我在应用程序中从手机访问联系人时遇到错误。 我添加了android marshmallow的访问权限。当我接受许可时，应用程序崩溃。而且我不确定我使用过的权限代码......有人可以告诉我哪里出错了......代码就是......
public class ContactsDisplay extends AppCompatActivity implements OnItemClickListener,FragmentDrawer.FragmentDrawerListener {
private static String TAG = ContactsDisplay.class.getSimpleName();
private Toolbar mToolbar;
private FragmentDrawer drawerFragment;
Cursor phones;
List<String> name1 = new ArrayList<String>();
List<String> phno1 = new ArrayList<String>();
MyAdapter ma ;
Button select;
private static final int MY_PERMISSIONS_REQUEST_READ_CONTACTS = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//getActionBar().setDisplayShowTitleEnabled(false);
setContentView(R.layout.contacts_display);
mToolbar = (Toolbar) findViewById(R.id.toolbar);
ImageView img = (ImageView)findViewById(R.id.imageView10);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
drawerFragment = (FragmentDrawer)
getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer);
drawerFragment.setUp(R.id.fragment_navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout), mToolbar);
drawerFragment.setDrawerListener(this);
// display the second navigation drawer view on app launch
displayView(0);
getAllContacts(this.getContentResolver());
ListView lv= (ListView) findViewById(R.id.lv);
ma = new MyAdapter();
lv.setAdapter(ma);
lv.setOnItemClickListener(this);
lv.setItemsCanFocus(false);
lv.setTextFilterEnabled(true);
// adding
select = (Button) findViewById(R.id.button1);
select.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v) {
StringBuilder checkedcontacts= new StringBuilder();
System.out.println(".............."+ma.mCheckStates.size());
for(int i = 0; i < name1.size(); i++)
{
if(ma.mCheckStates.get(i)==true)
{
checkedcontacts.append(name1.get(i).toString());
checkedcontacts.append("\n");
}
else
{
System.out.println("Not Checked......"+name1.get(i).toString());
}
}
Toast.makeText(ContactsDisplay.this, checkedcontacts,Toast.LENGTH_LONG).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
ma.toggle(position);
}
public void getAllContacts(ContentResolver cr) {
int result = ContextCompat.checkSelfPermission(ContactsDisplay.this, Manifest.permission.READ_CONTACTS);
if (result == PackageManager.PERMISSION_GRANTED){
phones = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,null,null, null);
contactsdisplay();
} else {
requestForLocationPermission();
}
}
private void requestForLocationPermission()
{
if (ActivityCompat.shouldShowRequestPermissionRationale(ContactsDisplay.this, Manifest.permission.READ_CONTACTS))
{
}
else {
ActivityCompat.requestPermissions(ContactsDisplay.this, new String[]{Manifest.permission.READ_CONTACTS}, MY_PERMISSIONS_REQUEST_READ_CONTACTS);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults)
{
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_READ_CONTACTS:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
{
getAllContacts(ContactsDisplay.this.getContentResolver());
contactsdisplay();
}
break;
}
}
public void contactsdisplay() {
phones.moveToFirst();
do
{
String name=phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
String phoneNumber = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
System.out.println(".................."+phoneNumber);
name1.add(name);
phno1.add(phoneNumber);
}while (phones.moveToNext());
}
class MyAdapter extends BaseAdapter implements CompoundButton.OnCheckedChangeListener
{ private SparseBooleanArray mCheckStates;
LayoutInflater mInflater;
TextView tv1,tv;
CheckBox cb;
MyAdapter()
{
mCheckStates = new SparseBooleanArray(name1.size());
mInflater = (LayoutInflater)ContactsDisplay.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return name1.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View vi=convertView;
if(convertView==null)
vi = mInflater.inflate(R.layout.row, null);
TextView tv= (TextView) vi.findViewById(R.id.textView1);
tv1= (TextView) vi.findViewById(R.id.textView2);
cb = (CheckBox) vi.findViewById(R.id.checkBox_id);
tv.setText("Name :"+ name1.get(position));
tv1.setText("Phone No :"+ phno1.get(position));
cb.setTag(position);
cb.setChecked(mCheckStates.get(position, false));
cb.setOnCheckedChangeListener(this);
return vi;
}
public boolean isChecked(int position) {
return mCheckStates.get(position, false);
}
public void setChecked(int position, boolean isChecked) {
mCheckStates.put(position, isChecked);
System.out.println("hello...........");
notifyDataSetChanged();
}
public void toggle(int position) {
setChecked(position, !isChecked(position));
}
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
mCheckStates.put((Integer) buttonView.getTag(), isChecked);
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
if(id == R.id.action_search){
/*Toast.makeText(getApplicationContext(), vault_no, Toast.LENGTH_SHORT).show();
return true;*/
logout();
}
if(id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private void logout(){
