start async task android

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Iker
21 Jul 2019
1import android.app.Activity;
2import android.os.AsyncTask;
3import android.os.Bundle;
4import android.provider.Settings.System;
5import android.view.View;
6import android.widget.Button;
7import android.widget.TextView;
8import android.view.View.OnClickListener;
9
10public class AsyncTaskActivity extends Activity implements OnClickListener {
11
12    Button btn;
13    AsyncTask<?, ?, ?> runningTask;
14
15    @Override
16    protected void onCreate(Bundle savedInstanceState) {
17        super.onCreate(savedInstanceState);
18        setContentView(R.layout.main);
19        btn = findViewById(R.id.button1);
20
21        // Because we implement OnClickListener, we only
22        // have to pass "this" (much easier)
23        btn.setOnClickListener(this);
24    }
25
26    @Override
27    public void onClick(View view) {
28        // Detect the view that was "clicked"
29        switch (view.getId()) {
30        case R.id.button1:
31            if (runningTask != null)
32                runningTask.cancel(true);
33            runningTask = new LongOperation();
34            runningTask.execute();
35            break;
36        }
37    }
38
39    @Override
40    protected void onDestroy() {
41        super.onDestroy();
42        // Cancel running task(s) to avoid memory leaks
43        if (runningTask != null)
44            runningTask.cancel(true);
45    }
46
47    private final class LongOperation extends AsyncTask<Void, Void, String> {
48
49        @Override
50        protected String doInBackground(Void... params) {
51            for (int i = 0; i < 5; i++) {
52                try {
53                    Thread.sleep(1000);
54                } catch (InterruptedException e) {
55                    // We were cancelled; stop sleeping!
56                }
57            }
58            return "Executed";
59        }
60
61        @Override
62        protected void onPostExecute(String result) {
63            TextView txt = (TextView) findViewById(R.id.output);
64            txt.setText("Executed"); // txt.setText(result);
65            // You might want to change "executed" for the returned string
66            // passed into onPostExecute(), but that is up to you
67        }
68    }
69}
70
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