Android AsyncTaskLoader，Java

Android AsyncTaskLoader，Java

 

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.loader.content.AsyncTaskLoader;

import android.os.Bundle;
import android.os.Looper;
import android.os.SystemClock;
import android.util.Log;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(getApplicationContext(), System.currentTimeMillis() + "", Toast.LENGTH_SHORT).show();
            }
        });

        print("Main Thread id:" + Looper.getMainLooper().getThread().getId());
        print("onCreate");

        AsyncTaskLoader asyncTaskLoader = new AsyncTaskLoader(this) {
            @Override
            protected void onStartLoading() {
                super.onStartLoading();
                print("onStartLoading");
                this.forceLoad();
            }

            @Override
            protected void onForceLoad() {
                super.onForceLoad();

                print("onForceLoad");
            }

            @Nullable
            @Override
            public String loadInBackground() {
                print("loadInBackground");

                SystemClock.sleep(15_000);

                return "后台线程结束";
            }

            @Override
            public void deliverResult(@Nullable String data) {
                print("deliverResult");
                print(data);
            }

            @Override
            protected boolean onCancelLoad() {
                print("onCancelLoad");
                return super.onCancelLoad();
            }

            @Override
            protected void onStopLoading() {
                print("onStopLoading");
            }
        };

        asyncTaskLoader.startLoading();

        SystemClock.sleep(1000);

        asyncTaskLoader.cancelLoad();//突然结束
    }

    private void print(String s) {
        Log.d("zhangphil", Thread.currentThread().getId() + " - " + s);
    }
}