无法在MainActivity（子类）中查看在BaseActivity（父类）中创建的progressBar？

huangapple
go评论126阅读模式
英文:

Cannot view progressBar created in BaseActivity(parent) in MainActivity(child)?

问题

以下是翻译好的部分：

我正在尝试为所有重复的操作创建一个单一的基本活动。我尝试将进度条放在BaseActivity中，并尝试在MainActivity中扩展它，但它根本不显示出来。

activity_base.xml

  1. <?xml version="1.0" encoding="utf-8"?>
  2. <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
  3.     xmlns:app="http://schemas.android.com/apk/res-auto"
  4.     android:layout_width="match_parent"
  5.     android:layout_height="match_parent">
  7.     <FrameLayout
  8.         android:id="@+id/activity_content"
  9.         android:layout_width="match_parent"
  10.         android:layout_height="match_parent">
  13.     </FrameLayout>
  15.     <ProgressBar
  16.         android:id="@+id/progressBar"
  17.         android:indeterminate="true"
  18.         android:layout_width="wrap_content"
  19.         android:layout_height="wrap_content"
  20.         app:layout_constraintBottom_toBottomOf="parent"
  21.         app:layout_constraintLeft_toLeftOf="parent"
  22.         app:layout_constraintRight_toRightOf="parent"
  23.         app:layout_constraintTop_toTopOf="parent" />
  25. </androidx.constraintlayout.widget.ConstraintLayout>

BaseActivity.java

  1. public abstract class BaseActivity extends AppCompatActivity {
  3.     private static final String TAG = "BaseActivity";
  5.     public ProgressBar progressBar;
  7.     @Override
  8.     public void setContentView(int layoutResID) {
  10.         ConstraintLayout constraintLayout = (ConstraintLayout) getLayoutInflater().inflate(R.layout.activity_base, null);
  11.         FrameLayout frameLayout = constraintLayout.findViewById(R.id.activity_content);
  12.         progressBar = constraintLayout.findViewById(R.id.progressBar);
  13.         Log.i(TAG, "setContentView: Progressbar" + progressBar.getVisibility());
  15.         getLayoutInflater().inflate(layoutResID, frameLayout, true);
  16.         super.setContentView(layoutResID);
  17.     }
  19.     public void showProgressBar(boolean visibility) {
  20.         progressBar.setVisibility(visibility ? View.VISIBLE : View.GONE);
  21.     }
  22. }

MainActivity.java

  1. public class MainActivity extends BaseActivity {
  3.     @Override
  4.     protected void onCreate(Bundle savedInstanceState) {
  5.         super.onCreate(savedInstanceState);
  6.         setContentView(R.layout.activity_main);
  7.         btn_get_data = (Button) findViewById(R.id.btn_get_data);
  9.         btn_get_data.setOnClickListener(view -> {
  11.             if (progressBar.getVisibility() == View.VISIBLE) {
  12.                 Log.i(TAG, "onCreate: DISABLING PROGRESS BAR");
  13.                 showProgressBar(false);
  14.             } else {
  15.                 showProgressBar(true);
  16.             }
  18.         });
  19.     }
  20. }

此外，在应用中还有其他内容，但与进度条无关。是的，我已正确声明了按钮和其他内容。

提前感谢！

英文:

I am trying to make a single base activity for all the redundant actions. I tried putting the progress bar in BaseActivity and tried extending it in MainActivity, But it is not showing up at all.
My Code

activity_base.xml

  1. &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
  2. &lt;androidx.constraintlayout.widget.ConstraintLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
  3.     xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;
  4.     android:layout_width=&quot;match_parent&quot;
  5.     android:layout_height=&quot;match_parent&quot;&gt;
  7.     &lt;FrameLayout
  8.         android:id=&quot;@+id/activity_content&quot;
  9.         android:layout_width=&quot;match_parent&quot;
  10.         android:layout_height=&quot;match_parent&quot;&gt;
  13.     &lt;/FrameLayout&gt;
  15.     &lt;ProgressBar
  16.         android:id=&quot;@+id/progressBar&quot;
  17.         android:indeterminate=&quot;true&quot;
  18.         android:layout_width=&quot;wrap_content&quot;
  19.         android:layout_height=&quot;wrap_content&quot;
  20.         app:layout_constraintBottom_toBottomOf=&quot;parent&quot;
  21.         app:layout_constraintLeft_toLeftOf=&quot;parent&quot;
  22.         app:layout_constraintRight_toRightOf=&quot;parent&quot;
  23.         app:layout_constraintTop_toTopOf=&quot;parent&quot; /&gt;
  25. &lt;/androidx.constraintlayout.widget.ConstraintLayout&gt;

BaseActivity.java

  1. public abstract class BaseActivity extends AppCompatActivity {
  3.     private static final String TAG = &quot;BaseActivity&quot;;
  5.     public ProgressBar progressBar;
  7.     @Override
  8.     public void setContentView(int layoutResID) {
  10.         ConstraintLayout constraintLayout = (ConstraintLayout) getLayoutInflater().inflate(R.layout.activity_base, null);
  11.         FrameLayout frameLayout = constraintLayout.findViewById(R.id.activity_content);
  12.         progressBar = constraintLayout.findViewById(R.id.progressBar);
  13.         Log.i(TAG, &quot;setContentView: Progressbar&quot; + progressBar.getVisibility());
  15.         getLayoutInflater().inflate(layoutResID, frameLayout, true);
  16.         super.setContentView(layoutResID);
  17.     }
  19.     public void showProgressBar(boolean visibility) {
  20.         progressBar.setVisibility(visibility ? View.VISIBLE : View.GONE);
  21.     }
  22. }

MainActivity.java

  2. public class MainActivity extends BaseActivity {
  4.  @Override
  5.     protected void onCreate(Bundle savedInstanceState) {
  6.         super.onCreate(savedInstanceState);
  7.         setContentView(R.layout.activity_main);
  8.         btn_get_data = (Button) findViewById(R.id.btn_get_data);
  10.         btn_get_data.setOnClickListener(view -&gt; {
  13.        if (progressBar.getVisibility() == View.VISIBLE) {
  14.                 Log.i(TAG, &quot;onCreate: DISABLING PROGRESS BAR&quot;);
  15.                 showProgressBar(false);
  16.             } else {
  17.                 showProgressBar(true);
  18.             }
  20.    }
  23. }

There are other things in the app, but they have no connection with the progress bar. And yes I have declared the button and other things properly.

Thanks in advance!

答案1

得分: 3

将setContentView()方法中的以下代码：

  1. super.setContentView(layoutResID);

更改为：

  1. super.setContentView(constraintLayout);

在BaseActivity中进行这个修改。

英文:

Change

  1. super.setContentView(layoutResID);

to

  1. super.setContentView(constraintLayout);

in setContentView() method of the BaseActivity.

huangapple
  • 本文由 发表于 2020年8月4日 15:36:18
  • 转载请务必保留本文链接：https://go.coder-hub.com/63242159.html
  • android
  • android-progressbar
  • java
匿名

发表评论

匿名网友

:?: :razz: :sad: :evil: :!: :smile: :oops: :grin: :eek: :shock: :???: :cool: :lol: :mad: :twisted: :roll: :wink: :idea: :arrow: :neutral: :cry: :mrgreen:

确定