Android应用开发实践-优快云博客

本文链接：https://blog.youkuaiyun.com/Wandering_sea/article/details/102615071

本文详细介绍了一个基于Android平台的应用开发过程，包括欢迎页面的动画实现、用户注册与登录功能的开发，以及主页面联系人列表的读取与显示。通过解析源代码，展示了如何使用ViewPager进行页面切换，利用ContentResolver与SQLite数据库进行数据存储与查询，同时介绍了如何获取手机通讯录并以列表形式展示。

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@[toc] 作业

欢迎页面

activity

package com.example.exercise_four;

import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Handler;
import android.os.Message;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import java.util.ArrayList;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;

public class Wel_Activity extends AppCompatActivity {

    private ViewPager pager;
    private List<Fragment> lists = new ArrayList<>();
    private Timer timer;
    private Button button;
    private int index = 0;
    Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case 100:
                    pager.setCurrentItem(index);
                    index++;
                    if (index == lists.size()) {
                        index = 0;
                        timer.cancel();
                    }
                    break;
            }

        }
    };

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

        pager = findViewById(R.id.viewpager);
        button = findViewById(R.id.wel_but);


        SharedPreferences preferences = getSharedPreferences("wel", MODE_PRIVATE);
        boolean wel = preferences.getBoolean("isWel",false);
        if(wel){
            Intent intent = new Intent(Wel_Activity.this, Register_Activity.class);
            startActivity(intent);
        }

        for (int i = 0; i < 3; i++) {
            Wel_Fragment fragment = new Wel_Fragment();
            String str = "这是第" + (i + 1) + "个fragment";
            Bundle bundle = new Bundle();
            bundle.putString("msg", str);
            fragment.setArguments(bundle);
            lists.add(fragment);
        }


        pager.setAdapter(new FragmentStatePagerAdapter(getSupportFragmentManager()) {
            @Override
            public Fragment getItem(int i) {
                return lists.get(i);
            }

            @Override
            public int getCount() {
                return lists.size();
            }
        });

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(Wel_Activity.this, Register_Activity.class);
                startActivity(intent);
                finish();
            }
        });


//        pager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
//            @Override
//            public void onPageScrolled(int i, float v, int i1) {
//
//            }
//
//            @Override
//            public void onPageSelected(int i) {
//                if (i == lists.size() - 1) {
//                    button.setVisibility(View.VISIBLE);
//                }
//            }
//
//            @Override
//            public void onPageScrollStateChanged(int i) {
//
//            }
//        });
        pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int i, float v, int i1) {

            }

            @Override
            public void onPageSelected(int i) {
                if (i == lists.size() - 1) {
                    button.setVisibility(View.VISIBLE);
                }else {
                    button.setVisibility(View.GONE);
                }
            }

            @Override
            public void onPageScrollStateChanged(int i) {

            }
        });


        timer = new Timer();
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                handler.sendEmptyMessage(100);
            }
        }, 0, 1000);


    }
}

fragment

package com.example.exercise_four;


import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;


/**
 * A simple {@link Fragment} subclass.
 */
public class Wel_Fragment extends Fragment {


    public Wel_Fragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View inflate = inflater.inflate(R.layout.fragment_wel_, container, false);
        TextView textView = inflate.findViewById(R.id.wel_tv);
        Bundle arguments = getArguments();
        if(arguments != null){
            String msg = arguments.getString("msg");
            textView.setText(msg);
        }
        return inflate;
    }

}

注册

activity

package com.example.exercise_four;

import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import java.util.regex.Pattern;

public class Register_Activity extends AppCompatActivity {
    private static final String TAG = "Register_Activity";
    private EditText usernameReg;
    private EditText passwordReg;
    private EditText passwordAllow;
    private Button regBut;
    private ContentResolver resolver;
    private Uri uri;


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

        usernameReg = (EditText) findViewById(R.id.username_reg);
        passwordReg = (EditText) findViewById(R.id.password_reg);
        passwordAllow = (EditText) findViewById(R.id.password_allow);
        regBut = (Button) findViewById(R.id.reg_but);

        SharedPreferences wel = getSharedPreferences("wel", MODE_PRIVATE);
        SharedPreferences.Editor edit = wel.edit();
        edit.putBoolean("isWel", true);
        edit.apply();

        resolver = getContentResolver();
        uri = Uri.parse("content://com.lae.sql");


        Log.i(TAG, "onCreate: 1234");
        regBut.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                String name = usernameReg.getText().toString();
                String pwd = passwordReg.getText().toString();
                String pwd_allow = passwordAllow.getText().toString();
                String regex = "[1][3,5,6,7,8,9][0-9]{9}";
                Pattern compile = Pattern.compile(regex);
                boolean matches = compile.matcher(name).matches();

