按下按钮时如何更改图像视图的图标？

Question

我的 Android 项目中有 3 个 imageview。单击按钮时应将其更改为图标。当释放点击时，它应该是默认图标。在我的代码中，它会在单击按钮时更改图标，但它会永久更改图标，直到单击此 Activity 的后退按钮。它应该只在单击按钮时将 mainpage_acil_icon_p 替换为 mainpage_acil_icon。

我该如何解决这个问题？

activity_mainpage.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/Linear_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#000000"
        android:orientation="vertical">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginBottom="10dp"
            android:alpha=".85"
            android:background="@drawable/mainpage_background"
            android:orientation="vertical"
            android:weightSum="60">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="0dip"
                android:layout_weight="40"
                android:orientation="vertical">
                <TextView
                    android:id="@+id/textView2"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="EMAS"
                    android:textAlignment="center"
                    android:textColor="@color/colorWhite"
                    android:textSize="18sp"
                    android:textStyle="bold" />
            </LinearLayout>
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="0dip"
                android:layout_weight="20"
                android:orientation="vertical">
                <View
                    android:layout_width="match_parent"
                    android:layout_height="1dp"
                    android:background="#c7c7c8"/>

                <include layout="@layout/mainpage_inner_part" />
            </LinearLayout>
        </LinearLayout>
    </LinearLayout>

MainPageActivity.java

public class MainPageActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_mainpage);

      ListView list;
    final String[] web = {
            getString(R.string.mainpage_acil),
            getString(R.string.mainpage_bildirim),
            getString(R.string.mainpage_isguveligi),
    };
    Integer[] imageId = {
            R.drawable.mainpage_acil_icon_p,
            R.drawable.mainpage_bildirim_icon_p,
            R.drawable.mainpage_isguvenligi_icon_p,
    };
    CustomListMainPage adapter = new
            CustomListMainPage(MainPageActivity.this, web, imageId);
    list = (ListView) findViewById(R.id.list);
    list.setAdapter(adapter);
    list.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                                int position, long id) {
            Log.v("Pozisyon", String.valueOf(position));
            Intent intentPos;
            ImageView imageView= (ImageView) view.findViewById(R.id.img);
            boolean flag=false;
            switch (position) {
                case 0 :
                    //Toast.makeText(MainPageActivity.this, "You Clicked at " + web[+position], Toast.LENGTH_SHORT).show();
                    imageView.setImageResource(R.drawable.mainpage_acil_icon);
                    intentPos=new Intent(MainPageActivity.this,EmergencyActivity.class);
                    startActivity(intentPos);
                    break;

                case 1 :
                    imageView.setImageResource(R.drawable.mainpage_bildirim_icon);
                    intentPos=new Intent(MainPageActivity.this,NotificationPage.class);
                    startActivity(intentPos);                     break;

                case 2 :
                    imageView.setImageResource(R.drawable.mainpage_isguvenligi_icon);
                    intentPos=new Intent(MainPageActivity.this,JobSecurityActivity.class);
                    startActivity(intentPos);
                    break;

                default :
                    System.out.println("Hatali secim! 1, 2 ya da 3'e basiniz.");
                    break;
            }
        }
    });
}

}

Answer 1

我认为最简单的方法是使用选择器。

在您的 activity 布局文件中，将 ImageView 替换为 Button 并将选择器设置为背景。

在您的 activity 布局中：

<Button
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="Button"
  android:background="@drawable/btn_selector"
  android:id="@+id/button"/>

这里是 btn_selector.xml 文件

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:state_checked="true" android:state_pressed="true" android:drawable="@drawable/mainpage_acil_icon" />
  <item android:state_pressed="true" android:drawable="@drawable/mainpage_acil_icon"/>
  <item android:state_checked="true" android:drawable="@drawable/mainpage_acil_icon"/>
  <item android:drawable="@drawable/mainpage_acil_icon_p"/>
</selector>

将此选择器文件放入您的 res/drawable 文件夹中。我想这会对你有所帮助。

按下按钮时如何更改图像视图的图标？

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