android软件开发：类似微信的简单软件程序，包含聊天界面，播放音乐界面，联系人界面以及相册界面

以下是一个类似微信的简单软件的Android应用程序的示例代码，包含聊天界面、播放音乐界面、联系人界面以及相册界面。

activity_main.xml布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Button
        android:id="@+id/chatBtn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="聊天" />

    <Button
        android:id="@+id/musicBtn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="播放音乐" />

    <Button
        android:id="@+id/contactBtn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="联系人" />

    <Button
        android:id="@+id/galleryBtn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="相册" />

</LinearLayout>

ChatActivity.java代码文件：

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

import java.util.ArrayList;

public class ChatActivity extends AppCompatActivity {

    private ArrayList<String> messagesList = new ArrayList<>();
    private ListView messageListView;
    private EditText messageEditText;
    private Button sendButton;

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

        messageListView = findViewById(R.id.messageListView);
        messageEditText = findViewById(R.id.messageEditText);
        sendButton = findViewById(R.id.sendButton);

        final MessageAdapter adapter = new MessageAdapter(this, messagesList);
        messageListView.setAdapter(adapter);

        sendButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String message = messageEditText.getText().toString();
                if (message.isEmpty()) {
                    Toast.makeText(ChatActivity.this, "请输入消息", Toast.LENGTH_SHORT).show();
                    return;
                }
                messagesList.add(message);
                adapter.notifyDataSetChanged();
                messageEditText.setText("");
            }
        });
    }
}

MusicActivity.java代码文件：

import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

public class MusicActivity extends AppCompatActivity {

    private MediaPlayer mediaPlayer;

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

        mediaPlayer = MediaPlayer.create(this, R.raw.sample_music);
        Button playButton = findViewById(R.id.playButton);
        Button pauseButton = findViewById(R.id.pauseButton);

        playButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!mediaPlayer.isPlaying()) {
                    mediaPlayer.start();
                } else {
                    Toast.makeText(MusicActivity.this, "音乐正在播放", Toast.LENGTH_SHORT).show();
                }
            }
        });

        pauseButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mediaPlayer.isPlaying()) {
                    mediaPlayer.pause();
                } else {
                    Toast.makeText(MusicActivity.this, "音乐已暂停", Toast.LENGTH_SHORT).show();
                }
            }
        });
    }

    @Override
    protected void onStop() {
        super.onStop();
        mediaPlayer.release();
    }
}

ContactActivity.java代码文件：

import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import androidx.appcompat.app.AppCompatActivity;

import java.util.ArrayList;

public class ContactActivity extends AppCompatActivity {

    private ArrayList<String> contactList = new ArrayList<>();

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

        contactList.add("张三");
        contactList.add("李四");
        contactList.add("王五");

        ListView contactListView = findViewById(R.id.contactListView);
        ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, contactList);
        contactListView.setAdapter(adapter);
    }
}

GalleryActivity.java代码文件：

import android.Manifest;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.MediaStore;
import android.widget.GridView;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import java.util.ArrayList;

public class GalleryActivity extends AppCompatActivity {

    private static final int PERMISSION_REQUEST_CODE = 1;
    private ArrayList<String> imageList = new ArrayList<>();

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

        if (ContextCompat.checkSelfPermission(GalleryActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(GalleryActivity.this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, PERMISSION_REQUEST_CODE);
        } else {
            loadImages();
        }
    }

    private void loadImages() {
        String[] projection = {MediaStore.Images.Media.DATA};
        Cursor cursor = getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, projection, null, null, null);
        if (cursor != null) {
            while (cursor.moveToNext()) {
                String imagePath = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA));
                imageList.add(imagePath);
            }
            cursor.close();
        }

        GridView gridView = findViewById(R.id.gridView);
        ImageAdapter adapter = new ImageAdapter(this, imageList);
        gridView.setAdapter(adapter);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        if (requestCode == PERMISSION_REQUEST_CODE) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                loadImages();
            }
        }
    }
}

在这个示例中，我们使用了ListView、MediaPlayer、ArrayAdapter和GridView等Android控件和API来实现聊天界面、播放音乐界面、联系人界面以及相册界面。这个简单的示例可能需要根据您的具体需求进行更改和扩展。