异步任务AsyncTask

TestAsync.java

public class TestAsync extends Activity{
    ProgressBar progressBar;
    TextView textView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test_handler);

        progressBar=(ProgressBar)findViewById(R.id.progressBar);

        textView=(TextView)findViewById(R.id.handler_text);
        progressBar.setVisibility(View.INVISIBLE);

        Button sendButton=(Button)findViewById(R.id.handler_sendButton);
        sendButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                MyAsyncTask asyncTask=new MyAsyncTask();
                asyncTask.execute("1000");
            }
        });

    }
    private  class MyAsyncTask extends AsyncTask<String ,Integer,String>
    {
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            progressBar.setVisibility(View.VISIBLE);
        }

        @Override
        protected String doInBackground(String... strings) {
            String result="";
            int myProgress=0;
            int inputLength=100;
            for(int i=1;i<=inputLength;i++)
            {
                myProgress=i;
                result=result+"*";
                try{
                    Thread.sleep(100);
                }catch (InterruptedException e){}
                publishProgress(myProgress);
            }
            //返回一个值，将它返回给onPostExecute
            return result;
        }

        @Override
        protected void onProgressUpdate(Integer... values) {
            //和UI线程同步，可以在这里对UII界面更新
            //例如:更新进度条，Notification或者其他UI元素
            super.onProgressUpdate(values);
            progressBar.setProgress(values[0]);

        }
        @Override
        protected void onPostExecute(String s) {
            //和UI线程同步
            //更行UI Dialog 或者Notifiaction报告结果
            super.onPostExecute(s);
            Toast.makeText(TestAsync.this,"Success",Toast.LENGTH_SHORT).show();
            textView.setText(s);
            progressBar.setVisibility(View.GONE);
        }
    }
}

activity_test_handle.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
   >
    <ProgressBar
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_height="wrap_content"
        android:id="@+id/progressBar"
        android:layout_width="match_parent" />
    <TableRow
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
       <LinearLayout
           android:layout_width="match_parent"
           android:layout_height="wrap_content"
           android:orientation="horizontal">
           <EditText
               android:inputType="number"
               android:hint="a:"
               android:id="@+id/handler_parText1"
               android:layout_width="0dp"
               android:layout_weight="1"
               android:layout_height="wrap_content"
               />



           <EditText
               android:inputType="number"
               android:hint="b:"
               android:id="@+id/handler_parText2"
               android:layout_weight="1"
               android:layout_width="0dp"
               android:layout_height="wrap_content"
             />
       </LinearLayout>
    </TableRow>
    <TableRow
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <Button
            android:id="@+id/handler_sendButton"
            android:text="send"
            android:background="@drawable/send_button_selector"
            android:layout_width="match_parent"
            android:textColor="#ffffff"
            android:textSize="30sp"
            android:layout_height="wrap_content"/>
</TableRow>

    <TextView
        android:id="@+id/handler_text"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:textSize="25sp"
        />
</LinearLayout>