Question

我正在尝试在我的Android应用程序中创建一个联系人管理器功能（使用android studio创建。目前我的联系人显示在列表视图中，如代码片段所示：

  <ImageView
    android:layout_width="75dp"
    android:layout_height="75dp"
    android:id="@+id/ivContactImage"
    android:padding="10dp" />

<LinearLayout
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Contact Name"
        android:id="@+id/contactName"
        android:textColor="#040000"
        android:textSize="17dp"
        android:layout_marginTop="5dp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Phone"
        android:id="@+id/phoneNumber"
        android:textSize="15dp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Email"
        android:id="@+id/emailAddress"
        android:textSize="15dp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Address"
        android:id="@+id/cAddress"
        android:textSize="15dp" />
</LinearLayout>

如果可能，我想按字母顺序对这些结果进行排序？并实现搜索栏功能，您可以在其中搜索列表中的所有联系人。我不太清楚从哪里开始。

到目前为止，我一直在关注本教程 - https://youtu.be/Aqzo_a6Bh4g?list=PL_PaSTBkUwk4PXlhZIe4COpwnWeCRnw2F

我的主要活动java代码：

    EditText nameTxt, phoneTxt, emailTxt, addressTxt;
    ImageView contactImageimgView;
    List<Contact> Contacts = new ArrayList<Contact>();
    ListView contactListView;
    Uri imageUri = null;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_contact_list);

        nameTxt = (EditText) findViewById(R.id.txtName);
        phoneTxt = (EditText) findViewById(R.id.txtPhone);
        emailTxt = (EditText) findViewById(R.id.txtEmail);
        addressTxt = (EditText) findViewById(R.id.txtAddress);
        contactListView = (ListView) findViewById(R.id.listView);
        contactImageimgView = (ImageView) findViewById(R.id.imgViewContactImage);

        TabHost tabHost = (TabHost) findViewById(R.id.tabHost);

        tabHost.setup();

        TabHost.TabSpec tabSpec = tabHost.newTabSpec("Creator");
        tabSpec.setContent(R.id.tabCreator);
        tabSpec.setIndicator("add contact");
        tabHost.addTab(tabSpec);

        tabSpec = tabHost.newTabSpec("List");
        tabSpec.setContent(R.id.tabContactList);
        tabSpec.setIndicator("contact list");
        tabHost.addTab(tabSpec);


        final Button addBtn = (Button) findViewById(R.id.btnAdd);
        addBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Contacts.add(new Contact(nameTxt.getText().toString(), phoneTxt.getText().toString(), emailTxt.getText().toString(), addressTxt.getText().toString(), imageUri));
                populateList();
                Toast.makeText(getApplicationContext(), nameTxt.getText().toString() + " has been added to your Contacts!", Toast.LENGTH_SHORT).show();
            }
        });


        nameTxt.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence charSequence, int start, int before, int count) {
                addBtn.setEnabled(!nameTxt.getText().toString().trim().isEmpty());
            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });

        contactImageimgView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setType("image/*");
                intent.setAction(Intent.ACTION_GET_CONTENT);
                startActivityForResult(Intent.createChooser(intent, "Select Contact Image"), 1);

            }
        });
    }

    public void onActivityResult(int reqCode, int resCode, Intent data) {
        if (resCode == RESULT_OK) {
            if (reqCode == 1) {
                imageUri = data.getData();
                contactImageimgView.setImageURI(data.getData());
            }
        }
    }

    private void populateList() {
        ArrayAdapter<Contact> adapter = new ContactListAdapter();
        contactListView.setAdapter(adapter);
    }

    private class ContactListAdapter extends ArrayAdapter<Contact> {
        public ContactListAdapter() {
            super (ContactList.this, R.layout.listview_item, Contacts);
        }

        @Override
        public View getView(int position, View view, ViewGroup parent) {
            if (view == null)
                view = getLayoutInflater().inflate(R.layout.listview_item, parent, false);

            Contact currentContact = Contacts.get(position);

            TextView name = (TextView) view.findViewById(R.id.contactName);
            name.setText(currentContact.getName());
            TextView phone = (TextView) view.findViewById(R.id.phoneNumber);
            phone.setText(currentContact.getPhone());
            TextView email = (TextView) view.findViewById(R.id.emailAddress);
            email.setText(currentContact.getEmail());
            TextView address = (TextView) view.findViewById(R.id.cAddress);
            address.setText(currentContact.getAddress());
            ImageView ivContactImage = (ImageView) view.findViewById(R.id.ivContactImage);
            ivContactImage.setImageURI(currentContact.get_imageURI());

            return view;
        }
    }

}

实现java.util.Collections.Sort（Contacts）时出错

错误：（123,34）错误：找不到合适的排序方法（列表）方法Collections.sort（List，Comparator）不适用（无法从参数实例化，因为实际和形式参数列表的长度不同）方法Collections.sort（List）不适用（推断类型不符合声明的界限）推断：联系 bound（s）：可比较）其中T＃1，T＃2是类型变量： T＃1扩展了在方法排序中声明的Object（List，Comparator） T＃2扩展了方法排序（List）中声明的Comparable

按字母顺序和搜索功能对列表视图结果进行排序

0 个答案: