相关疑难解决方法(0)

我正在阅读AsyncTask,我尝试了下面的简单程序.但它似乎没有用.我怎样才能使它工作？

public class AsyncTaskActivity extends Activity {

    Button btn;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        btn = (Button) findViewById(R.id.button1);
        btn.setOnClickListener((OnClickListener) this);
    }

    public void onClick(View view){
        new LongOperation().execute("");
    }

    private class LongOperation extends AsyncTask<String, Void, String> {
        @Override
        protected String doInBackground(String... params) {
            for(int i=0;i<5;i++) {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            TextView txt = (TextView) findViewById(R.id.output); …

我想AsyncTask在我的应用程序中使用一个,但我无法找到一个代码片段,其中简单解释了工作原理.我只想要一些东西来帮助我快速恢复速度,而不必再次浏览文档或大量的问答.

我正在尝试使用Android解压缩文件夹AsyncTask.该类(称为Decompress)是一个内部类,Unzip其中Unzip本身是一个非Activity类.伪代码是:

public class Unzip {  
  private String index;  
  private String unzipDest;    //destination file for storing folder.
  private Activity activity;
  private boolean result;      //result of decompress.

  public void unzip(String loc) {

    Decompress workThread = new Decompress(loc, activity);
    workThread.execute();  
    if(unzip operation was successful) {
      display(index);
  }

  //Class Decompress:
class Decompress extends AsyncTask<Void, Integer, Boolean> {

        private ProgressDialog pd = null;
        private Context mContext;
                private String loc;
        private int nEntries;
        private int entriesUnzipped;

        public Decompress(String location, Context c) { …