我是安卓新手。我的问题是当我尝试单击主类（Trip_planning_list）中的按钮时，我需要在我的子类（EventListAdapter）中启用一个图像视图，然后我收到以下 logcat 错误和我的代码。
谢谢，赛姆。
05-23 18:12:37.292: I/value of imagerotation(606): [mmm]
05-23 18:12:39.052: D/AndroidRuntime(606): Shutting down VM
05-23 18:12:39.052: W/dalvikvm(606): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
05-23 18:12:39.082: E/AndroidRuntime(606): FATAL EXCEPTION: main
05-23 18:12:39.082: E/AndroidRuntime(606): java.lang.NullPointerException
05-23 18:12:39.082: E/AndroidRuntime(606): at com.igfa.Trip_planning_list$3.onClick(Trip_planning_list.java:106)
05-23 18:12:39.082: E/AndroidRuntime(606): at android.view.View.performClick(View.java:2408)
05-23 18:12:39.082: E/AndroidRuntime(606): at android.view.View$PerformClick.run(View.java:8816)
05-23 18:12:39.082: E/AndroidRuntime(606): at android.os.Handler.handleCallback(Handler.java:587)
05-23 18:12:39.082: E/AndroidRuntime(606): at android.os.Handler.dispatchMessage(Handler.java:92)
05-23 18:12:39.082: E/AndroidRuntime(606): at android.os.Looper.loop(Looper.java:123)
05-23 18:12:39.082: E/AndroidRuntime(606): at android.app.ActivityThread.main(ActivityThread.java:4627)
05-23 18:12:39.082: E/AndroidRuntime(606): at java.lang.reflect.Method.invokeNative(Native Method)
05-23 18:12:39.082: E/AndroidRuntime(606): at java.lang.reflect.Method.invoke(Method.java:521)
05-23 18:12:39.082: E/AndroidRuntime(606): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
05-23 18:12:39.082: E/AndroidRuntime(606): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
05-23 18:12:39.082: E/AndroidRuntime(606): at dalvik.system.NativeStart.main(Native Method)
package com.igfa;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Dialog;
import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.SQLException;
import android.net.Uri;
import android.opengl.Visibility;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.igfa.database.DBAdapter;
public class Trip_planning_list extends ListActivity {
ImageView facebookimage,donateimage,getthemobileapp;
Timer timer;
TimerTask task;
ImageView slidingimage,deleteCrossButton,deleteBigButton;
int value1=0;
public int currentimageindex=0;
boolean f1=false;
private int[] IMAGE_IDS = {
R.drawable.facebook,
R.drawable.donateimage,
R.drawable.getthemobileapp
};
TextView name,address,dob,dep,mstatus;
ListView lv;
DBAdapter db;
/** Called when the activity is first created. */
Button cancel,ok;
TextView addView,add_list;
ImageButton backButton,EditButton;
EditText edit;
Cursor state_value;
RelativeLayout _tmplinear;
ArrayList<String>value=new ArrayList<String>();
int i=1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.tripplanninglist);
db= new DBAdapter(getApplicationContext());
db.open();
facebookimage=(ImageView)findViewById(R.id.facebook);
final Handler mHandler = new Handler();
// Create runnable for posting
final Runnable mUpdateResults = new Runnable() {
public void run() {
AnimateandSlideShow();
}
};
int delay = 1000; // delay for 1 sec.
int period = 8000; // repeat every 4 sec.
