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Android/非同期処理/HandlerRunnable

提供: 初心者エンジニアの簡易メモ
2020年8月7日 (金) 16:02時点におけるAdmin (トーク | 投稿記録)による版

移動: 案内検索

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();
<pre>

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);
                    }
                }
            });
        }
    }
}

参考:https://www.it-swarm.dev/ja/java/%E3%82%8F%E3%81%8B%E3%82%8A%E3%82%84%E3%81%99%E3%81%84%E8%AA%AC%E6%98%8E%E3%81%A7%E3%80%81java%E3%81%A7runnable%E3%81%A8%E3%81%AF%E4%BD%95%E3%81%A7%E3%81%99%E3%81%8B%EF%BC%9F/1070599643/