回答編集履歴
2
不要な import を削除
test
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@@ -76,10 +76,6 @@
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import java.util.Timer;
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public class MainActivity extends AppCompatActivity {
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private ScrollStopDetector scrollStopDetector;
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コード追加
test
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@@ -1 +1,237 @@
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1
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時間の監視でよろしければ, スクロールしたらリセットするタイマーを作り, そのタイマーが1秒経過したら「停止中」と判断しては如何でしょうか.
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kotlin が使えないため java で失礼します.
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非常にざっくりです.
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activity_main.xml
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```xml
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<?xml version="1.0" encoding="utf-8"?>
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<androidx.constraintlayout.widget.ConstraintLayout
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xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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tools:context="com.teratail.q218060.MainActivity">
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<ScrollView
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:id="@+id/scrollView">
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<TextView
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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android:id="@+id/textView"/>
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</ScrollView>
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</androidx.constraintlayout.widget.ConstraintLayout>
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```
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MainActivity.java
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```java
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package com.teratail.q218060;
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import androidx.appcompat.app.AppCompatActivity;
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import android.os.Bundle;
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import android.util.Log;
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import android.view.View;
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import android.widget.ScrollView;
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import android.widget.TextView;
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import java.util.Timer;
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public class MainActivity extends AppCompatActivity {
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private ScrollStopDetector scrollStopDetector;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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TextView textView = findViewById(R.id.textView);
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for(int i=1; i<=50; i++) textView.append(i+"\n");
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ScrollView scrollView = findViewById(R.id.scrollView);
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scrollStopDetector = new ScrollStopDetector(scrollView, 1000, new ScrollStopDetector.Listener() {
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@Override
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public void stopped(View v) {
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Log.d("MainActivity", "Scroll STOP");
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}
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});
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scrollView.setOnScrollChangeListener(scrollStopDetector);
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scrollStopDetector.start();
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}
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@Override
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protected void onDestroy() {
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super.onDestroy();
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scrollStopDetector.finish();
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}
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}
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```
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ScrollStopDetector.java
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```java
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package com.teratail.q218060;
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import android.view.View;
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import android.widget.ScrollView;
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class ScrollStopDetector implements View.OnScrollChangeListener {
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interface Listener {
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void stopped(View v);
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}
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private class Sleeper implements Runnable {
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@Override
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public void run() {
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while(!finish) {
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try {
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Thread.sleep(millis); //[ms]
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listener.stopped(view);
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} catch(InterruptedException ignore) {
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}
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}
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}
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}
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private ScrollView view;
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private long millis;
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private Listener listener;
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private Thread thread;
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private boolean finish;
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ScrollStopDetector(ScrollView view, long millis, Listener listener) {
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this.view = view;
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this.millis = millis;
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this.listener = listener;
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}
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void start() {
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thread = new Thread(new Sleeper());
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thread.start();
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}
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void finish() {
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finish = true;
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}
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@Override
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public void onScrollChange(View v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
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if(thread != null) thread.interrupt();
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}
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}
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```
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