//Creating an alert dialog to confirm logout
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
alertDialogBuilder.setMessage("Are you sure you want to logout?");
alertDialogBuilder.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
//Getting out sharedpreferences
SharedPreferences preferences = getSharedPreferences(ClickToLogin.SHARED_PREF_NAME, Context.MODE_PRIVATE);
//Getting editor
SharedPreferences.Editor editor = preferences.edit();
//Puting the value false for loggedin
editor.putBoolean(ClickToLogin.LOGGEDIN_SHARED_PREF, false);
//Putting blank value to email
editor.putString(ProfileLogin.EMAIL_SHARED_PREF, "");
editor.putString(ClickToLogin.FULLNAME_SHARED_PREF, "");
editor.putString(ClickToLogin.MOBILE_SHARED_PREF, "");
editor.putString(ClickToLogin.POB_SHARED_PREF, "");
editor.putString(ClickToLogin.DOB_SHARED_PREF, "");
editor.putString(ClickToLogin.PIN_SHARED_PREF, "");
editor.putString(ClickToLogin.EMAIL_SHARED_PREF, "");
editor.putString(ClickToLogin.DOC_SHARED_PREF, "");
editor.putString(ClickToLogin.YEAR_SHARED_PREF, "");
editor.clear();
//Saving the sharedpreferences
editor.commit();
//Starting login activity
Intent intent = new Intent(ContactsDisplay.this, ProfileLogin.class);
startActivity(intent);
}
});
alertDialogBuilder.setNegativeButton("No",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
}
});
//Showing the alert dialog
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
}
@Override
public void onDrawerItemSelected(View view, int position) {
displayView(position);
}
private void displayView(int position) {
Fragment fragment = null;
String title = getString(R.string.app_name);
switch (position) {
case 0:
/*fragment = new HomeFragment();*/
title = "Work Details1";
break;
case 1:
/*fragment = new ProfileFragment();
title = getString(R.string.title_profile);
break;*/
startActivity(new Intent(this, ContactsDisplay.class));
return;
case 2:
startActivity(new Intent (this,Events.class));
return;
/*fragment = new AboutFragment();
title = getString(R.string.title_about);
break;*/
case 3:
fragment = new MessagesFragment();
title = getString(R.string.title_messages);
break;
case 4:
fragment = new VideoFragment();
title = getString(R.string.title_video);
break;
case 5:
fragment = new GalleryFragment();
title = getString(R.string.title_gallery);
break;
case 6:
fragment = new GalleryFragment();
title = "Gallery";
break;
case 7:
fragment = new EventsFragment();
title = getString(R.string.title_events);
break;
default:
break;
}
if (fragment != null) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.container_body, fragment);
fragmentTransaction.commit();
// set the toolbar title
getSupportActionBar().setTitle(title);
}
}
@Override
public void onBackPressed() {
finish();
Intent intent = new Intent(ContactsDisplay.this, DocUpload.class);
intent.setAction(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
}
}
这里是logcat
06-13 05:37:22.000 11581-11581/com.example.miisky E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.miisky, PID: 11581
java.lang.RuntimeException: Failure delivering result ResultInfo{who=@android:requestPermissions:, request=1, result=-1, data=Intent { act=android.content.pm.action.REQUEST_PERMISSIONS (has extras) }} to activity {com.example.miisky/com.example.miisky.ContactsDisplay}: java.lang.NullPointerException: Attempt to invoke interface method 'boolean android.database.Cursor.moveToNext()' on a null object reference
at android.app.ActivityThread.deliverResults(ActivityThread.java:3699)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3742)
at android.app.ActivityThread.-wrap16(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'boolean android.database.Cursor.moveToNext()' on a null object reference
at com.example.miisky.ContactsDisplay.contactsdisplay(ContactsDisplay.java:199)
at com.example.miisky.ContactsDisplay.onRequestPermissionsResult(ContactsDisplay.java:190)
at android.app.Activity.dispatchRequestPermissionsResult(Activity.java:6553)
at android.app.Activity.dispatchActivityResult(Activity.java:6432)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3695)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3742)
at android.app.ActivityThread.-wrap16(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
答案 0 :(得分：1)
您正在调用已检查所需权限的getAllContacts（），如果已授予权限，则您将获得联系人列表。您的代码问题是，当您没有权限时，您要求它。所以现在当用户允许或拒绝时，你再次需要从onRequestPermissionsResult（）调用相同的方法getAllContacts（）。目前正在发生用户允许，但您还没有取出联系人并直接阅读它。
在onRequestPermissionsResult（）中添加你的getAllContacts（）调用，即
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults){
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_READ_CONTACTS:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
{
getAllContacts(ContactsDisplay.this.getContentResolver());
contactsdisplay();
}else{
//Show a dialog with explanation why you want contacts permission and ask for permission again or else simply display appropriate error or alert message.
