My application is always crashed at this moment, guru here please help me to solved. Thanks.The situation now is
as mentioned in title above. Hereby is my AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2009 The Android Open Source Project
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "
AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.android.contactmanager"
android:versionCode="1" android:versionName="1.0">
<uses-sdk android:minSdkVersion="10" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MANAGE_ACCOUNTS"/>
<uses-permission android:name="android.permission.WRITE_OWNER_DATA"/>
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.CALL_PHONE"/>
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.WRITE_CONTACTS" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.GET_ACCOUNTS"/>
<application android:label="@string/app_name" android:icon="@drawable/icon" android:allowBackup="true">
<!-- --><activity android:name=".ContactManager" android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="ContactAdder" android:label="@string/addContactTitle">
</activity>
<activity android:name=".SingleListContact"
android:label="Contact Person Details">
</activity>
</application>
</manifest>
The SingleListContact.java
package com.example.android.contactmanager;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
public class SingleListContact extends Activity{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.single_list_contact_view);
TextView txtContact = (TextView) findViewById(R.id.contactList);
Intent i = getIntent();
// getting attached intent data
String contact = i.getStringExtra("contact");
// displaying selected product name
txtContact.setText(contact);
}
}
My ContactManager.java
as below
/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "
AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.contactmanager;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;
public final class ContactManager extends Activity implements OnItemClickListener
{
public static final String TAG = "ContactManager";
private Button mAddAccountButton;
private ListView mContactList;
private boolean mShowInvisible;
//public BooleanObservable ShowInvisible = new BooleanObservable(false);
private CheckBox mShowInvisibleControl;
/**
* Called when the activity is first created. Responsible for initializing the UI.
*/
@Override
public void onCreate(Bundle savedInstanceState)
{
Log.v(TAG, "Activity State: onCreate()");
super.onCreate(savedInstanceState);
setContentView(R.layout.contact_manager);
// Obtain handles to UI objects
mAddAccountButton = (Button) findViewById(R.id.addContactButton);
mContactList = (ListView) findViewById(R.id.contactList);
mShowInvisibleControl = (CheckBox) findViewById(R.id.showInvisible);
// Initialise class properties
mShowInvisible = false;
mShowInvisibleControl.setChecked(mShowInvisible);
// Register handler for UI elements
mAddAccountButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Log.d(TAG, "mAddAccountButton clicked");
launchContactAdder();
}
});
mShowInvisibleControl.setOnCheckedChangeListener(new OnCheckedChangeListener()
{
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
{
Log.d(TAG, "mShowInvisibleControl changed: " + isChecked);
mShowInvisible = isChecked;
populateContactList();
}
});
mContactList = (ListView) findViewById(R.id.contactList);
mContactList.setOnItemClickListener(this);
// Populate the contact
list
populateContactList();
}
/**
* Populate the contact
list based on account currently selected in the account spinner.
*/
private void populateContactList() {
// Build adapter with contact entries
Cursor cursor = getContacts();
String[] fields = new String[] {
ContactsContract.Data.DISPLAY_NAME
};
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.contact_entry, cursor,
fields, new int[] {R.id.contactEntryText});
mContactList.setAdapter(adapter);
}
/**
* Obtains the contact
list for the currently selected account.
*
* @return A cursor for for accessing the contact
list.
*/
private Cursor getContacts()
{
// Run query
Uri uri = ContactsContract.Contacts.CONTENT_URI;
String[] projection = new String[]
{
ContactsContract.Contacts._ID,
ContactsContract.Contacts.DISPLAY_NAME
};
String selection = ContactsContract.Contacts.IN_VISIBLE_GROUP + " = '" + (mShowInvisible ? "0" : "1") + "'";
//String selection = ContactsContract.Contacts.IN_VISIBLE_GROUP + " = '" + (mShowInvisible.get() ? "0" : "1") + "'";
String[] selectionArgs = null;
String sortOrder = ContactsContract.Contacts.DISPLAY_NAME + " COLLATE LOCALIZED ASC";
return this.managedQuery(uri, projection, selection, selectionArgs, sortOrder);
}
/**
* Launches the ContactAdder activity to add a new contact to the selected account.
*/
protected void launchContactAdder()
{
Intent i = new Intent(this, ContactAdder.class);
startActivity(i);
}
public void onItemClick(AdapterView<?> l, View v, int position, long id) {
Log.i("TAG", "You clicked item " + id + " at position " + position);
// Here you start the intent to show the contact details
// selected item
TextView tv=(TextView)v.findViewById(R.id.contactList);
String allcontactlist = tv.getText().toString();
// Launching new Activity on selecting single
List Item
Intent i = new Intent(getApplicationContext(), SingleListContact.class);
// sending data to new activity
i.putExtra("Contact Person", allcontactlist);
startActivity(i);
}
}
contact_entry.xml
<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2009 The Android Open Source Project
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "
AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<ListView android:layout_width="wrap_content"
android:id="@+id/contactList"
android:layout_height="0dp"
android:padding="10dp"
android:textSize="200sp"
android:layout_weight="10"/>
<CheckBox android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/showInvisible"
android:text="@string/showInvisible"/>
<Button android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/addContactButton"
android:text="@string/addContactButtonLabel"/>
</LinearLayout>
Logcat result:
12-05 05:00:31.289: E/AndroidRuntime(642): FATAL EXCEPTION: main
12-05 05:00:31.289: E/AndroidRuntime(642): java.lang.NullPointerException
12-05 05:00:31.289: E/AndroidRuntime(642): at com.example.android.contactmanager.ContactManager.onItemClick(ContactManager.java:148)
12-05 05:00:31.289: E/AndroidRuntime(642): at android.widget.AdapterView.performItemClick(AdapterView.java:284)
12-05 05:00:31.289: E/AndroidRuntime(642): at android.widget.ListView.performItemClick(ListView.java:3513)
12-05 05:00:31.289: E/AndroidRuntime(642): at android.widget.AbsListView$PerformClick.run(AbsListView.java:1812)
12-05 05:00:31.289: E/AndroidRuntime(642): at android.os.Handler.handleCallback(Handler.java:587)
12-05 05:00:31.289: E/AndroidRuntime(642): at android.os.Handler.dispatchMessage(Handler.java:92)
12-05 05:00:31.289: E/AndroidRuntime(642): at android.os.Looper.loop(Looper.java:123)
12-05 05:00:31.289: E/AndroidRuntime(642): at android.app.ActivityThread.main(ActivityThread.java:3683)
12-05 05:00:31.289: E/AndroidRuntime(642): at java.lang.reflect.Method.invokeNative(Native Method)
12-05 05:00:31.289: E/AndroidRuntime(642): at java.lang.reflect.Method.invoke(Method.java:507)
12-05 05:00:31.289: E/AndroidRuntime(642): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-05 05:00:31.289: E/AndroidRuntime(642): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-05 05:00:31.289: E/AndroidRuntime(642): at dalvik.system.NativeStart.main(Native Method)
