回答編集履歴
2
不要な import を削除
answer
CHANGED
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@@ -37,8 +37,6 @@
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37
37
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import android.widget.ScrollView;
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38
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import android.widget.TextView;
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39
39
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40
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-
import java.util.Timer;
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41
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-
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40
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public class MainActivity extends AppCompatActivity {
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private ScrollStopDetector scrollStopDetector;
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42
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@Override
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1
コード追加
answer
CHANGED
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@@ -1,1 +1,119 @@
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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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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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2
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+
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3
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kotlin が使えないため java で失礼します.
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4
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非常にざっくりです.
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5
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+
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6
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activity_main.xml
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7
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```xml
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8
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<?xml version="1.0" encoding="utf-8"?>
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9
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<androidx.constraintlayout.widget.ConstraintLayout
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10
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xmlns:android="http://schemas.android.com/apk/res/android"
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11
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xmlns:tools="http://schemas.android.com/tools"
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12
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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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15
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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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20
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21
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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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27
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```
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28
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MainActivity.java
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29
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```java
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30
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package com.teratail.q218060;
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31
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32
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import androidx.appcompat.app.AppCompatActivity;
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33
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34
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import android.os.Bundle;
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35
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import android.util.Log;
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36
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import android.view.View;
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37
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import android.widget.ScrollView;
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38
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import android.widget.TextView;
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39
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40
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import java.util.Timer;
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41
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42
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public class MainActivity extends AppCompatActivity {
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43
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private ScrollStopDetector scrollStopDetector;
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44
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@Override
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45
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protected void onCreate(Bundle savedInstanceState) {
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46
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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48
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49
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TextView textView = findViewById(R.id.textView);
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50
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for(int i=1; i<=50; i++) textView.append(i+"\n");
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51
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52
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ScrollView scrollView = findViewById(R.id.scrollView);
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53
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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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56
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Log.d("MainActivity", "Scroll STOP");
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}
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58
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});
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scrollView.setOnScrollChangeListener(scrollStopDetector);
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60
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61
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scrollStopDetector.start();
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}
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63
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@Override
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64
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protected void onDestroy() {
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65
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super.onDestroy();
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66
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scrollStopDetector.finish();
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67
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}
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68
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}
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69
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```
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70
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ScrollStopDetector.java
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71
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```java
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72
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package com.teratail.q218060;
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73
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74
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import android.view.View;
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75
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import android.widget.ScrollView;
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76
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77
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class ScrollStopDetector implements View.OnScrollChangeListener {
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78
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interface Listener {
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79
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void stopped(View v);
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80
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}
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81
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82
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private class Sleeper implements Runnable {
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83
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@Override
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84
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public void run() {
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85
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while(!finish) {
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86
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try {
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87
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Thread.sleep(millis); //[ms]
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88
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listener.stopped(view);
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89
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} catch(InterruptedException ignore) {
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90
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}
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91
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}
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92
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}
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93
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}
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94
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95
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private ScrollView view;
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96
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private long millis;
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97
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private Listener listener;
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98
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private Thread thread;
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99
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private boolean finish;
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100
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101
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ScrollStopDetector(ScrollView view, long millis, Listener listener) {
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102
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this.view = view;
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103
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this.millis = millis;
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104
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this.listener = listener;
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105
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}
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106
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void start() {
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107
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thread = new Thread(new Sleeper());
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108
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thread.start();
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109
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}
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110
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void finish() {
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111
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finish = true;
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112
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}
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113
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+
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114
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@Override
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115
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public void onScrollChange(View v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
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116
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if(thread != null) thread.interrupt();
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117
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}
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118
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}
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119
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+
```
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