从选定的微调项字符串准备资源 ID

Question

我有一个带有各种项目的微调器，我用它来从所选项目中获取文本。

我想使用此文本为 openRawResource 准备一个资源 ID，我的代码看起来像

    Spinner spinner = (Spinner) v.findViewById(R.id.accident);
    String text = spinner.getSelectedItem().toString();
    String newt = "R.raw." + text;
    int textxx = Integer.parseInt(newt); 

    InputStream is = getResources().openRawResource(textxx);

但是不行，有什么想法

Answer 1

试试这个将此添加到 strings.xml:

  <string-array name="raw_resources">
        <item>@raw/yourresource1</item>
        <item>@raw/yourresource2</item>
        <item>@raw/yourresource3</item>
        <item>@raw/yourresource4</item>
        <item>@raw/yourresource5</item>
    </string-array>

现在在你的片段中像这样访问它：

final TypedArray resourceIDS = res.obtainTypedArray(R.array.select_sounds);
        int[] resIds = new int[sounds.length()];
        for (int i = 0; i < sounds.length(); i++) {
            resIds[i] = sounds.getResourceId(i, -1);
        }
resourceIDS.recycle();

现在您在 resIds 数组中拥有原始文件 ID 的所有 ID。只需根据在微调器中选择的项目对其进行索引即可。

Answer 2

第一个想法是使用 HashMap 来查找所需值的 ResID。但是，这有一个问题，即 'String' 需要是唯一的，否则您可能会遇到一些非常糟糕的行为（当您填充哈希图时，条目会相互覆盖）

但是 Resources has a method 会为您执行此查找

/*
Return a resource identifier for the given resource name. 
A fully qualified resource name is of the form "package:type/entry". The
first two components (package and type) are optional if defType and
defPackage, respectively, are specified here.

Note: use of this function is discouraged. It is much more efficient to
retrieve resources by identifier than by name.
*/
public int getIdentifier (String name, String defType, String defPackage)

所以试试这个：

Spinner spinner = (Spinner) v.findViewById(R.id.accident);
String resName = spinner.getSelectedItem().toString();

int resID= this.getResources().getIdentifier(
             resName, "raw", this.getPackageName());

InputStream is = getResources().openRawResource(resID);

Answer 3

问题就在这里

int textxx = Integer.parseInt(newt);

正确的做法是：

int resID = getResources().getIdentifier(text, "raw", getApplicationContext().getPackageName());

现在您可以按如下方式使用 InputStream :

InputStream is = getResources().openRawResource(resID);

编辑

does not allow getPackageName() says its indefined

如果你在 Activity 你可以做到 :

this.getPackageName(); //this -> context

如果你在 Fragment 你可以做到 :

getActivity().getPackageName();

but only opens the first item in the spinner does not open other files when i select other items

您需要实施 onItemSelected() 请参阅下面的代码。

final Spinner sp = (Spinner)findViewById(R.id.spinner);
    sp.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
            // your code here
            String text = sp.getSelectedItem().toString();
            int resID = getResources().getIdentifier(text, "raw", getPackageName());
            InputStream is = getResources().openRawResource(resID);
            Toast.makeText(MainActivity.this, "Clicked", Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onNothingSelected(AdapterView<?> parentView) {
            // your code here
        }

    });

从选定的微调项字符串准备资源 ID

prepare resource id from selected spinner item string

resources

android

spinner

编辑