Android/非同期処理/HandlerRunnable
提供: 初心者エンジニアの簡易メモ
AsyncTaskはAndroid11から非推奨となったので非同期処理はこちら推奨。
サンプル
final TextView textView = findViewById(R.id.text1);
final Handler handler = new Handler(Looper.getMainLooper());
new Thread(new Runnable() {
@Override
public void run() {
final String msg = "background exec";
if (handler != null) {
handler.post(new Runnable() {
@Override
public void run() {
if (textView != null) {
textView.setText(msg);
}
}
});
}
}
}).start();
参考：https://qiita.com/8yabusa/items/f8c9bb7eb81175c49e97
サンプル(Runnableクラス切り分け)
MainActivity.java
final TextView textView = findViewById(R.id.text1); final Handler handler = new Handler(Looper.getMainLooper()); MyRunnableTask task = new MyRunnableTask(handler, textView); new Thread(task).start();
MyRunnableTask.java
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);
}
}
});
}
}
}
