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我有一个带有列表视图的活动。单击列表视图中的项目时,会将意图发送到包含单击项目的值的下一个列表。该列表是使用 xml 文件生成的。

public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    // Selected item
    String cat  = ((TextView) view).getText().toString();

    // Launching new Activity on selecting single Item List
    Intent intent   = new Intent(getApplicationContext(), ContentListing.class);

    // Sending data to new activity
    intent.putExtra("cat", cat);
    startActivity(intent);
}

在下一个活动中,我再次必须读取一个 xml 文件,但该文件将根据在上一个列表中单击的项目而有所不同。

// Creating a handle to capture data sent from previous activity
Intent intent = getIntent();

// Storing the category into a variable
String cat = intent.getStringExtra("cat");

// Storing string resources into Array
String[] itemList   = getResources().getStringArray(R.array.itemList);

我想做一些像String[] itemList = getResources().getStringArray(R.array.cat);ie R.array.variable这样对我不起作用的事情。我是 java 和 android 的新手,所以欢迎任何形式的帮助(易于理解和实施)。

另外,我希望第二个活动的名称每次都与单击的项目不同。我应该为此做些什么?

编辑:

这是我更新的代码,它给出了关于 getContext() 的错误

    public class ContentListing extends ListActivity {

    @SuppressLint("NewApi")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_content_listing);

        // Make sure we're running on Honeycomb or higher to use ActionBar APIs
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            // Show the Up button in the action bar.
            getActionBar().setDisplayHomeAsUpEnabled(true); 
        }

        // Creating a handle to capture data sent from previous activity
        Intent intent = getIntent();

        // Storing the category into a variable
        String cat = intent.getStringExtra("cat");

        setTitle(cat);

        // Line that shows error
        int resourceId = Resources.getSystem().getIdentifier(cat, "array", getContext().getPackageName());

        Log.d("Print message1: ", String.valueOf(resourceId)+"\n");
        if(resourceId != 0) {
            Log.d("Print message: ", String.valueOf(resourceId)+"\n");

            // Storing string resources into Array
            //String[] itemList = getResources().getStringArray(R.array.itemList);
            String[] itemList   = getResources().getStringArray(resourceId);

            // Binding resources Array to ListAdapter
            this.setListAdapter(new ArrayAdapter<String>(this, R.layout.list_item2, R.id.label, itemList));

            ListView lv = getListView();

            // Listening to single list item on click
            lv.setOnItemClickListener(new OnItemClickListener() {
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                    // Selected item
                    String product  = ((TextView) view).getText().toString();

                    // Launching new Activity on selecting single Item List
                    Intent intent   = new Intent(getApplicationContext(), ContentListing.class);

                    // Sending data to new activity
                    intent.putExtra("product", product);
                    startActivity(intent);
                }
            });
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_content_listing, menu);
        return true;
    }

}
4

1 回答 1

1

您可以使用变量从资源中加载数组,如下所示:

int resourceId=Resources.getSystem().getIdentifier(cat, "array", getContext().getPackageName());
if(resourceId != 0){
  getResources().getStringArray(resourceId);
}

要设置活动的标题,

setTitle(cat);

不过,我会考虑检查您传入的额外值,然后使用 if else 语句加载资源。您可以更好地保证事情会正常工作。

int resId = R.array.defaultValue;
if(cat.equals("category1"){
  resId = R.array.categoryOneValues;
} else if(cat.equals("category2"){
  resId = R.array.categoryTwoValues;
}
getResources().getStringArray(resId);
于 2013-02-06T19:06:58.903 回答