如何在Android Studio中同时在两个活动中动态创建一个TextView?

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英文:

How can I create dynamically a TextView simultaneously in two activities in android studio?

问题

I have two activities, in activityOne the user will dynamically create textViews and I want that in the same time to dynamically create textViews with the same content inside activityTwo.
For example:
In activityOne the user will dynamically create a textView "Groceries" I want that in the same time in activityTwo to be dynamically created a textView with the same name: "Groceries".

英文:

I have two activities, in activityOne the user will dynamically create textViews and I want that in the same time to dynamically create textViews with the same content inside activityTwo.
For example:
In activityOne the user will dynamically create a textView "Groceries" I want that in the same time in activityTwo to be dynamically created a textView with the same name: "Groceries".

答案1

得分: 0

以下是代码的中文翻译部分:

您可以使用数据仓库类如下所示

public class DataRepository {

    private static final DataRepository INSTANCE = new DataRepository();

    private final MutableLiveData<String> text = new MutableLiveData<>();

    public void updateText(String newText){
        text.setValue(newText);
    }

    public MutableLiveData<String> getText() {
        return text;
    }

    public static DataRepository getInstance(){
        return INSTANCE;
    }

}

然后,您可以使用类似以下方式的 Observer 来监听数据的变化:

DataRepository dataRepository = DataRepository.getInstance();
dataRepository.getText().observe(this, new Observer<String>() {
    @Override
    public void onChanged(String newText) {
        textView.setText(newText);
    }
});

其中,this 指的是 Activity。

要更新文本,只需在程序的任何地方调用如下:

DataRepository dataRepository = DataRepository.getInstance();
dataRepository.updateText("新文本");

观察者会自动更新所有内容。

英文:

You can use a data repository class as such

public class DataRepository {

    private static final DataRepository INSTANCE = new DataRepository();

    private final MutableLiveData&lt;String&gt; text = new MutableLiveData&lt;&gt;();

    public void updateText(String newText){
        text.setValue(newText);
    }

    public MutableLiveData&lt;String&gt; getText() {
        return text;
    }

    public static DataRepository getInstance(){
        return INSTANCE;
    }

}

You can then listen to changes on the data using an Observer like so

DataRepository dataRepository = DataRepository.getInstance();
dataRepository.getText().observe(this, new Observer&lt;String&gt;() {
    @Override
    public void onChanged(String newText) {
        textView.setText(newText);
    }
});

Where this refers to the Activity.

To update the text, simply call

DataRepository dataRepository = DataRepository.getInstance();
dataRepository.updateText(&quot;New text&quot;);

From anywhere in your program. The observers will update everything for you automatically.

huangapple
  • 本文由 发表于 2020年7月31日 02:56:44
  • 转载请务必保留本文链接:https://go.coder-hub.com/63179626.html
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