encrypt external sd card

The previous section describes how to store files to an internal device. Sometimes, you need to store files to an external storage device, such as an SD card. Because SD cards have greater storage space, they can also be easily shared with other users. Use the example in the previous section to save the text entered b

The previous section describes how to store files to internal devices. Sometimes, you need to store files to external storage devices, such as SD cards. Because the SD card has a larger storage space and can easily share these files with other users. Use the example in the previous section to save the text you entered

the output streamSdpath + = "/" +FILENAME; Try{FileOutputStream fos=NewFileOutputStream (Sdpath,true); //traditional Way byte array modeFos.write (Content.getbytes ("Utf-8")); Fos.close (); Toast.maketext (activitydata. This, "Saved successfully", Toast.length_short). Show (); } Catch(Exception e) {e.printstacktrace (); Toast.maketext (activitydata. This, "Save Failed", Toast.length_short). Show (); } } Else{toast.maketext (activitydata). This, "

获取手机里所有存储设备盘符,首先需要得到挂载在手机上的有哪些盘符,这里需要用到一个被系统隐藏的方法，即StorageManager下的getVolumePaths()方法。具体通过反射得到。方法返回值为字符串数组，getVolumeList返回所有相关信息 StorageVolume: mStorageId=131073 mPath=/storage/external //盘符（路径） mDescriptionId=17040902 mPrimary=false mRemovable=true //是否可卸载，内置SD卡无法卸载，外置SD卡可以卸载，据此可判断是否存在外置SD卡， //这样在某些APP中可以将某些数据优先存储到外置

Solution: After loading the external SD card, through the main menu into the "settings-storage" To set the default storage SD card, when the installation of software, installation interface Select the application installation location for the "

Recently, the status of external storage devices needs to be monitored in the project, so this note has been collated for later viewing.Broadcasts emitted when the state of an external storage device changesCompare broadcasts in different states1. When inserting an external SD card