Android GPS启用禁用时间保存在带有多条线的SDCARD内的文本文件中

概述1.我正在使用SD卡内的文本日志文件保存 Android GPS启用和禁用时间. 我想打印多行文本,而不删除上一行数据. 下面的代码是完美打印多行,但当应用程序保持睡眠和重新启动时.当GPS开启或关闭时,与先前数据一起打印一行. 帮我解决一下. Required Output:(after Restart the app)<< GPs Enabled At :2016/06/08 17.15. 1.我正在使用SD卡内的文本日志文件保存 Android GPS启用和禁用时间.

我想打印多行文本,而不删除上一行数据.

下面的代码是完美打印多行,但当应用程序保持睡眠和重新启动时.当GPS开启或关闭时,与先前数据一起打印一行.

帮我解决一下.

required Output:(after Restart the app)<< GPs Enabled At :2016/06/08 17.15.00>><< GPs Disabled At :2016/06/08 17.45.00>><< GPs Enabled At :2016/06/08 17.49.00>><< GPs Disabled At :2016/06/08 17.52.00>>Getting Output:(after Restart the app)<< GPs Enabled At :2016/06/08 17.15.00>><< GPs Disabled At :2016/06/08 17.45.00>><< GPs Enabled At :2016/06/08 17.49.00>><< GPs Disabled At :2016/06/08 17.52.00>><< GPs Disabled At :2016/06/08 17.52.00>><< GPs Disabled At :2016/06/08 17.52.00>>

日志文件的方法：

public voID Logmethod(String noramalStr,String Dateval)    {    /* Log Folder Text files Starts here*/            try {                file newFolder = new file(Environment.getExternalStorageDirectory(),"GpsFolder");                if (!newFolder.exists()) {                    newFolder.mkdir();                }                try {                    file file = new file(newFolder,"GPsstatus" + ".txt");                    file.createNewfile();                 /*Writing the Log in specific files*/                    BuffereDWriter out;                    try {                        String separator1 = System.getProperty("line.separator");                        fileOutputStream fOut = new fileOutputStream(new file(newFolder + "/GPsstatus.txt"),true);                        OutputStreamWriter osw = new OutputStreamWriter(fOut);                        osw.append("<< " + noramalStr +" : "+Dateval + " >>");                        osw.append(separator1); // this will add new line ;                        osw.flush();                        osw.close();                        fOut.close();                        Log.i(noramalStr," : "+Dateval);                    } catch (fileNotFoundException e) {                        e.printstacktrace();                    } catch (IOException e) {                        e.printstacktrace();                    }                } catch (Exception ex) {                    System.out.println("ex: " + ex);                }            } catch (Exception e) {                System.out.println("e: " + e);            }        }

解决方法 如果有关删除日志文件的问题：
你总是做createNewfile尝试检查文件是否存在

public voID Logmethod(String noramalStr,String Dateval) {    try {        file newFolder = new file(Environment.getExternalStorageDirectory(),"GpsFolder");        boolean directoryExists = newFolder.exists();        Log.d(TAG," directoryExists = " + directoryExists);        if (!directoryExists) {            boolean dirCreate = newFolder.mkdir();            Log.d(TAG," dirCreate = " + dirCreate);        }        file file = new file(newFolder,"GPsstatus" + ".txt");        boolean fileExists = file.exists();        Log.d(TAG," fileExists = " + fileExists);        if (!fileExists) {            boolean fileCreateResult = file.createNewfile();            Log.d(TAG," fileCreateResult = " + fileCreateResult);        }        String separator1 = System.getProperty("line.separator");        fileOutputStream fOut = new fileOutputStream(new file(newFolder + "/GPsstatus.txt"),true);        OutputStreamWriter osw = new OutputStreamWriter(fOut);        osw.append("<< ");        osw.append(noramalStr);        osw.append(" : ");        osw.append(Dateval);        osw.append(" >>");        osw.append(separator1); // this will add new line ;        osw.flush();        osw.close();        fOut.close();        Log.i(TAG," : " + Dateval);    } catch (Exception e) {        e.printstacktrace();    }}

如果是关于位置提供者的永久监听启用/禁用
看看How do I receive the system broadcast when GPS status has changed?
并在清单文件中使用接收器

<receiver androID:name=".GPStStatusReceiver">        <intent-filter>            <action androID:name="androID.location.PROVIDERS_CHANGED" />        </intent-filter>    </receiver>

总结

以上是内存溢出为你收集整理的Android GPS启用/禁用时间保存在带有多条线的SDCARD内的文本文件中全部内容，希望文章能够帮你解决Android GPS启用/禁用时间保存在带有多条线的SDCARD内的文本文件中所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。