我有一个包含2个listviews和2个适配器的布局。第一个列表我只想显示来自Web服务调用的第一个人。第二个listview我想显示我在他们向那个人报告后得到的列表。当用户点击第二个列表时，我想用来自他们的参数进行网络呼叫。
如何更新第二个列表视图以使用param进行另一个调用以获取新列表并刷新该列表视图而不是转到另一个活动？我可以正确地提供Web服务，但我将进行一项新的活动。我想让listview更新为第二个listview的新数据和用户点击显示在列表视图上的人。
public class MainActivity extends AppCompatActivity {
ListView mMangerList, directReportListView;
ProgressBar mProgressBar;
ArrayList<PeepWithPic> mPeepWithPics = new ArrayList<>();
TopListViewAdapter mTopListViewAdapter;
BottomListViewAdapter mBottomListViewAdapter;
DatabaseHandler databaseHandler;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/* if toolbar is wanted by user uncomment
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);*/
mMangerList = (ListView) findViewById(R.id.mManagerList);
directReportListView = (ListView) findViewById(R.id.mDirectReportList);
mProgressBar = (ProgressBar) findViewById(R.id.progressBar);
mProgressBar.setVisibility(View.VISIBLE);
mTopListViewAdapter = new TopListViewAdapter(this, mPeepWithPics);
mBottomListViewAdapter = new BottomListViewAdapter(this, mPeepWithPics);
mMangerList.setAdapter(mTopListViewAdapter);
directReportListView.setAdapter(mBottomListViewAdapter);
getXMLData();
/*databaseHandler = new DatabaseHandler(getApplicationContext());
List<PeepWithPic> peepPic = databaseHandler.getAllContacts();
for (PeepWithPic pwc : peepPic) {
String log = "ID: " +pwc.getEmployee_number()+" ,First Name: " + pwc.getFirst_name() +
" ,Last Name: " + pwc.getLast_name() + " ,Title: " + pwc.getPayroll_title();
Log.d("PEEP ", log);
}*/
}
//Uncomment to add OptionsMenu(three dots on app bar) if needed
/*@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}*/
private static OkHttpClient getUnsafeOkHttpClient() {
try {
// Create a trust manager that does not validate certificate chains
final TrustManager[] trustAllCerts = new TrustManager[]{
new X509TrustManager() {
@Override
public void checkClientTrusted(java.security.cert.X509Certificate[] chain, String authType) throws CertificateException {
}
@Override
public void checkServerTrusted(java.security.cert.X509Certificate[] chain, String authType) throws CertificateException {
}
@Override
public java.security.cert.X509Certificate[] getAcceptedIssuers() {
return new java.security.cert.X509Certificate[]{};
}
}
};
// Install the all-trusting trust manager
final SSLContext sslContext = SSLContext.getInstance("SSL");
sslContext.init(null, trustAllCerts, new java.security.SecureRandom());
// Create an ssl socket factory with our all-trusting manager
final SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();
OkHttpClient.Builder builder = new OkHttpClient.Builder();
builder.connectTimeout(5, TimeUnit.MINUTES)
.writeTimeout(5, TimeUnit.MINUTES)
.readTimeout(5, TimeUnit.MINUTES);
builder.sslSocketFactory(sslSocketFactory);
builder.hostnameVerifier(new HostnameVerifier() {
@Override
public boolean verify(String hostname, SSLSession session) {
return true;
}
});
return builder.build();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public void getXMLData() {
OkHttpClient client = getUnsafeOkHttpClient();
Request request = new Request.Builder()
.url(getString(R.string.API_FULL_URL))
.build();
client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
e.printStackTrace();
}
@Override
public void onResponse(Call call, final Response response) throws IOException {
final String responseData = response.body().string();
final InputStream stream = new ByteArrayInputStream(responseData.getBytes());
XMLPullParserHandler parserHandler = new XMLPullParserHandler();
final ArrayList<PeepWithPic> peepWithPics = (ArrayList<PeepWithPic>) parserHandler.parse(stream);
mPeepWithPics.clear();
mPeepWithPics.addAll(peepWithPics);
ContentValues contentValues = new ContentValues();
//tell adapter on the UI thread its data changed
runOnUiThread(new Runnable() {
@Override
public void run() {
mTopListViewAdapter.notifyDataSetChanged();
mBottomListViewAdapter.notifyDataSetChanged();
mMangerList.setVisibility(View.VISIBLE);
directReportListView.setVisibility(View.VISIBLE);
mProgressBar.setVisibility(View.GONE);
}
});
}
});
}
}
public class TopListViewAdapter extends ArrayAdapter<PeepWithPic> {
public TopListViewAdapter(Context context, ArrayList<PeepWithPic> peepWithPic) {
super(context, 0, peepWithPic);
}
@NonNull
@Override
public View getView(final int position, View convertView, @NonNull final ViewGroup parent) {
final PeepWithPic peepWithPic = getItem(position);
final AppViewHolder holder;
convertView = LayoutInflater.from(getContext()).inflate(R.layout.contact_cardview_layout, parent, false);
holder = new AppViewHolder();
holder.tvFirstName = (TextView) convertView.findViewById(R.id.personFirstName);
holder.tvLastName = (TextView) convertView.findViewById(R.id.personLastName);
holder.tvTitle = (TextView) convertView.findViewById(R.id.personTitle);
holder.mPeepPic = (ImageView) convertView.findViewById(R.id.person_photo);
holder.mDetailsButton = (ImageButton) convertView.findViewById(R.id.fullDetailButton);
holder.mCardView = (CardView) convertView.findViewById(R.id.home_screen_cardView);
if (peepWithPic != null) {
holder.tvFirstName.setText(peepWithPic.getFirst_name());
holder.tvLastName.setText(peepWithPic.getLast_name());
holder.tvTitle.setText(peepWithPic.getPayroll_title());
if (peepWithPic.getThumbnailData() != null) {
String peepPicData = peepWithPic.getThumbnailData();
byte[] imageAsBytes = Base64.decode(peepPicData.getBytes(), Base64.DEFAULT);
Bitmap parsedImage = BitmapFactory.decodeByteArray(imageAsBytes, 0, imageAsBytes.length);
holder.mPeepPic.setImageBitmap(parsedImage);
}
holder.mDetailsButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(getContext(),"This is working as expect for now", Toast.LENGTH_LONG).show();
}
});
holder.mCardView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String peepWithPic1 = peepWithPic.getEmployee_number();
Intent mIntent = new Intent(view.getContext(), MainActivity.class);
mIntent.putExtra("Employee_number", peepWithPic1);
mIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
view.getContext().startActivity(mIntent);
}
});
convertView.setTag(holder);
}
return convertView;
}
public class AppViewHolder {
private TextView tvFirstName;
private TextView tvLastName;
private TextView tvTitle;
private ImageView mPeepPic;
private ImageButton mDetailsButton;
private CardView mCardView;
}
另一个适配器是相同的，因为我不知道如何让bottomListView更新listview只显示新数据而不去另一个活动。
我知道mIntent转到MainAcitivy.class并不是我想要的TopListViewAdapter，但我不知道如何让解析后的第一个人在该视图中显示。
答案 0 :(得分：0)
ArrayLists不是线程安全的，因此不应在主线程之外修改active。也可以将修改代码放在mPeepWithPics中，或者更好的是，使用ArrayAdapter（ArrayAdapter.clear()和ArrayAdapter.addAll()）的相应方法。