Question

我创建了自己的Android项目并剪切并粘贴了本练习中的代码：

http://androidexample.com/Show_Phone_Contacts_In_AutoComplete_Suggestions_-_Android_Example%20/index.php?view=article_discription&aid=106&aaid=128#

当我构建项目时，我没有错误或警告。当我运行项目时，我得到一个错误的窗口：

令人讨厌的是，我不能让窗口变小，所以我无法点击任何按钮。我只是点击顶部的'X'来关闭它。

这是我的项目结构：

从哪里获得'AutocompleteMain'？（注意小c）我的类名为AutoCompleteMain。谢谢你的帮助。

如果你想知道的话，我确实将这项活动包含在我的Android Manifest中：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.androidexample.autocompleteedittext"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>
    <uses-permission android:name="android.permission.READ_CONTACTS" />

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="8" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.chris.dialler.AutoCompleteMain"
            android:label="@string/app_name"  >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

这是我班级的代码，AutoCompleteMain.java：

（有一点我注意到，在这个类中，是phoneNumber.toString（）和name.toString（）被突出显示，说它们是多余的。不知道这是否是问题的原因）

package com.example.chris.dialler;

import java.util.ArrayList;
import android.app.Activity;
import android.content.ContentResolver;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.inputmethod.InputMethodManager;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
import com.androidexample.autocompleteedittext.R;

public class AutoCompleteMain extends Activity implements  OnItemClickListener, OnItemSelectedListener  {

    // Initialize variables

    AutoCompleteTextView textView=null;
    private ArrayAdapter<String> adapter;

    // Store contacts values in these arraylist
    public static ArrayList<String> phoneValueArr = new ArrayList<String>();
    public static ArrayList<String> nameValueArr = new ArrayList<String>();

    EditText toNumber=null;
    String toNumberValue="";


    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle bundle) {
        super.onCreate(bundle);

        setContentView(R.layout.autocomplete_main);

        final Button Send = (Button) findViewById(R.id.Send);

        // Initialize AutoCompleteTextView values

        textView = (AutoCompleteTextView) findViewById(R.id.toNumber);

        //Create adapter
        adapter = new ArrayAdapter<String>
                (this, android.R.layout.simple_dropdown_item_1line, new ArrayList<String>());
        textView.setThreshold(1);

        //Set adapter to AutoCompleteTextView
        textView.setAdapter(adapter);
        textView.setOnItemSelectedListener(this);
        textView.setOnItemClickListener(this);

        // Read contact data and add data to ArrayAdapter
        // ArrayAdapter used by AutoCompleteTextView

        readContactData();


        /********** Button Click pass textView object ***********/
        Send.setOnClickListener(BtnAction(textView));


    }

    private OnClickListener BtnAction(final AutoCompleteTextView toNumber) {
        return new OnClickListener() {

            public void onClick(View v) {

                String NameSel = "";
                NameSel = toNumber.getText().toString();


                final String ToNumber = toNumberValue;


                if (ToNumber.length() == 0 ) {
                    Toast.makeText(getBaseContext(), "Please fill phone number",
                            Toast.LENGTH_SHORT).show();
                }
                else
                {
                    Toast.makeText(getBaseContext(), NameSel+" : "+toNumberValue,
                            Toast.LENGTH_LONG).show();
                }

            }
        };
    }


    // Read phone contact name and phone numbers

    private void readContactData() {

        try {

            /*********** Reading Contacts Name And Number **********/

            String phoneNumber = "";
            ContentResolver cr = getBaseContext()
                    .getContentResolver();

            //Query to get contact name

            Cursor cur = cr
                    .query(ContactsContract.Contacts.CONTENT_URI,
                            null,
                            null,
                            null,
                            null);

            // If data data found in contacts
            if (cur.getCount() > 0) {

                Log.i("AutocompleteContacts", "Reading   contacts........");

                int k=0;
                String name = "";

                while (cur.moveToNext())
                {

                    String id = cur
                            .getString(cur
                                    .getColumnIndex(ContactsContract.Contacts._ID));
                    name = cur
                            .getString(cur
                                    .getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));

                    //Check contact have phone number
                    if (Integer
                            .parseInt(cur
                                    .getString(cur
                                            .getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0)
                    {

                        //Create query to get phone number by contact id
                        Cursor pCur = cr
                                .query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                                        null,
                                        ContactsContract.CommonDataKinds.Phone.CONTACT_ID
                                                + " = ?",
                                        new String[] { id },
                                        null);
                        int j=0;

                        while (pCur
                                .moveToNext())
                        {
                            // Sometimes get multiple data
                            if(j==0)
                            {
                                // Get Phone number
                                phoneNumber =""+pCur.getString(pCur
                                        .getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));

                                // Add contacts names to adapter
                                adapter.add(name);

                                // Add ArrayList names to adapter
                                phoneValueArr.add(phoneNumber.toString());
                                nameValueArr.add(name.toString());

                                j++;
                                k++;
                            }
                        }  // End while loop
                        pCur.close();
                    } // End if

                }  // End while loop

            } // End Cursor value check
            cur.close();


        } catch (Exception e) {
            Log.i("AutocompleteContacts","Exception : "+ e);
        }


    }

    @Override
    public void onItemSelected(AdapterView<?> arg0, View arg1, int position,
                               long arg3) {
        // TODO Auto-generated method stub
        //Log.d("AutocompleteContacts", "onItemSelected() position " + position);
    }

    @Override
    public void onNothingSelected(AdapterView<?> arg0) {
        // TODO Auto-generated method stub

        InputMethodManager imm = (InputMethodManager) getSystemService(
                INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);

    }

    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
        // TODO Auto-generated method stub

        // Get Array index value for selected name
        int i = nameValueArr.indexOf(""+arg0.getItemAtPosition(arg2));

        // If name exist in name ArrayList
        if (i >= 0) {

            // Get Phone Number
            toNumberValue = phoneValueArr.get(i);

            InputMethodManager imm = (InputMethodManager) getSystemService(
                    INPUT_METHOD_SERVICE);
            imm.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);

            // Show Alert
            Toast.makeText(getBaseContext(),
                    "Position:"+arg2+" Name:"+arg0.getItemAtPosition(arg2)+" Number:"+toNumberValue,
                    Toast.LENGTH_LONG).show();

            Log.d("AutocompleteContacts",
                    "Position:"+arg2+" Name:"+arg0.getItemAtPosition(arg2)+" Number:"+toNumberValue);

        }

    }

    protected void onResume() {
        super.onResume();
    }

    protected void onDestroy() {
        super.onDestroy();
    }

}

Answer 1

phoneNumber和name已经是字符串，所以尝试将它们转换为字符串是不必要的。关于你的主要问题，过去我遇到过这样烦人的问题，我会尝试同步gradle或重启Android Studio。

Answer 2

您能提供该课程的代码吗？它是否扩展了任何类型的活动？从清单的外观来看，它被设置为您的启动活动。您必须确保它不仅仅是一个普通的Java类。它需要是一种活动（FragmentActivity，Activity，CombatActivity等等）。让我知道这是否有帮助！

为什么我收到消息'Youractivity.java不是活动子类或别名'

2 个答案: