android实现清理缓存功能

/**
* 获取app的缓存大小
* 1. 录制的视频/storage/emulated/0/xueliangapp/video/1573972925136.mp4
* 2. 录制的音频/storage/emulated/0/xueliangapp/radio/1573972925136.amr
* 3. 下载的更新包/storage/emulated/0/Android/data/com.sdxzt.xueliangapp_v3/files/Download/xueliang_update.apk
* 4. 缓存/storage/emulated/0/Android/data/com.sdxzt.xueliangapp_v3/cache
*/
File videoDir,radioDir,filesDir,cacheDir;
private String getAppCache(){
long fileSize = 0;
String cacheSize = "0KB";
videoDir = new File(Environment.getExternalStorageDirectory()+"/xueliangapp/video");
Log.d(TAG, "getAppCache: videoDir大小: "+getDirSize(videoDir));
radioDir = new File(Environment.getExternalStorageDirectory()+"/xueliangapp/radio");
Log.d(TAG, "getAppCache: radioDir大小: "+getDirSize(radioDir));
filesDir = getActivity().getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS);
Log.d(TAG, "getAppCache: filesDir大小: "+getDirSize(filesDir));
///storage/emulated/0/Android/data/com.sdxzt.xueliangapp_v3/files,这里面有download文件夹,里面是下载的更新包
cacheDir = getActivity().getExternalCacheDir();
Log.d(TAG, "getAppCache: cacheDir大小: "+getDirSize(cacheDir));
///storage/emulated/0/Android/data/com.sdxzt.xueliangapp_v3/cache
fileSize += getDirSize(getActivity().getFilesDir());
fileSize += getDirSize(getActivity().getCacheDir());//这行是默认的缓存地址,看图片什么的会在这里积累缓存
fileSize += getDirSize(videoDir);
fileSize += getDirSize(radioDir);
fileSize += getDirSize(filesDir);
fileSize += getDirSize(cacheDir);
String fileSizeStr = formatFileSize(fileSize);
Log.d(TAG, "getAppCache: 总缓存大小: "+fileSizeStr);
return fileSizeStr;
}
/**
* 获取文件大小(字节为单位)
* @param dir
* @return
*/
private long getDirSize(File dir) {
if (dir == null) {
return 0;
}
if (!dir.isDirectory()) {
return 0;
}
long dirSize = 0;
File[] files = dir.listFiles();
for (File file : files) {
if (file.isFile()) {
dirSize += file.length();//文件的长度就是文件的大小
} else if (file.isDirectory()) {
dirSize += file.length();
dirSize += getDirSize(file); // 递归调用继续统计
}
}
return dirSize;
}
/**
* 格式化文件长度
* @param fileSize
* @return
*/
private String formatFileSize(long fileSize){
DecimalFormat df = new DecimalFormat("#0.00");//表示小数点前至少一位,0也会显示,后保留两位
String fileSizeString = "";
if (fileSize < 1024) {
fileSizeString = df.format((double) fileSize) + "B";
} else if (fileSize < 1048576) {
fileSizeString = df.format((double) fileSize / 1024) + "KB";
} else if (fileSize < 1073741824) {
fileSizeString = df.format((double) fileSize / 1048576) + "MB";
} else {
fileSizeString = df.format((double) fileSize / 1073741824) + "G";
}
return fileSizeString;
}
private void setAppCache() {
String fileSize = getAppCache();
fileSizeTv.setText(fileSize);
Log.d(TAG, "setAppCache: 重新显示缓存大小");
Log.d(TAG, "setAppCache: 当前缓存"+fileSize);
}
public void clearAppCache(final Activity activity){
final Handler handler = new Handler(){
@Override
public void handleMessage(@NonNull Message msg) {
super.handleMessage(msg);
Log.d(TAG, "handlerMessage: ");
if (msg.what == 1) {
setAppCache();
Log.d(TAG, "handlerMessage: 缓存清除完毕");
ToastUtil.showMsg(getActivity(),"缓存清除完毕");
}else {
ToastUtil.showMsg(getActivity(),"缓存清除失败");
Log.d(TAG, "handlerMessage: 缓存清除失败");
}
}
};
new Thread(new Runnable() {
@Override
public void run() {
Log.d(TAG, "run: ");
Message msg = new Message();
try {
clearCacheFolder(videoDir,System.currentTimeMillis());
clearCacheFolder(radioDir,System.currentTimeMillis());
clearCacheFolder(filesDir,System.currentTimeMillis());
clearCacheFolder(cacheDir,System.currentTimeMillis());
msg.what = 1;
}catch (Exception e){
e.printStackTrace();
msg.what = -1;
}
handler.sendMessage(msg);
}
}).start();
}
/**
* 清除缓存目录
* @param dir 目录
* @param curTime 当前系统时间
*/
private int clearCacheFolder(File dir,long curTime){
int deletedFiles = 0;
if (dir!= null && dir.isDirectory()) {
try {
for (File child:dir.listFiles()) {
if (child.isDirectory()) {
deletedFiles += clearCacheFolder(child, curTime);
}
if (child.lastModified() < curTime) {
if (child.delete()) {
deletedFiles++;
}
}
}
} catch(Exception e) {
e.printStackTrace();
}
}
Log.d(TAG, "clearCacheFolder: 清除目录: "+dir.getAbsolutePath());
return deletedFiles;
}