                Log.i(TAG, "onClick: 4321");
                if (matches) {
                    Log.i(TAG, "onClick: 1221");
                    if (pwd.equals(pwd_allow) &&pwd.length() >= 12 && pwd.length() <= 18) {
                        ContentValues values = new ContentValues();
                        values.put("name", name);
                        values.put("password", pwd);
                        resolver.insert(uri, values);

                        Intent intent = new Intent(Register_Activity.this, Login_Activity.class);
                        startActivity(intent);
                        finish();
                        Log.i(TAG, "onClick: 成功了");
                    } else {
                        Log.i(TAG, "onClick: 失败了");
                    }
                }
            }
        });
    }
}

package com.example.exercise_four;

import android.content.ContentResolver;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import java.util.regex.Pattern;

public class Login_Activity extends AppCompatActivity {


    private EditText username;
    private EditText password;
    private Button loginBut;
    private ContentResolver resolver;
    private Uri uri;


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

        username = (EditText) findViewById(R.id.username);
        password = (EditText) findViewById(R.id.password);
        loginBut = (Button) findViewById(R.id.login_but);

        SharedPreferences log = getSharedPreferences("log", MODE_PRIVATE);
        boolean isLog = log.getBoolean("isLog", false);
        if (isLog) {
            Intent intent = new Intent(this, MainActivity.class);
            startActivity(intent);
        }
        resolver = getContentResolver();
        uri = Uri.parse("content://com.lae.sql");

        loginBut.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                String name = username.getText().toString();
                String pwd = password.getText().toString();

                String regex = "[1][3,5,6,7,8,9][0-9]{9}";
                Pattern compile = Pattern.compile(regex);
                boolean matches = compile.matcher(name).matches();

                if (matches && pwd.length() >= 12 && pwd.length() <= 18) {
                    Cursor cursor = resolver.query(uri, null, null, null, null);
                    if (cursor != null) {
                        while (cursor.moveToNext()) {
                            String name1 = cursor.getString(cursor.getColumnIndex("name"));
                            String pwd1 = cursor.getString(cursor.getColumnIndex("password"));

                            if(name.equals(name1) && pwd.equals(pwd1)){
                                Intent intent = new Intent(Login_Activity.this, MainActivity.class);
                                startActivity(intent);
                            }

                        }
                    }
                    cursor.close();
                }

            }
        });


    }
}

主页面

activity

package com.example.exercise_four;

import android.Manifest;
import android.content.ContentResolver;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.net.Uri;
import android.provider.ContactsContract;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;

import com.example.exercise_four.javaBean.Person;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    private static final String TAG = "MainActivity";

    private ListView listView;
    private ContentResolver resolver;
    private List<Person> lists = new ArrayList<>();
    private MyAdapter adapter;

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

        listView = findViewById(R.id.listview);

        requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, 100);
        Uri uri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;

        resolver = getContentResolver();

        SharedPreferences log = getSharedPreferences("log", MODE_PRIVATE);
        SharedPreferences.Editor edit = log.edit();
        edit.putBoolean("isLog", true);
        edit.apply();

        Log.i(TAG, "onCreate: 运行到这里来");
        Cursor cursor = resolver.query(uri, null, null, null, null);
        if (cursor != null) {
            while (cursor.moveToNext()) {
                String name = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
                String number = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                Person person = new Person();
                person.setName(name);
                person.setNumber(number);
                lists.add(person);
            }
            cursor.close();
        }
        Log.i(TAG, "onCreate: 去玩儿法");

        adapter = new MyAdapter(lists, this);
        Log.i(TAG, "onCreate: 去玩儿法1");
        listView.setAdapter(adapter);
        Log.i(TAG, "onCreate: 去玩儿法2");
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//                Toast.makeText(MainActivity.this, "阿斯顿法国和接口是对方过后", Toast.LENGTH_SHORT).show();
                String number = lists.get(position).getNumber();

                Intent intent = new Intent(Intent.ACTION_DIAL);
                Uri data = Uri.parse("tel:" + number);
                intent.setData(data);
                startActivity(intent);

            }
        });

    }
}

适配器

package com.example.exercise_four;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import com.example.exercise_four.javaBean.Person;

import java.util.List;

class MyAdapter extends BaseAdapter {
    private List<Person> lists;
    private Context context;

    public MyAdapter(List<Person> lists, Context context) {
        this.lists = lists;
        this.context = context;
    }

    @Override
    public int getCount() {
        return lists.size();
    }

    @Override
    public Object getItem(int position) {
        return lists.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        if(convertView == null){
            holder = new ViewHolder();
            convertView = LayoutInflater.from(context).inflate(R.layout.layout_item,null);
            holder.textView1 = convertView.findViewById(R.id.name);
            holder.textView2 = convertView.findViewById(R.id.number);
            convertView.setTag(holder);
        }else {
            holder = (ViewHolder) convertView.getTag();
        }
        holder.textView1.setText(lists.get(position).getName());
        holder.textView2.setText(lists.get(position).getNumber());

        return convertView;
    }

    private class ViewHolder {
        private TextView textView1,textView2;

    }
}