I am not able to find the error android app is forcefully stopped. When I use the general sample data which is commented in this program it works fine but when i use this code it gets crashed.
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Locale;
import android.os.Bundle;
import android.app.Activity;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.Menu;
import android.widget.EditText;
import android.widget.ListView;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class MainActivity extends Activity {
// Declare Variables
ListView list;
ListViewAdapter adapter;
EditText editsearch;
String[] rank;
String[] country;
String[] population;
ArrayList<WorldPopulation> arraylist = new ArrayList<WorldPopulation>();
public String loadJSONFromAsset() {
String json = null;
try {
InputStream is = getAssets().open("data.json");
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
json = new String(buffer, "UTF-8");
} catch (IOException ex) {
ex.printStackTrace();
return null;
}
return json;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listview_main);
try {
JSONObject obj = new JSONObject(loadJSONFromAsset());
JSONArray m_jArry = obj.getJSONArray("maindata");
rank = new String[m_jArry.length()];
country = new String[m_jArry.length()];
population = new String[m_jArry.length()];
for (int i = 0; i < m_jArry.length(); i++) {
JSONObject jo_inside = m_jArry.getJSONObject(i);
rank[i] = jo_inside.getString("rank");
country[i] = jo_inside.getString("country");
population[i] = jo_inside.getString("population");
System.out.println(rank[i]);
}
}catch (JSONException e){
e.printStackTrace();
}
// Generate sample data
/*rank = new String[] { "1", "2", "3", "4", "5", "6", "7", "8", "9", "10" };
country = new String[] { "China", "India", "United States",
"Indonesia", "Brazil", "Pakistan", "Nigeria", "Bangladesh",
"Russia", "Japan" };
population = new String[] { "1,354,040,000", "1,210,193,422",
"315,761,000", "237,641,326", "193,946,886", "182,912,000",
"170,901,000", "152,518,015", "143,369,806", "127,360,000" };*/
// Locate the ListView in listview_main.xml
list = (ListView) findViewById(R.id.listview);
for (int i = 0; i < rank.length; i++)
{
WorldPopulation wp = new WorldPopulation(rank[i], country[i],
population[i]);
// Binds all strings into an array
arraylist.add(wp);
}
// Pass results to ListViewAdapter Class
adapter = new ListViewAdapter(this, arraylist);
// Binds the Adapter to the ListView
list.setAdapter(adapter);
// Locate the EditText in listview_main.xml
editsearch = (EditText) findViewById(R.id.search);
// Capture Text in EditText
editsearch.addTextChangedListener(new TextWatcher() {
@Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
String text = editsearch.getText().toString().toLowerCase(Locale.getDefault());
adapter.filter(text);
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1,
int arg2, int arg3) {
// TODO Auto-generated method stub
}
@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
});
}
}
Json file contains :
{
"maindata": [
{
"country": "rumbo",
"rank": "45",
"population": "45000"
},
{
"country": "reck",
"rank": "46",
"population": "4500"
}
]
}
01-13 06:22:27.024 2057-2057/? E/memtrack: Couldn't load memtrack module (No such file or directory)
01-13 06:22:27.024 2057-2057/? E/android.os.Debug: failed to load memtrack module: -2
01-13 06:22:27.045 2057-2070/? E/art: Thread attaching while runtime is shutting down: Binder_2
01-13 06:22:27.406 2073-2073/? E/memtrack: Couldn't load memtrack module (No such file or directory)
01-13 06:22:27.406 2073-2073/? E/android.os.Debug: failed to load memtrack module: -2
01-13 06:22:27.707 2086-2086/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.robosoft.elections, PID: 2086
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.robosoft.elections/com.robosoft.elections.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference
at org.json.JSONTokener.nextCleanInternal(JSONTokener.java:116)
at org.json.JSONTokener.nextValue(JSONTokener.java:94)
at org.json.JSONObject.<init>(JSONObject.java:156)
at org.json.JSONObject.<init>(JSONObject.java:173)
at com.robosoft.elections.MainActivity.onCreate(MainActivity.java:55)
at android.app.Activity.performCreate(Activity.java:5933)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
01-13 06:22:27.754 735-735/? E/EGL_emulation: tid 735: eglCreateSyncKHR(1181): error 0x3004 (EGL_BAD_ATTRIBUTE)
