所以我试图在按下一个按钮时显示一个对话框，该按钮出现在我的Custom ListView的每一行中。
我的列表适配器代码如下：
public class HomeTimelineAdapter extends ArrayAdapter<Status> {
private LayoutInflater inflater;
private int tvrId;
private List<Status> listItems;
Dialog dialog;
Status item;
public HomeTimelineAdapter(Context context, int textViewResourceId, List<Status> objects) {
super(context, textViewResourceId, objects);
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
tvrId = textViewResourceId;
listItems = objects;
dialog=new Dialog(context); //This Line is giving an error how do I give context here.
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
try {
ViewHolder holder;
item = listItems.get(position);
if (convertView == null) {
convertView = inflater.inflate(tvrId, null);
holder = new ViewHolder();
holder.text = (TextView) convertView.findViewById(R.id.user_text);
holder.add_journey = (Button) convertView.findViewById(R.id.journey);
holder.add_journey.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
showdialog();
}
});
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.text.setText(item.getUser().getScreenName() + " : " + item.getText());
} catch (Exception e) {
e.printStackTrace();
}
return convertView;
}
private static class ViewHolder {
public TextView text;
public Button add_journey;
}
void showdialog() {
dialog.setTitle("Journey");
dialog.setContentView(R.layout.dialog);
TextView text=(TextView) dialog.findViewById(R.id.textView);
final EditText tag_name=(EditText) dialog.findViewById(R.id.editText);
Button done =(Button) dialog.findViewById(R.id.button);
text.setText("Journey Tag");
done.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
DBItem items=new DBItem(tag_name.getText().toString(),item.getId());
items.save();
}
});
dialog.show();
}
}
我的活动类的代码：
public class AndroidTwitterGoogleApiJavaClientActivity extends Activity {
private SharedPreferences prefs;
private TextView textView;
private HomeTimelineAdapter adapter;
private ListView listview;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
listview = (ListView) findViewById(R.id.listview);
this.prefs = PreferenceManager.getDefaultSharedPreferences(this);
Button launchOauth = (Button) findViewById(R.id.btn_launch_oauth);
Button clearCredentials = (Button) findViewById(R.id.btn_clear_credentials);
textView = (TextView) findViewById(R.id.response_code);
launchOauth.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(new Intent().setClass(v.getContext(),OAuthAccessTokenActivity.class));
}
});
clearCredentials.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
clearCredentials();
performApiCall();
}
});
performApiCall();
}
private void clearCredentials() {
new SharedPreferencesCredentialStore(prefs).clearCredentials();
}
/**
* Performs an authorized API call.
*/
private void performApiCall() {
new ApiCallExecutor().execute();
}
private class ApiCallExecutor extends AsyncTask<Uri, Void, Void> {
@Override
protected Void doInBackground(Uri...params) {
try {
// String tweet = "Tweet sent at " + new Date();
// TwitterUtils.sendTweet(prefs, tweet);
ResponseList<twitter4j.Status> userTimeline = TwitterUtils.getUserTimeline(prefs);
List<twitter4j.Status> statusList = new ArrayList<twitter4j.Status>();
for (twitter4j.Status status : userTimeline) {
statusList.add(status);
}
adapter = new HomeTimelineAdapter(AndroidTwitterGoogleApiJavaClientActivity.this,R.layout.tweet_row,statusList);
} catch (Exception ex) {
adapter = new HomeTimelineAdapter(AndroidTwitterGoogleApiJavaClientActivity.this,R.layout.tweet_row,new ArrayList<twitter4j.Status>());
ex.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
listview.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
}
}
我的Logcat：
12-17 22:41:14.926 5439-5453/com.ecs.sample E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
Process: com.ecs.sample, PID: 5439
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:864)
Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
at android.os.Handler.<init>(Handler.java:200)
at android.os.Handler.<init>(Handler.java:114)
at android.app.Dialog.<init>(Dialog.java:114)
at android.app.Dialog.<init>(Dialog.java:138)
at com.ecs.sample.HomeTimelineAdapter.<init>(HomeTimelineAdapter.java:31)
at com.ecs.sample.AndroidTwitterGoogleApiJavaClientActivity$ApiCallExecutor.doInBackground(AndroidTwitterGoogleApiJavaClientActivity.java:87)
at com.ecs.sample.AndroidTwitterGoogleApiJavaClientActivity$ApiCallExecutor.doInBackground(AndroidTwitterGoogleApiJavaClientActivity.java:70)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:864)
12-17 22:41:15.616 5439-6612/com.ecs.sample W/dalvikvm﹕ threadid=18: thread exiting with uncaught exception (group=0x41623e18)
12-17 22:41:15.626 5439-6612/com.ecs.sample E/AndroidRuntime_2_crash﹕ crash in the same process: AsyncTask #2
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:864)
Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
at android.os.Handler.<init>(Handler.java:200)
at android.os.Handler.<init>(Handler.java:114)
at android.app.Dialog.<init>(Dialog.java:114)
at android.app.Dialog.<init>(Dialog.java:138)
at com.ecs.sample.HomeTimelineAdapter.<init>(HomeTimelineAdapter.java:31)
at com.ecs.sample.AndroidTwitterGoogleApiJavaClientActivity$ApiCallExecutor.doInBackground(AndroidTwitterGoogleApiJavaClientActivity.java:87)
at com.ecs.sample.AndroidTwitterGoogleApiJavaClientActivity$ApiCallExecutor.doInBackground(AndroidTwitterGoogleApiJavaClientActivity.java:70)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:864)
12-17 22:41:15.666 5439-6625/com.ecs.sample D/libc﹕ [NET] getaddrinfo+,hn 15(0x6170692e747769),sn(),family 0,flags 4
12-17 22:41:15.666 5439-6625/com.ecs.sample D/libc﹕ [NET] getaddrinfo-,err=8
12-17 22:41:15.666 5439-6625/com.ecs.sample D/libc﹕ [NET] getaddrinfo+,hn 15(0x6170692e747769),sn(),family 0,flags 1024
12-17 22:41:15.666 5439-6625/com.ecs.sample D/libc﹕ [NET] getaddrinfo-, 1
12-17 22:41:15.666 5439-6625/com.ecs.sample D/libc﹕ [NET] getaddrinfo_proxy+
12-17 22:41:15.686 5439-6625/com.ecs.sample D/libc﹕ [NET] getaddrinfo_proxy-, success
12-17 22:41:15.686 5439-6625/com.ecs.sample I/global﹕ call createSocket() return a new socket.
12-17 22:41:15.686 5439-6625/com.ecs.sample D/libc﹕ [NET] getaddrinfo+,hn 13(0x3139392e35392e),sn(),family 0,flags 4
12-17 22:41:15.686 5439-6625/com.ecs.sample D/libc﹕ [NET] getaddrinfo-, SUCCESS
12-17 22:41:17.486 5439-5453/com.ecs.sample D/Process﹕ killProcess, pid=5439
行对话框=新对话框（上下文）;正在使我的整个应用程序崩溃，因为列表视图无法加载。如果我评论列表显示的整行，但按下按钮应用程序崩溃，因为对话框没有上下文。如何在listadapter类中提供应用程序上下文？已经尝试过this.getapplicationcontext（），任何建议都会有所帮助。
由于
答案 0 :(得分：0)
How do I give application context inside the listadapter class ? Have already tried this.getapplicationcontext()您需要Activity-Context来显示对话框。不是Application-Context ..这两个是不同的！只需将YourActivityClassName.this传递给您的对话框即可！然后会出现对话框！