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How to stop AsyncTask thread in android?
This example demonstrates how do I stop AsynchTask thread in android.
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout 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" tools:context=".MainActivity"> <Button android:id="@+id/btnDo" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@id/btnCancel" android:layout_centerInParent="true" android:layout_marginBottom="25sp" android:text="Do AsyncTask" /> <Button android:id="@+id/btnCancel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@id/textView" android:layout_centerInParent="true" android:layout_marginBottom="20dp" android:text="Cancel" /> <TextView android:id="@+id/textView" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_centerInParent="true" android:textSize="20sp" android:gravity="center_horizontal" /> </RelativeLayout>
Step 3 − Add the following code to src/MainActivity.java
import android.graphics.Color;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private Button btnDo, btnCancel;
private TextView textView;
private AsyncTask myTask;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnDo = findViewById(R.id.btnDo);
btnCancel = findViewById(R.id.btnCancel);
textView = findViewById(R.id.textView);
btnDo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
textView.setText("");
myTask = new DownloadTask().execute("Task1",
"Task2", "Task3", "Task4", "Task5");
}
});
btnCancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
myTask.cancel(true);
}
});
}
private class DownloadTask extends AsyncTask<String, Integer, List<String>> {
@Override
protected void onPreExecute() {
super.onPreExecute();
textView.setTextColor(Color.BLUE);
textView.setText(textView.getText() + "
Starting Task....");
}
@Override
protected List<String> doInBackground(String... tasks) {
int count = tasks.length;
List<String> taskList= new ArrayList<>(count);
for(int i =0;i<count;i++){
String currentTask = tasks[i];
taskList.add(currentTask);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
publishProgress((int) (((i+1) / (float) count) * 100));
if(isCancelled()){
break;
}
}
return taskList;
}
@Override
protected void onCancelled() {
super.onCancelled();
textView.setTextColor(Color.RED);
textView.setText(textView.getText() + "
Operation is cancelled..");
}
@Override
protected void onProgressUpdate(Integer... progress) {
super.onProgressUpdate(progress);
textView.setText(textView.getText()+ "
Completed:)" + progress[0] + "%");
}
@Override
protected void onPostExecute(List<String> result) {
super.onPostExecute(result);
textView.setText(textView.getText() + "
Done....");
for (int i=0;i<result.size();i++){
textView.setText(textView.getText() + "
" +
result.get(i));
}
}
}
}Step 4 − Add the following code to androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run 
icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −
Updated on: 02-Jul-2020
308 Views
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