我想查看新权限模型的工作原理，因此在应用的设置中我禁用了Contacts。然后我去app并尝试阅读Contacts并且......它有点工作：
try {
Uri result = data.getData();
int contentIdx;
cursor = getContentResolver().query(result, null, null, null, null);
contentIdx = cursor.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER);
if(cursor.moveToFirst()) {
content = cursor.getInt(contentIdx);
}
if(content > 0) {
contentIdx = cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME);
if(cursor.moveToFirst()) {
name = cursor.getString(contentIdx);
}
contentIdx = cursor.getColumnIndex(BaseColumns._ID);
if(cursor.moveToFirst()) {
content = cursor.getLong(contentIdx);
}
cursor = managedQuery(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, new String[] { Phone.NUMBER }, Data.CONTACT_ID + "=?", new String[] { String.valueOf(content) }, null);
if(cursor.moveToFirst()) {
number = cursor.getString(cursor.getColumnIndex(Phone.NUMBER));
}
}
} catch (Exception e) {
//SecurityException
}
SecurityException被抛出时java.lang.SecurityException：Permission Denial：从pid = 20123读取com.android.providers.contacts.HtcContactsProvider2 uri content：//com.android.contacts/data/phones，uid = 10593需要android.permission.READ_CONTACTS或grantUriPermission（）
为什么？
答案 0 :(得分：21)
Android marshmallow拥有新的权限系统。 您需要在运行时请求权限。 http://developer.android.com/training/permissions/requesting.html
示例：
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.tv_contact:{
askForContactPermission();
break;
}
}
}
private void getContact(){
Intent intent = new Intent(Intent.ACTION_PICK, ContactsContract.Contacts.CONTENT_URI);
startActivityForResult(intent, PICK_CONTACT);
}
public void askForContactPermission(){
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(getActivity(),Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(),
Manifest.permission.READ_CONTACTS)) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle("Contacts access needed");
builder.setPositiveButton(android.R.string.ok, null);
builder.setMessage("please confirm Contacts access");//TODO put real question
builder.setOnDismissListener(new DialogInterface.OnDismissListener() {
@TargetApi(Build.VERSION_CODES.M)
@Override
public void onDismiss(DialogInterface dialog) {
requestPermissions(
new String[]
{Manifest.permission.READ_CONTACTS}
, PERMISSION_REQUEST_CONTACT);
}
});
builder.show();
// Show an expanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission.
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(getActivity(),
new String[]{Manifest.permission.READ_CONTACTS},
PERMISSION_REQUEST_CONTACT);
// MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
// app-defined int constant. The callback method gets the
// result of the request.
}
}else{
getContact();
}
}
else{
getContact();
}
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case PERMISSION_REQUEST_CONTACT: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
getContact();
// permission was granted, yay! Do the
// contacts-related task you need to do.
} else {
ToastMaster.showMessage(getActivity(),"No permission for contacts");
// permission denied, boo! Disable the
// functionality that depends on this permission.
}
return;
}
// other 'case' lines to check for other
// permissions this app might request
}
}
答案 1 :(得分：1)
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.button:{
askForContactPermission();
break;
}
}
}
private void getContact(){
Cursor phones = getContentResolver().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));
Toast.makeText(getApplicationContext(),name+" "+phoneNumber, Toast.LENGTH_LONG).show();
}
phones.close();
}
public void askForContactPermission(){
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(this,Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.READ_CONTACTS)) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Contacts access needed");
builder.setPositiveButton(android.R.string.ok, null);
builder.setMessage("please confirm Contacts access");//TODO put real question
builder.setOnDismissListener(new DialogInterface.OnDismissListener() {
@TargetApi(Build.VERSION_CODES.M)
@Override
public void onDismiss(DialogInterface dialog) {
requestPermissions(
new String[]
{Manifest.permission.READ_CONTACTS}
, PERMISSION_REQUEST_CONTACT);
}
});
builder.show();
// Show an expanation to the user *asynchronously* -- don't block
// this thread waiting for the user's response! After the user
// sees the explanation, try again to request the permission.
} else {
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.READ_CONTACTS},
PERMISSION_REQUEST_CONTACT);
// MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
// app-defined int constant. The callback method gets the
// result of the request.
}
}else{
getContact();
}
}
else{
getContact();
}
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case PERMISSION_REQUEST_CONTACT: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
getContact();
// permission was granted, yay! Do the
// contacts-related task you need to do.
} else {
Toast.makeText(this, "No Permissions ", Toast.LENGTH_SHORT).show();
// permission denied, boo! Disable the
// functionality that depends on this permission.
}
return;
}
// other 'case' lines to check for other
// permissions this app might request
}
}