所以我尝试读入一个CSV
文件,并在ListView
中显示它。我已经在raw目录中获得了csv文件,并且我已经成功地读取了每一行,并将其输出到日志中。下一步是获取数据并将其显示在ListView
中。我的数据存储在ArrayList
中,所以我尝试使用ArrayAdapater
,但出现了问题标题中显示的错误。
MainActvity.java:
private final List<Sample> coordArray = new ArrayList<>();
private void readGPSData() {
// Read the raw csv file
InputStream is = getResources().openRawResource(R.raw.rawgps);
// Reads text from character-input stream, buffering characters for efficient reading
BufferedReader reader = new BufferedReader(
new InputStreamReader(is, Charset.forName("UTF-8"))
);
// Initialization
String line = "";
// Initialization
try {
// Step over headers
reader.readLine();
// If buffer is not empty
while ((line = reader.readLine()) != null) {
Log.d("MyActivity","Line: " + line);
// use comma as separator columns of CSV
String[] tokens = line.split(",");
// Read the data
Sample sample = new Sample();
// Setters
sample.setLat(tokens[0]);
sample.setLon(tokens[1]);
// Adding object to a class
coordArray.add(sample);
final ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1, coordArray);
listView.setAdapter(adapter);
// Log the object
Log.d("My Activity", "Just created: " + sample);
}
} catch (IOException e) {
// Logs error with priority level
Log.wtf("MyActivity", "Error reading data file on line" + line, e);
// Prints throwable details
e.printStackTrace();
}
}
我已经使用ArrayAdapter
很多次了,从来没有遇到过这个问题。如有任何帮助,我们不胜感激!
发布于 2018-09-18 03:55:06
你的代码的问题是:
private final List<Sample> coordArray = new ArrayList<>();
是Sample
类型,而ArrayAdapter
是"String“类型。
ArrayAdapter
期望与List
具有相同的类型,然后将其放入构造函数中,解决方案是具有相同的类型,例如:
List<Sample> coordArray = new ArrayList<Sample>();
ArrayAdapter<Sample> adapter = new ArrayAdapter<Sample>(getApplicationContext(), android.R.layout.simple_list_item_1, coordArray);
发布于 2018-09-18 03:46:12
尝试使用getActivity()
而不是getApplicationContext(
)。
https://stackoverflow.com/questions/52374175
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