Android/非同期処理/HandlerRunnable

サンプル(Runnableクラス切り分け)

MainActivity.java

TextView textView = findViewById(R.id.text1);
final Handler handler = new Handler(Looper.getMainLooper());
MyRunnableTask task = new MyRunnableTask(handler, textView);
Executors.newSingleThreadExecutor().execute(task);
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MyRunnableTask.java
<pre>
import android.os.Handler;
import android.widget.TextView;
public class MyRunnableTask implements Runnable {
    Handler mHandler;
    TextView mTextView;
    public MyRunnableTask(Handler handler, TextView textView) {
        mHandler = handler;
        mTextView = textView;
    }
    public void run() {
        final String msg = "background exec";
        if (mHandler != null) {
            mHandler.post(new Runnable() {
                @Override
                public void run() {
                    if (mTextView != null) {
                        mTextView.setText(msg);
                    }
                }
            });
        }
    }
}