Timer timer = new Timer();
timer.scheduleAtFixedRate(new TimerTask() {
public void run() {
mHandler.post(mUpdateResults);
}
}, delay, period);
addView =(TextView)findViewById(R.id.Add);
backButton = (ImageButton)findViewById(R.id.ig);
EditButton = (ImageButton)findViewById(R.id.edit_button);
EditButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
deleteCrossButton.setVisibility(View.VISIBLE);
}
});
backButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent backIntent = new Intent(Trip_planning_list.this,Igfamobile1Activity.class);
startActivity(backIntent);
}
});
try {
state_value= db.getState();
if ( state_value.moveToFirst())
{
do {
value.add(state_value.getString(1));
}
while (state_value.moveToNext());
}
} catch (SQLException e) {
// TODO Auto-g
}
Collections.sort(value);
lv = (ListView) findViewById(R.id.list);
lv=getListView();
lv.setAdapter(new StateListAdapter(this));
lv.setFastScrollEnabled(true);
ListAdapter listAdapter = lv.getAdapter();
if (listAdapter == null) {
// pre-condition
return;
}
int totalHeight = 0;
for (int i = 0; i < listAdapter.getCount(); i++) {
View listItem = listAdapter.getView(i, null, lv);
//listItem.measure(0, 0);
totalHeight += listItem.getMeasuredHeight();
}
ViewGroup.LayoutParams params = lv.getLayoutParams();
params.height = totalHeight
+ (lv.getDividerHeight() * (listAdapter.getCount() - 1));
lv.setLayoutParams(params);
lv.requestLayout();
addView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
final Dialog dialog = new Dialog(Trip_planning_list.this);
dialog.setContentView(R.layout.custom1);
dialog.setCancelable(true);
cancel=(Button)dialog.findViewById(R.id.Cancle_c);
ok=(Button)dialog.findViewById(R.id.OK_c);
edit=(EditText)dialog.findViewById(R.id.edit_c);
ok.setOnClickListener(new OnClickListener() {
int i=0;
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
//value.clear();
ok.setBackgroundResource(R.drawable.ok);
cancel.setBackgroundResource(R.drawable.cancel_hover);
value.add(edit.getText().toString().trim());
db.insertStateName(edit.getText().toString().trim());
Log.i("value of addtrip",value.get(i));
i++;
edit.setText("");
Collections.sort(value);
lv=getListView();
lv.setAdapter(new EventListAdapter(this));
lv.setFastScrollEnabled(true);
dialog.dismiss();
}
});
cancel.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
ok.setBackgroundResource(R.drawable.ok_hover);
cancel.setBackgroundResource(R.drawable.cancel1);
// TODO Auto-generated method stub
dialog.dismiss();
}
});
dialog.show();
}
});
}
public void onClick(View v) {
finish();
android.os.Process.killProcess(android.os.Process.myPid());
}
private void AnimateandSlideShow() {
slidingimage = (ImageView)findViewById(R.id.facebook);
slidingimage.setImageResource(IMAGE_IDS[currentimageindex%IMAGE_IDS.length]);
currentimageindex++;
value1=currentimageindex;
facebookimage.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(value1%3==1)
{
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse("http://www.facebook.com/pages/International-Game-Fish-Association/103760506329326"));
startActivity(i);
}
else if(value1%3==2)
{
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse("http://www.igfa.org/Donate/DonorSocieties.aspx"));
startActivity(i);
}else
{
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse("http://www.igfa.org/Fish/IGFA-Mobile.aspx"));
startActivity(i);
}
}
});
Log.v("---==================", ""+currentimageindex);
Log.i("value of imagerotation",String.valueOf(value));
//Animation rotateimage = AnimationUtils.loadAnimation(this, R.anim.custom_anim);
//slidingimage.startAnimation(rotateimage);
}
/*
* Adapter for populating data in list
*/
private class EventListAdapter extends BaseAdapter {
private OnClickListener mContext;
public EventListAdapter(OnClickListener onClickListener) {
mContext = onClickListener;
}
public int getCount() {
return value.size();
}
public Object getItem(int position1) {
return position1;
}
public long getItemId(int position1) {
return position1;
}
public View getView(final int position1, View convertView, ViewGroup parent) {
View v;
LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.trip_list, null);
deleteCrossButton = (ImageView)findViewById(R.id.delete_cross_icon);
deleteBigButton = (ImageView)findViewById(R.id.deleteBtn);
add_list=(TextView)v.findViewById(R.id.Add_trip);
add_list.setText(value.get(position1));
_tmplinear=(RelativeLayout)v.findViewById(R.id.linear_trip);
deleteCrossButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
deleteBigButton.setVisibility(View.VISIBLE);
}
});
_tmplinear.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent in=new Intent(getApplicationContext(),TripPlaning_SubList.class);
in.putExtra("select", value.get(position1));
startActivity(in);
}
});
return v;
}
};
/*
* Adapter for populating data in list
*/
private class StateListAdapter extends BaseAdapter {
private Trip_planning_list mContext;
public StateListAdapter(Trip_planning_list tripPlanningList) {
mContext = tripPlanningList;
}
public int getCount() {
return value.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
View v;
LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.trip_list, null);
add_list=(TextView)v.findViewById(R.id.Add_trip);
add_list.setText(value.get(position));
_tmplinear=(RelativeLayout)v.findViewById(R.id.linear_trip);
_tmplinear.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent in=new Intent(getApplicationContext(),TripPlaning_SubList.class);
in.putExtra("select", value.get(position));
startActivity(in);
}
});
return v;
}
};
}