return false;        }        String srcFileName = EXTERNAL_STORAGE + File.separator + RAW_DATA_CFG_FILE_NAME;        String destFileName = INTERNAL_STORAGE + File.separator + RAW_DATA_CFG_FILE_NAME;        Log.d(TAG, "copyRawDataCfgFile, srcFileName = " + srcFileName + ", destFileName = " + destFileName);        try {            if (copyFile(srcFileName, destFileName, true)) {                Log.d(TAG, "copyRawDataCfgFile, successfull!");                return true;            }        } catch (Exception e) {            e.printStackTrace();        }        Log.d(TAG, "copyRawDataCfgFile, fail!");        return false;    }    public static boolean copyFile(String srcFileName, String destFileName, boolean reWrite)         throws IOException {        Log.d(TAG, "copyFile, begin");        File srcFile = new File(srcFileName);        File destFile = new File(destFileName);                if(!srcFile.exists()) {            Log.d(TAG, "copyFile, source file not exist.");            return false;        }        if(!srcFile.isFile()) {            Log.d(TAG, "copyFile, source file not a file.");            return false;        }        if(!srcFile.canRead()) {            Log.d(TAG, "copyFile, source file can't read.");            return false;        }        if(destFile.exists() && reWrite){            Log.d(TAG, "copyFile, before copy File, delete first.");            destFile.delete();        }        try {            InputStream inStream = new FileInputStream(srcFile);            FileOutputStream outStream = new FileOutputStream(destFile);            byte[] buf = new byte[1024];            int byteRead = 0;            while ((byteRead = inStream.read(buf)) != -1) {                outStream.write(buf, 0, byteRead);            }            outStream.flush();            outStream.close();            inStream.close();        } catch (IOException e) {            throw e;        } catch (Exception e) {            e.printStackTrace();        }        Log.d(TAG, "copyFile, success");        return true;    }      

The code is relatively simple, but a strange exception is reported in the middle, and it has been entangled for a long time. Fortunately, I found the root cause of the problem before leaving work. Write down this event, so that you can skip it.

The exception is as follows:

01-01 00:14:31.070: E/StrictMode(3297): A resource was acquired at attached stack trace but never released. See java.io.Closeable for information on avoiding resource leaks.01-01 00:14:31.070: E/StrictMode(3297): java.lang.Throwable: Explicit termination method 'close' not called01-01 00:14:31.070: E/StrictMode(3297): at dalvik.system.CloseGuard.open(CloseGuard.java:184)01-01 00:14:31.070: E/StrictMode(3297): at java.io.FileInputStream.
 
  (FileInputStream.java:80)01-01 00:14:31.070: E/StrictMode(3297): at com.android.dialer.SpecialCharSequenceMgr.copyFile(SpecialCharSequenceMgrProxy.java:768)01-01 00:14:31.070: E/StrictMode(3297): at com.android.dialer.SpecialCharSequenceMgr.copyRawDataCfgFile(SpecialCharSequenceMgrProxy.java:702)01-01 00:14:31.070: E/StrictMode(3297): at com.android.dialer.SpecialCharSequenceMgr.handleRawDataTest(SpecialCharSequenceMgrProxy.java:674)01-01 00:14:31.070: E/StrictMode(3297): at com.android.dialer.SpecialCharSequenceMgr.handleCharsForTest(SpecialCharSequenceMgrProxy.java:618)01-01 00:14:31.070: E/StrictMode(3297): at com.android.dialer.SpecialCharSequenceMgr.handleChars(SpecialCharSequenceMgrProxy.java:88)01-01 00:14:31.070: E/StrictMode(3297): at com.android.dialer.dialpad.DialpadFragment.afterTextChanged(DialpadFragment.java:451)01-01 00:14:31.070: E/StrictMode(3297): at android.widget.TextView.sendAfterTextChanged(TextView.java:7626)01-01 00:14:31.070: E/StrictMode(3297): at android.widget.TextView$ChangeWatcher.afterTextChanged(TextView.java:9424)
 

I also searched "java. io. closeable for information on avoiding resource leaks "and" java. lang. throwable: Explicit termination method 'close' not called ". I have not found any similar situations. Generally, it is caused by the memory leakage caused by cursor. Finally, I checked the code repeatedly and found that the root cause of the problem was not specified correctly in the target directory of the file I copied. When a problem occurs, I specify INTERNAL_STORAGE as "/mnt/sdcard0" and throw an exception when calling new FileOutputStream (destFile) because the directory does not exist. The root directory of the mobile phone's internal storage is "/mnt/sdcard", which actually points to "/storage/sdcard0 ".