当我在我的模拟器中运行以下代码时，它会给出以下消息： “该应用已停止”
我正在尝试阅读联系人并创建一个显示联系人的列表视图，并允许用户选择他们的紧急联系人。
这是我的代码：
public class ContactsActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
final int REQUEST_READ_CONTACTS = 123;
MyAdapter madapt;
ArrayList<String> store = new ArrayList<String>();
String s1, s2, s3, s4;
String newline = "\n";
Button b;
CheckBox cb;
FileOutputStream out1;
List<String> name1 = new ArrayList<String>();
List<String> phone1 = new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_contacts);
AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setNegativeButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
})
.setMessage("This App requires GPS to work properly. Please keep the GPS enabled whenever you are using this App.")
.show();
getContacts(this.getContentResolver());
ListView lv = (ListView) findViewById(R.id.lv);
madapt = new MyAdapter();
lv.setAdapter(madapt);
lv.setOnItemClickListener(this);
lv.setItemsCanFocus(false);
lv.setTextFilterEnabled(true);
b = (Button) findViewById(R.id.button);
File file = new File(getFilesDir(), "contacts");
try {
out1 = openFileOutput("contacts", Context.MODE_PRIVATE);
} catch (FileNotFoundException e) {
}
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!store.isEmpty()) {
for (String s : store) {
s1 = s.replace("(", "");
s2 = s1.replace(")", "");
s3 = s2.replace(" ", "");
s4 = s3.replace("-", "");
try {
out1.write(s4.getBytes());
out1.write(newline.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
//TODO: Get intent to work
Intent sendstoredcontacts = new Intent(ContactsActivity.this, FirstActivity.class);
sendstoredcontacts.putStringArrayListExtra("CONTACTS", store); // getText() SHOULD NOT be static!!!
startActivity(sendstoredcontacts);
}
} else {
Toast.makeText(ContactsActivity.this, "At least 1 Contact must be selected !", Toast.LENGTH_SHORT).show();
}
}
});
}
private void getContacts(ContentResolver cr) {
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(".................." + phoneNumber);
name1.add(name);
phone1.add(phoneNumber);
}
phones.close();
}
public void askForContactPermission() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(ContactsActivity.this,
Manifest.permission.READ_CONTACTS)
!= PackageManager.PERMISSION_GRANTED) {
// Permission is not granted
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(ContactsActivity.this,
Manifest.permission.READ_CONTACTS)) {
// Show an explanation 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; request the permission
ActivityCompat.requestPermissions(ContactsActivity.this,
new String[]{Manifest.permission.READ_CONTACTS},
REQUEST_READ_CONTACTS);
// MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
// app-defined int constant. The callback method gets the
// result of the request.
}
} else {
// Permission has already been granted
}
}
}
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
}
class MyAdapter extends BaseAdapter {
LayoutInflater inf;
MyAdapter() {
inf = (LayoutInflater) ContactsActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return name1.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
View vi = convertView;
// if(convertView!=null)
vi = inf.inflate(R.layout.row, null);
TextView tv = (TextView) vi.findViewById(R.id.tv);
TextView textView = (TextView) vi.findViewById(R.id.textView);
cb = (CheckBox) vi.findViewById(R.id.checkBox);
cb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
if (isChecked) {
store.add(phone1.get(position));
} else {
store.remove(phone1.get(position));
}
}
});
tv.setText("Name: " + name1.get(position));
textView.setText("Number: " + phone1.get(position));
return vi;
}
}
private boolean checkPermission(String permission) {
int checkPermission = ContextCompat.checkSelfPermission(this, permission);
return (checkPermission == PackageManager.PERMISSION_GRANTED);
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case REQUEST_READ_CONTACTS: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted, yay! Do the
// contacts-related task you need to do.
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
}
return;
}
// other 'case' lines to check for other
// permissions this app might request.
}
}
}
这是我的崩溃日志：
致命的例外：主要 过程：com.example.android.vigilant，PID：2498 java.lang.RuntimeException：无法启动活动ComponentInfo {com.example.android.vigilant / com.example.android.vigilant.ContactsActivity}：java.lang.SecurityException：权限拒绝：打开提供程序com ProcessRecord中的.android.providers.contacts.ContactsProvider2 {df95360 2498：com.example.android.vigilant / u0a77}（pid = 2498，uid = 10077）需要android.permission.READ_CONTACTS
*编辑： 同样在我的清单文件中，我有：
<uses-permission android:name="android.permission.READ_CONTACTS" />
我如何启用我的权限工作？如何使用代码/我将特定代码添加到当前代码中来实现此代码？
我有API 25
答案 0 :(得分：0)
您仍需要在清单中添加权限
<uses-permission android:name="android.permission.READ_CONTACTS" />
答案 1 :(得分：0)
你什么时候打电话给你的许可方法？
通过以下方式更新您的权限方法。
public boolean checkAndAskForContactPermission() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(ContactsActivity.this,
Manifest.permission.READ_CONTACTS)
!= PackageManager.PERMISSION_GRANTED) {
return false;
// Permission is not granted
// Should we show an explanation?
if (ActivityCompat.shouldShowRequestPermissionRationale(ContactsActivity.this,
Manifest.permission.READ_CONTACTS)) {
// Show an explanation 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; request the permission
ActivityCompat.requestPermissions(ContactsActivity.this,
new String[]{Manifest.permission.READ_CONTACTS},
REQUEST_READ_CONTACTS);
// MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
// app-defined int constant. The callback method gets the
// result of the request.
}
} else {
return true;
// Permission has already been granted
}
} else return true;
}
并在onCreate（）之后调用此方法，如
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_contacts);
if (!checkAndAskForContactPermission()) return;
... your stuff here
}
如果有任何其他问题，请告诉我。