因為計算大小相對比較耗時,所以儘量開始子執行緒計算,handler修改顯示的快取大小

 //開啟子執行緒,計算快取檔案的大小
new Thread(new Runnable() {
            @Override
public void run() {
                try {
                    //ImageLoader儲存快取圖片的路勁
File Cachepath = new File(Environment.

getExternalStorageDirectory().getPath() + "/ImageLoaderCache");
                    int 
 
FileSize = 0;
//            分別得到裡面檔案的大小
for (int i = 0; i < Cachepath.listFiles().length; i++) {
                        File file1 = Cachepath.listFiles()[i];
FileInputStream fi = new FileInputStream(file1);
FileSize += fi.available();//FileInputStream他的這個方法可以

得到檔案的大小}
                    //得到檔案的大小,設定到huancun這個TextView上面顯示
 
String size = Formatter.formatFileSize(SetActivity.this,

FileSize);
Message msg = Message.obtain();
msg.what = 1;
msg.obj = size;
handler.sendMessage(msg);
} catch (IOException e) {
                    e.printStackTrace();
}
            }
        }).start();

private Handler handler = new Handler() {
    @Override
 
public void handleMessage(Message msg) {
        super.handleMessage(msg);
        if (msg.what == 1) {
            String size = (String) msg.obj;
//修改當前快取大小
huancun.setText("當前快取:" + size);
}
    }
};

ImageLoader.getInstance().clearDiskCache();//清除快取
ImageLoader.getInstance().clearMemoryCache();//清除記憶體快取