我有一个列表视图的活动。在单击列表视图的项目时,会将意图发送到包含所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,我再次必须阅读xml文件,但此文件将根据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 String[] itemList = getResources().getStringArray(R.array.cat);
之类的事情,即 R.array.variable ,这对我不起作用。我是java和android的新手,所以欢迎任何形式的帮助(易于理解和实现)。
另外,我希望每次关于单击的项目,第二个活动的名称都不同。我应该为此做些什么?
修改
这是我更新的代码,它提供了有关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;
}
}
答案 0 :(得分:1)
您可以使用变量从以下资源加载数组:
int resourceId=Resources.getSystem().getIdentifier(cat, "array", getContext().getPackageName());
if(resourceId != 0){
getResources().getStringArray(resourceId);
}
设置活动的标题,
setTitle(cat);
但我会考虑,检查传入的额外值,然后使用if else语句加载资源。你可以更好地保证事情能够正常运作。
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);