Question

我一直在网上寻找最有效和最干净的方式，以便在Android中以编程方式向视图添加元素，但我从来没有找到适合我想做的事情的方法。尽管我想使用推荐的工作方式（在XML文件中定义布局），但我将在下一部分中解释一些限制。

这就是我想要实现的目标。我有一个显示默认视图的活动（已在覆盖的onCreate方法中调用setContentView）。

我需要能够显示几个＆＃34;弹出＆＃34;风格消息，根据我的阅读，有两种方法，弹出窗口和 DialogFragments 。后者似乎更适合我，因为我在DialogFragment本身有一些特定的自定义（这是一个与扩展DialogFragment的活动分开的类）。

现在，我在XML文档中为对话框片段定义了一个简单的线性布局，但问题是，我需要向其中添加微调器，而且我从来不知道需要添加多少（因此，我可以＆＃39;在XML文件中手动定义微调器。）

我已经读过一些关于通货膨胀的内容，但从我的理解来看，它只是实例化了视图，因此它变得可见＆＃34;可见＆＃34;和＆＃34;可操纵＆＃34;在运行时但我的代码似乎确实被考虑在内。（调用show方法时，视图不显示任何微调器。）

活动类：

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    dbSwipeFM = getSupportFragmentManager();
    drawView = new DrawingView(this,dbUtils); 
            [...]
    setContentView(drawView);

    drawView.requestFocus();

}

public void showColumnSelectionDialogFragment(ArrayList<Shape> shapesColToShow){
    new ColumnSelectionDialog().show(dbSwipeFM, "fragment_edit_name");
}

从另一个类调用showColumnSelectionDialogFragment方法。

ColumnSelectionDialog类[编辑最后版本]：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    //View view = inflater.inflate(R.layout.fragment_edit_name, container);
    View view = new LinearLayout(getActivity());

    DBUtils dbManager = DBUtils.get();

    //to count pairs
    int pairCount = 0;

    LinearLayout horizontalLayoutForTables = new LinearLayout(view.getContext()),
                 horizontalLayoutForCols = new LinearLayout(view.getContext());

    //set layout to be horizontal
    horizontalLayoutForTables.setOrientation(LinearLayout.HORIZONTAL);
    horizontalLayoutForTables.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT)); 
    horizontalLayoutForCols.setOrientation(LinearLayout.HORIZONTAL);
    horizontalLayoutForCols.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));

    ArrayList<Shape> dbManagerCurrentlySelectedTables = dbManager.getCurrentRequestSelectedTables();

    ArrayList<String> allAvailableTables = new ArrayList<String>();

    //((LinearLayout) view).addView(new TextView(view.getContext()));
    //get the names of all table elements
    for(int k =0; k < dbManager.getCurrentRequestSelectedTables().size(); k++){
        allAvailableTables.add(dbManager.getCurrentRequestSelectedTables().get(k).getDbElement().getElementName());
    }

    for(int i = 0; i < dbManager.getCurrentRequestSelectedTables().size(); i++){
        if(pairCount >= 1){
            System.out.println("Adding layouts to view");
            ((LinearLayout) view).addView(horizontalLayoutForTables);
            ((LinearLayout) view).addView(horizontalLayoutForCols);
            horizontalLayoutForTables = new LinearLayout(view.getContext());
            horizontalLayoutForCols = new LinearLayout(view.getContext());
            pairCount = 0;
        }
        //create a new spinner containing all the tables
        Spinner tableSpinner = new Spinner(view.getContext());
        tableSpinner.setAdapter(new SelectionDialogSpinnerAdapter(allAvailableTables));

        //create a corresponding spinner for the columns of the current table only.
        Spinner tableColumnSpinner = new Spinner(view.getContext());
        ArrayList<String> columnNamesOnly = new ArrayList<String>();//get the column names only for the spinner
        for(int j = 0; j < dbManagerCurrentlySelectedTables.get(i).getDbElement().getColumns().size(); j++){
            columnNamesOnly.add(dbManagerCurrentlySelectedTables.get(i).getDbElement().getColumns().get(j).getColumnName());
        }
        tableColumnSpinner.setAdapter(new SelectionDialogSpinnerAdapter(columnNamesOnly));

