基于安卓，点击状态栏图标，查询笔记内容的代码

你可以尝试以下代码：

1. 在 AndroidManifest.xml 中添加权限：

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

2. 在 MainActivity.java 中添加以下代码：

public class MainActivity extends AppCompatActivity {
    private static final int REQUEST_CODE_NOTE = 1;
    private static final String NOTE_MIME_TYPE = "text/plain";

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

        // 设置状态栏图标点击事件
        NotificationManager notificationManager = getSystemService(NotificationManager.class);
        NotificationChannel channel = new NotificationChannel("note", "Note", NotificationManager.IMPORTANCE_DEFAULT);
        notificationManager.createNotificationChannel(channel);
        Notification notification = new NotificationCompat.Builder(this, "note")
                .setSmallIcon(R.drawable.ic_launcher_foreground)
                .setContentTitle("Search note")
                .setContentText("Click to search note")
                .setPriority(NotificationCompat.PRIORITY_DEFAULT)
                .setAutoCancel(true)
                .setContentIntent(getNoteSearchPendingIntent())
                .build();
        notificationManager.notify(1, notification);
    }

    private PendingIntent getNoteSearchPendingIntent() {
        Intent intent = new Intent(Intent.ACTION_SEARCH);
        intent.setType(NOTE_MIME_TYPE);
        intent.putExtra(SearchManager.QUERY, "");
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        return PendingIntent.getActivity(this, REQUEST_CODE_NOTE, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    }
}

3. 在 AndroidManifest.xml 中添加以下代码：

<activity android:name=".MainActivity">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
    <intent-filter>
        <action android:name="android.intent.action.SEARCH" />
        <category android:name="android.intent.category.DEFAULT" />
        <data android:mimeType="text/plain" />
    </intent-filter>
</activity>

4. 在笔记应用中添加以下代码：

public class NoteActivity extends AppCompatActivity {
    private EditText mEditText;

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

        mEditText = findViewById(R.id.edit_text);

        // 将笔记内容保存到文件中
        File file = new File(getExternalFilesDir(null), "note.txt");
        try {
            FileOutputStream outputStream = new FileOutputStream(file);
            outputStream.write(mEditText.getText().toString().getBytes());
            outputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

5. 在 AndroidManifest.xml 中添加以下代码：

<activity android:name=".NoteActivity">
    <intent-filter>
        <action android:name="android.intent.action.VIEW" />
        <category android:name="android.intent.category.DEFAULT" />
        <data android:mimeType="text/plain" />
    </intent-filter>
</activity>

现在你可以在状态栏中点击图标，然后输入笔记内容进行搜索了。