如何从Java文件中更改可绘制资源的来源？

huangapple
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英文:

How to change drawable source from java file?

问题

Java文件：

  1. public void LanguageButtonClick(View view)
  2. {
  3.     Button lngBtn = findViewById(R.id.languageButton);
  5.     if(currentLanguage == Languages.English)
  6.     {
  7.         currentLanguage = Languages.Polish;
  8.         lngBtn.setText("pl");
  9.         // 设置 android:drawableLeft="@drawable/ic_poland"
  10.     }
  11.     else if (currentLanguage == Languages.Polish)
  12.     {
  13.         currentLanguage = Languages.English;
  14.         lngBtn.setText("eng");
  15.         // 设置 android:drawableLeft="@drawable/ic_united_kingdom"
  16.     }
  17. }

XML文件：

  1. <Button
  2.     android:onClick="LanguageButtonClick"
  3.     android:id="@+id/languageButton"
  4.     android:layout_width="wrap_content"
  5.     android:layout_height="wrap_content"
  6.     android:layout_marginTop="16dp"
  7.     android:layout_marginRight="16dp"
  8.     android:width="125dp"
  9.     android:height="45dp"
  10.     android:background="@drawable/language_button"
  11.     android:drawableLeft="@drawable/ic_united_kingdom" <!-- 这部分 -->
  12.     android:text="@string/eng"
  13.     android:textSize="18sp"
  14.     android:textStyle="bold"
  15.     app:backgroundTint="#FFFFFF"
  16.     app:backgroundTintMode="multiply"
  17.     app:layout_constraintEnd_toEndOf="parent"
  18.     app:layout_constraintTop_toTopOf="parent" />
英文:

So, I have a button to switch current language. It shows flag and country name next to it [(Flag) ENG] I want to change text and image when user clicks it, so it changes application language and displays current. I know how to change text, but have no clue how to make image change it source

Java file

  1. public void LanguageButtonClick(View view)
  2. {
  3.     Button lngBtn = findViewById(R.id.languageButton);
  5.     if(currentLanguage == Languages.English)
  6.     {
  7.         currentLanguage = Languages.Polish;
  8.         lngBtn.setText(&quot;pl&quot;);
  9.         //Set android:drawableLeft=&quot;@drawable/ic_poland&quot;
  10.     }
  11.     else if (currentLanguage == Languages.Polish)
  12.     {
  13.         currentLanguage = Languages.English;
  14.         lngBtn.setText(&quot;eng&quot;);
  15.         ///Set android:drawableLeft=&quot;@drawable/ic_united_kingdom&quot;
  16.     }
  17. }

xml file

  1. &lt;Button
  2.     android:onClick=&quot;LanguageButtonClick&quot;
  3.     android:id=&quot;@+id/languageButton&quot;
  4.     android:layout_width=&quot;wrap_content&quot;
  5.     android:layout_height=&quot;wrap_content&quot;
  6.     android:layout_marginTop=&quot;16dp&quot;
  7.     android:layout_marginRight=&quot;16dp&quot;
  8.     android:width=&quot;125dp&quot;
  9.     android:height=&quot;45dp&quot;
  10.     android:background=&quot;@drawable/language_button&quot;
  11.     android:drawableLeft=&quot;@drawable/ic_united_kingdom&quot; &lt;------------------This one
  12.     android:text=&quot;@string/eng&quot;
  13.     android:textSize=&quot;18sp&quot;
  14.     android:textStyle=&quot;bold&quot;
  15.     app:backgroundTint=&quot;#FFFFFF&quot;
  16.     app:backgroundTintMode=&quot;multiply&quot;
  17.     app:layout_constraintEnd_toEndOf=&quot;parent&quot;
  18.     app:layout_constraintTop_toTopOf=&quot;parent&quot; /&gt;

答案1

得分: 0

  1. 您可以使用 `setCompoundDrawables` 方法
  3. ```java
  4. Drawable drawable = getContext().getResources().getDrawable(R.drawable.ic_united_kingdom);
  5. lngBtn.setCompoundDrawables(drawable, null, null, null);

以下是完整代码

  1. public void LanguageButtonClick(View view)
  2. {
  3.     Button lngBtn = findViewById(R.id.languageButton);
  5.     if(currentLanguage == Languages.English)
  6.     {
  7.         currentLanguage = Languages.Polish;
  8.         lngBtn.setText("pl");
  9.         Drawable drawable = getContext().getResources().getDrawable(R.drawable.ic_poland);
  10.         lngBtn.setCompoundDrawables(drawable, null, null, null);
  11.     }
  12.     else if (currentLanguage == Languages.Polish)
  13.     {
  14.         currentLanguage = Languages.English;
  15.         lngBtn.setText("eng");
  16.         Drawable drawable = getContext().getResources().getDrawable(R.drawable.ic_united_kingdom);
  17.         lngBtn.setCompoundDrawables(drawable, null, null, null);
  18.     }
  19. }
英文:

You can use the setCompoundDrawables

  1. Drawable drawable = getContext().getResources().getDrawable(R.drawable.ic_united_kingdom);
  2. lngBtn.setCompoundDrawables(drawable, null, null, null);

Here's the full code

  1. public void LanguageButtonClick(View view)
  2. {
  3.     Button lngBtn = findViewById(R.id.languageButton);
  5.     if(currentLanguage == Languages.English)
  6.     {
  7.         currentLanguage = Languages.Polish;
  8.         lngBtn.setText(&quot;pl&quot;);
  9.         Drawable drawable = getContext().getResources().getDrawable(R.drawable.ic_poland);
  10.     lngBtn.setCompoundDrawables(drawable, null, null, null);
  11.     }
  12.     else if (currentLanguage == Languages.Polish)
  13.     {
  14.         currentLanguage = Languages.English;
  15.         lngBtn.setText(&quot;eng&quot;);
  16.         Drawable drawable = getContext().getResources().getDrawable(R.drawable.ic_united_kingdom);
  17.     lngBtn.setCompoundDrawables(drawable, null, null, null);
  18.     }
  19. }

huangapple
  • 本文由 发表于 2020年10月26日 01:08:04
  • 转载请务必保留本文链接：https://go.coder-hub.com/64526512.html
  • android
  • android-studio
  • java
  • xml
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