}
break;
}
}
因此，首先要解释当你调用getAllContacts（）并且你已经获得了权限时，你的Cursor手机将拥有值。但是，如果您没有权限，那么您将显示一个请求权限的对话框，当用户允许您直接调用contactsdisplay（）时，这是错误的。你必须首先获得getAllContacts（）作为刚刚授予你权限的用户，然后调用contactsdisplay（）。
答案 1 :(得分：0)
我的代码的问题是AppcompatActivity..i将AppcompatActivity更改为Actitvity ..现在代码运行良好..即使访问联系人时要求访问marshmallow的权限..
所以这是最终的代码..
public class DisplayContact extends Activity implements OnItemClickListener{
//ArrayList to store name and phone number
List<String> name1 = new ArrayList<String>();
List<String> phno1 = new ArrayList<String>();
MyAdapter ma ;
Button select;
Cursor phones;
private static final int MY_PERMISSIONS_REQUEST_READ_CONTACTS = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getActionBar().setDisplayShowTitleEnabled(false);
setContentView(R.layout.display);
getAllContacts(this.getContentResolver());
ListView lv= (ListView) findViewById(R.id.lv);
ma = new MyAdapter();
lv.setAdapter(ma);
lv.setOnItemClickListener(this);
lv.setItemsCanFocus(false);
lv.setTextFilterEnabled(true);
// adding
select = (Button) findViewById(R.id.button1);
select.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v) {
StringBuilder checkedcontacts= new StringBuilder();
for(int i = 0; i < name1.size(); i++)
{
if(ma.mCheckStates.get(i)==true)
{
checkedcontacts.append(name1.get(i).toString());
checkedcontacts.append(phno1.get(i).toString());
checkedcontacts.append("\n");
else
{
}
}
Toast.makeText(DisplayContact.this, checkedcontacts, Toast.LENGTH_LONG).show();
}
});
}
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
// TODO Auto-generated method stub
ma.toggle(arg2);
}
public void getAllContacts(ContentResolver cr) {
int result = ContextCompat.checkSelfPermission(DisplayContact.this, Manifest.permission.READ_CONTACTS);
if (result == PackageManager.PERMISSION_GRANTED){
phones = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,null,null, null);
contactsdisplay();
} else {
requestForLocationPermission();
}
}
private void requestForLocationPermission()
{
if (ActivityCompat.shouldShowRequestPermissionRationale(DisplayContact.this, Manifest.permission.READ_CONTACTS))
{
}
else {
ActivityCompat.requestPermissions(DisplayContact.this, new String[]{Manifest.permission.READ_CONTACTS}, MY_PERMISSIONS_REQUEST_READ_CONTACTS);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults)
{
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_READ_CONTACTS:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
{
getAllContacts(DisplayContact.this.getContentResolver());
contactsdisplay();
}
break;
}
}
public void contactsdisplay() {
//Cursor phones = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,null,null, null);
while (phones.moveToNext())
{
String name=phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
String phoneNumber = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
System.out.println(".................."+name+ "" +phoneNumber);
name1.add(name);
phno1.add(phoneNumber);
}
phones.close();
}
class MyAdapter extends BaseAdapter implements CompoundButton.OnCheckedChangeListener
{ private SparseBooleanArray mCheckStates;
LayoutInflater mInflater;
TextView tv1,tv;
CheckBox cb;
MyAdapter()
{
mCheckStates = new SparseBooleanArray(name1.size());
mInflater = (LayoutInflater)DisplayContact.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return name1.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View vi=convertView;
if(convertView==null)
vi = mInflater.inflate(R.layout.row, null);
tv= (TextView) vi.findViewById(R.id.contact_name);
tv1= (TextView) vi.findViewById(R.id.phone_number);
cb = (CheckBox) vi.findViewById(R.id.checkBox_id);
tv.setText("Name :"+ name1.get(position));
tv1.setText("Phone No :"+ phno1.get(position));
cb.setTag(position);
cb.setChecked(mCheckStates.get(position, false));
cb.setOnCheckedChangeListener(this);
return vi;
}
public boolean isChecked(int position) {
return mCheckStates.get(position, false);
}
public void setChecked(int position, boolean isChecked) {
mCheckStates.put(position, isChecked);
}
public void toggle(int position) {
setChecked(position, !isChecked(position));
}
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
mCheckStates.put((Integer) buttonView.getTag(), isChecked);
}
}
@Override
public void onBackPressed() {
finish();
Intent intent = new Intent(DisplayContact.this, ProfileDisplay.class);
intent.setAction(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
}
}