        //add to layout
        System.out.println("Adding spinners to layout");
        horizontalLayoutForTables.addView(tableSpinner);
        horizontalLayoutForCols.addView(tableColumnSpinner);

        pairCount++;
    }

    //view = inflater.inflate(R.layout.fragment_edit_name, container);

    getDialog().setTitle(R.string.joinSelectTitle);

    //view.invalidate();

    this.view = view;       
    return view;
}

此方法：getCurrentRequestSelectedTables（）。size（）;将根据最终用户的互动返回不同大小的结果。

视图现在只显示其标题。所以我在想，为这个视图创建一个全新的活动，然后用我当前活动的意图调用它是否更好？或者有一种方法可以动态创建视图（如何从活动传递上下文然后实例化它？）并以编程方式向其添加微调器。

谢谢。 [编辑]：注意：还必须以编程方式添加在DialogFragment中创建的线性布局。 XML：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/joinSelectMod"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:orientation="vertical" >

</LinearLayout>

Answer 1

将onCreateView更改为：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
    Bundle savedInstanceState) {

View view = inflater.inflate(R.layout.fragment_layout_id, container);

LinearLayout viewLayout = (LinearLayout) view.findViewById(R.layout.fragment_edit_name);

 LinearLayout.LayoutParams llp = new LinearLayout.LayoutParams(
        LinearLayout.LayoutParams.WRAP_CONTENT,
        LinearLayout.LayoutParams.WRAP_CONTENT);

DBUtils dbManager = DBUtils.get();

ArrayList<Shape> dbManagerCurrentlySelectedTables = dbManager.getCurrentRequestSelectedTables();

ArrayList<String> allAvailableTables = new ArrayList<String>();

//get the names of all table elements
for(int k =0; k < dbManager.getCurrentRequestSelectedTables().size(); k++){
    allAvailableTables.add(dbManager.getCurrentRequestSelectedTables().get(k).getDbElement().getElementName());
}

for(int i = 0; i < dbManager.getCurrentRequestSelectedTables().size(); i++){
    if(i % 2 == 0){
        LinearLayout horizontalLayoutForTables = new LinearLayout(view.getContext()),
             horizontalLayoutForCols = new LinearLayout(view.getContext());

//set layout to be horizontal
        horizontalLayoutForTables.setOrientantion(LinearLayout.HORIZONTAL);
        horizontalLayoutForCols.setOrientantion(LinearLayout.HORIZONTAL);

        viewLayout.addView(horizontalLayoutForTables);
        viewLayout.addView(horizontalLayoutForCols);

        pairCount = 0;
    }
    //create a new spinner containing all the tables
    Spinner tableSpinner = new Spinner(view.getContext());
    tableSpinner.setAdapter(new SelectionDialogSpinnerAdapter(allAvailableTables));

    //create a corresponding spinner for the columns of the current table only.
    Spinner tableColumnSpinner = new Spinner(view.getContext());
    ArrayList<String> columnNamesOnly = new ArrayList<String>();//get the column names only for the spinner
    for(int j = 0; j < dbManagerCurrentlySelectedTables.get(i).getDbElement().getColumns().size(); j++){
        columnNamesOnly.add(dbManagerCurrentlySelectedTables.get(i).getDbElement().getColumns().get(j).getColumnName());
    }
    tableColumnSpinner.setAdapter(new SelectionDialogSpinnerAdapter(columnNamesOnly));

    //add to layout
    horizontalLayoutForTables.addView(tableSpinner, llp);
    horizontalLayoutForCols.addView(tableColumnSpinner, llp);


}


getDialog().setTitle(R.string.joinSelectTitle);

return view;

}

更新：包含用于在放入新的LinearLayout

时设置视图参数的代码

Android - 如何以编程方式添加和填充微调器？

1 个答案: