所以我在Stackoverflow上尝试了很多解决方案,但我永远无法弄清楚如何做到这一点。我有点像新手。所以我有一个ListView,想要更改字体。 这是我的Java类,包含我的ListView
package qax.khabaralyoum;
import java.io.BufferedReader;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import android.annotation.TargetApi;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.Intent;
import android.graphics.drawable.ColorDrawable;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.text.Html;
import android.util.Log;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.view.View;
import android.view.Window;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
import uk.co.senab.actionbarpulltorefresh.library.ActionBarPullToRefresh;
import uk.co.senab.actionbarpulltorefresh.library.PullToRefreshLayout;
import uk.co.senab.actionbarpulltorefresh.library.listeners.OnRefreshListener;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Fragment;
import android.app.ListFragment;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
public class MainListActivity extends ListActivity {
public static final int NUMBER_OF_POSTS = 20;
public static final String TAG = MainListActivity.class.getSimpleName();
protected JSONObject mBlogData;
protected ProgressBar mProgressBar;
private final String KEY_TITLE = "title";
private final String KEY_AUTHOR = "author";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
getActionBar().hide();
setContentView(R.layout.activity_main_list);
mProgressBar = (ProgressBar) findViewById(R.id.progressBar);
if (isNetworkAvailable()) {
mProgressBar.setVisibility(View.VISIBLE);
GetBlogPostsTask getBlogPostsTask = new GetBlogPostsTask();
getBlogPostsTask.execute();
} else {
Toast.makeText(this, "Network is unavailable!", Toast.LENGTH_LONG).show();
}
//Toast.makeText(this, getString(R.string.no_items), Toast.LENGTH_LONG).show();
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
try {
JSONArray jsonPosts = mBlogData.getJSONArray("posts");
JSONObject jsonPost = jsonPosts.getJSONObject(position);
String blogUrl = jsonPost.getString("url");
Intent intent
= new Intent(this, BlogWebViewActivity.class);
intent.setData(Uri.parse(blogUrl));
startActivity(intent);
} catch (JSONException e) {
logException(e);
}
}
private void logException(Exception e) {
logException(e);
}
private boolean isNetworkAvailable() {
ConnectivityManager manager = (ConnectivityManager)
getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = manager.getActiveNetworkInfo();
boolean isAvailable = false;
if (networkInfo != null && networkInfo.isConnected()) {
isAvailable = true;
}
return isAvailable;
}
private void handleBlogResponse() {
mProgressBar.setVisibility(View.INVISIBLE);
if (mBlogData == null) {
updateDisplayError();
} else {
try {
JSONArray jsonPosts = mBlogData.getJSONArray("posts");
ArrayList<HashMap<String, String>> blogPosts =
new ArrayList<HashMap<String, String>>();
for (int i = 0; i < jsonPosts.length(); i++) {
JSONObject post = jsonPosts.getJSONObject(i);
String title = post.getString(KEY_TITLE);
title = Html.fromHtml(title).toString();
HashMap<String, String> blogPost = new HashMap<String, String>();
blogPost.put(KEY_TITLE, title);
blogPosts.add(blogPost);
}
String[] keys = {KEY_TITLE};
int[] ids = {android.R.id.text1};
SimpleAdapter adapter = new SimpleAdapter(this, blogPosts, android.R.layout.simple_list_item_1, keys, ids);
setListAdapter(adapter);
} catch (JSONException e) {
logException(e);
}
}
}
private void updateDisplayError() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle(getString(R.string.error_title));
builder.setMessage(getString(R.string.error_message));
builder.setPositiveButton(android.R.string.ok, null);
AlertDialog dialog = builder.create();
dialog.show();
TextView emptyTextView = (TextView) getListView().getEmptyView();
emptyTextView.setText(getString(R.string.no_items));
}
private class GetBlogPostsTask extends AsyncTask<Object, Void, JSONObject> {
@Override
protected JSONObject doInBackground(Object... params) {
int responseCode = -1;
JSONObject jsonResponse = null;
StringBuilder builder = new StringBuilder();
HttpClient client = new DefaultHttpClient();
HttpGet httpget = new HttpGet("http://idoodling.com/api/get_recent_posts/");
try {
HttpResponse response = client.execute(httpget);
StatusLine statusLine = response.getStatusLine();
responseCode = statusLine.getStatusCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
HttpEntity entity = response.getEntity();
InputStream content = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(content));
String line;
while ((line = reader.readLine()) != null) {
builder.append(line);
}
jsonResponse = new JSONObject(builder.toString());
} else {
Log.i(TAG, String.format("Unsuccessful HTTP response code: %d", responseCode));
}
} catch (MalformedURLException e) {
logException(e);
} catch (IOException e) {
logException(e);
} catch (Exception e) {
logException(e);
}
return jsonResponse;
}
@Override
protected void onPostExecute(JSONObject result) {
mBlogData = result;
handleBlogResponse();
}
}
public void activity2(View view) {
Intent intent = new Intent(this, qax.khabaralyoum.BlogWebViewActivity.class);
startActivity(intent);
}
}
我从解决方案中知道我需要某种类型的适配器来更改字体。我想我的Class中有一个Adapater,但我是否需要编辑或添加一些内容,以便我可以将它连接到XML以更改字体颜色?对于我所拥有的代码,我会喜欢一步一步的指导。
答案 0 :(得分:3)
正如您在帖子中提到的,您需要在适配器中设置字体颜色。为此,您需要覆盖默认的getView
并进行更改,以便为TextView设置文本的颜色。为此,请更改
SimpleAdapter adapter = new SimpleAdapter(this, blogPosts, android.R.layout.simple_list_item_1, keys, ids);
到
SimpleAdapter adapter = new SimpleAdapter(this, blogPosts, android.R.layout.simple_list_item_1, keys, ids){
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = super.getView(position, convertView, parent);
TextView tv = (TextView) view.findViewById(android.R.id.text1);
tv.setTextColor(Color.RED);
return view;
};
};
您需要将Color.RED
更改为您想要的颜色。如果您使用的是十六进制颜色代码,则可以执行Color.parseColor("#FFFFFF")
,用您的颜色替换#FFFFFF
。如果您需要有关获取Color对象的更多信息,请参阅有关Color的Android文档页面。 (该页面可在https://developer.android.com/reference/android/graphics/Color.html)