回答編集履歴
2
コード追加
test
CHANGED
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@@ -17,3 +17,237 @@
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離す→ MotionEvent.ACTION_UP(MotionEvent.ACTION_CANCEL もかな?)
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となってそれぞれ処理が出来たように思います。
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----
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AlphaButton.java
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```java
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package com.teratail.q360078;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.widget.ImageView;
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import androidx.annotation.*;
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/*** 半透明になるエフェクトのボタン ***/
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public class AlphaButton extends androidx.appcompat.widget.AppCompatButton {
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public AlphaButton(@NonNull Context context) {
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super(context);
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}
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public AlphaButton(@NonNull Context context, @Nullable AttributeSet attrs) {
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super(context, attrs);
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}
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public AlphaButton(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
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super(context, attrs, defStyleAttr);
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}
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@Override
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public void setPressed(boolean pressed) {
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if(pressed) {
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this.setAlpha(0.75f);
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} else {
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this.setAlpha(1.0f);
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}
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super.setPressed(pressed);
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}
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@Override
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public boolean performClick() {
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super.performClick();
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return true;
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}
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}
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```
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MainActivity.java
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```java
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package com.teratail.q360078;
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import androidx.appcompat.app.AppCompatActivity;
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import androidx.appcompat.widget.AppCompatButton;
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import android.os.Bundle;
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import android.util.Log;
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import android.view.*;
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import android.widget.*;
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public class MainActivity extends AppCompatActivity {
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private static final String TAG = "MainActivity";
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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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ImageView comment_img = findViewById(R.id.comment_img);
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AlphaButton button = findViewById(R.id.button);
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button.setOnTouchListener(new View.OnTouchListener() {
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@Override
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public boolean onTouch(View v, MotionEvent event) {
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//Log.d(TAG, "event="+event);
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switch(event.getAction()) {
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case MotionEvent.ACTION_UP:
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case MotionEvent.ACTION_CANCEL: //念の為
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comment_img.setImageDrawable(null);
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break;
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case MotionEvent.ACTION_DOWN:
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comment_img.setImageResource(R.drawable.image_6483441);
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break;
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}
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return false;
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}
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});
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}
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}
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```
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レイアウト: 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:app="http://schemas.android.com/apk/res-auto"
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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=".MainActivity">
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<ImageView
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android:id="@+id/comment_img"
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android:layout_width="0dp"
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android:layout_height="100dp"
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app:layout_constraintBottom_toTopOf="@id/button"
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app:layout_constraintLeft_toLeftOf="parent"
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app:layout_constraintRight_toRightOf="parent"
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app:layout_constraintTop_toTopOf="parent" />
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<com.teratail.q360078.AlphaButton
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android:id="@+id/button"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="Hello World!"
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app:layout_constraintBottom_toBottomOf="parent"
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app:layout_constraintLeft_toLeftOf="parent"
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app:layout_constraintRight_toRightOf="parent"
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app:layout_constraintTop_toBottomOf="@id/comment_img" />
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</androidx.constraintlayout.widget.ConstraintLayout>
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```
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1
修正
test
CHANGED
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@@ -10,6 +10,10 @@
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10
10
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11
11
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12
12
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13
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-
setOnTouchListener を Button に登録することで、MotionEvent の getAction()が
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setOnTouchListener を Button に登録することで、MotionEvent の getAction()が
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15
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押す→ MotionEvent.ACTION_DOWN
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-
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17
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離す→ MotionEvent.ACTION_UP(MotionEvent.ACTION_CANCEL もかな?)
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18
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19
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となってそれぞれ処理が出来たように思います。
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