运行显示"未找到任何联系人，请检查uri，"
MainActivity类
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
final Uri uri= ContactsContract.Contacts.CONTENT_URI; //Android联系人uri
ListView listView; //列表控件
ChooseAdapter myAdapter; //列表适配器
List<Contact> contacts; //存放联系人列表(姓名+手机号)，
List<String> receiverName = new ArrayList<String>(); //短信接收人的姓名
List<String> receiverPhone = new ArrayList<String>(); //短信接收人的手机号
String receiverPhones; //短信接收人的手机号字符串，中间以分号分隔
ImageView backBtn; //作为返回按钮
ImageView imageButton; //作为选择确认按钮
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);//取消对应用程序标题栏的显示
setContentView(R.layout.activity_main);
//权限处理
if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED){
ActivityCompat.requestPermissions(MainActivity.this,new String[]{Manifest.permission.READ_CONTACTS},1);
}else {
new GetContact().execute(); // 调用内部类，执行异步任务，获得联系人
//getContacts();initView(); //阻塞式、耗时，联系人个数较多时出现白屏
}
//控件对象监听
backBtn = findViewById(R.id.onBack);backBtn.setOnClickListener(this);
imageButton = findViewById(R.id.imageButton);imageButton.setOnClickListener(this);
contacts = new ArrayList<Contact>();
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch (requestCode){
case 1:
if(grantResults.length>0){
for(int result : grantResults){
if(result != PackageManager.PERMISSION_GRANTED){
Toast.makeText(this, "权限不足！", Toast.LENGTH_SHORT).show();
finish();
return;
}
}
}
new GetContact().execute(); //执行异步线程
break;
}
}
@Override //监听实现按钮功能的两个图像
public void onClick(View arg0) {
switch (arg0.getId()) {
case R.id.onBack:
finish();
break;
case R.id.imageButton:
setMessageToSome(); //向选择的联系人群发短信
break;
}
}
//考虑到目前手机联系人数量日前增多，使用异步任务类以免阻塞UI主线程
class GetContact extends AsyncTask<String, Integer, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
Toast.makeText(MainActivity.this, "联系人信息加载中，稍候...", Toast.LENGTH_SHORT).show();
}
@Override
protected String doInBackground(String... arg0) { //接收单个值或数组，还可以接收离散变量
getContacts();//获取所有联系人并存放至contacts
return null;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
initView(); //呈现视图
}
}
private void getContacts() { //获得所有联系人
Contact tmpContact; //声明自定义实体类对象
contacts.clear();
Cursor cursor =getContentResolver().query(uri,null,null,null,
ContactsContract.Contacts.DISPLAY_NAME + " COLLATE LOCALIZED ASC");
if (cursor.moveToFirst()) { //如果选择了记录
int idColumn = cursor.getColumnIndex(ContactsContract.Contacts._ID);
int displayNameColumn = cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME);
do{ //循环遍历
tmpContact = new Contact();
String contactId = cursor.getString(idColumn); //获得联系人ID
String disPlayName = cursor.getString(displayNameColumn); //获得联系人姓名
//联系人的电话数量，没有这返回值为0
int phoneCount = cursor.getInt(cursor.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER));
tmpContact.setName(disPlayName);
if (phoneCount > 0) {
// 获得联系人的电话号码
Cursor phones = getContentResolver().query(
ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID+" = " + contactId, null, null);
if (phones.moveToFirst()) {
String tmpPhone = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
//有些手机（如小米）登记手机号，多了2位空格，如155 2764 3858
//手机号以“1”打头
if(tmpPhone.length() >= 11&&tmpPhone.substring(0, 1).equals("1"))
tmpContact.setPhone(tmpPhone);
}
}
if(tmpContact.getPhone()!= null) {
contacts.add(tmpContact);
Log.i("myTag",tmpContact.toString());
}else{
Log.i("myTag","none");
}
} while (cursor.moveToNext());
}
}
void initView() { //呈现供勾选联系人的界面
listView = findViewById(R.id.listView);
myAdapter = new ChooseAdapter(this, contacts);
listView.setAdapter(myAdapter);
listView.setItemsCanFocus(false);
listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
//列表项选择监听，同时进行了勾选或取消勾选操作
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(MainActivity.this,
"点击了id为" + position + "的联系人！", Toast.LENGTH_SHORT).show();
ListItemView listItemView = (ListItemView) view.getTag();
boolean check = listItemView.checkBox.isChecked();
if (check) {
listItemView.checkBox.setChecked(false);
check = false;
} else {
listItemView.checkBox.setChecked(true);
check = true;
}
ChooseAdapter.checkResult.put(position, check);
}
});
if (contacts.size()>0) {
listView.setClickable(true);
myAdapter.refresh(contacts); //调用适配器类定义的方法
}else{
Toast.makeText(MainActivity.this, "未找到任何联系人，请检查uri，", Toast.LENGTH_SHORT).show();
finish();
}
}
//先构建对话框内容和群发的手机号，调用系统的短信程序，向选择的联系人发送短信
public void setMessageToSome() {
//选择了联系人进入短信编辑界面时，可能还会按返回键重新选择。所以，调用本方法前，重新统计
receiverName.clear();receiverPhone.clear();
for (int i = 0; i < ChooseAdapter.checkResult.size(); i++) {
if (ChooseAdapter.checkResult.get(i)) {
receiverName.add(contacts.get(i).getName());
receiverPhone.add(contacts.get(i).getPhone());
}
}
if (receiverName.size() == 0) { //未勾选联系人
new AlertDialog.Builder(this).setTitle("没有选中任何记录").setPositiveButton("确定", null).show();
} else {
StringBuilder sb = new StringBuilder();
sb.append("接收人:" + receiverName.get(0));
receiverPhones = receiverPhone.get(0);
for (int i = 1; i < receiverName.size(); i++) {
sb.append("," + receiverName.get(i)); //构建对话框的内容，姓名之间用逗号分隔
receiverPhones += ";" + receiverPhone.get(i); //群发的手机号码之间要求用分号分隔
}
new AlertDialog.Builder(this)
.setTitle("是否确定？")
.setMessage(sb)
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
//使用系统的短信程序
Intent intent=new Intent(Intent.ACTION_VIEW);
//短信界面中显示的接收人字符串由接收人电话字符串决定
intent.setData(Uri.parse("sms:"+receiverPhones+"?body=这儿写群发短信内容"));
startActivity(intent); //调用系统的短信程序
}
})
.setNegativeButton("取消", null)
.show();
}
}
}
Contact类
class Contact { //自定义的实体类
private String name;
private String phone;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
@Override
public String toString() {
return "Contact{" + "name='" + name + '\'' + ", phone='" + phone + '\'' + '}';
}
}
提示是在以下代码行提示的：
说明contacts这里面没有获取到联系人的数据，那你就要检查下 ContactsContract.Contacts.CONTENT_URI这个是不是正确的获取联系人的接口，其次，代码中哪个地方将数据放入到 了contacts中，有可能根本就没有放任何数据到contacts中。调试下代码看看