单击主页按钮时未调用onActivityResult

Question

I have three activity like this :
+ LoginPage : display only one time when app installed
+ MainActivity : Home screen of app
+ TextNoteActivity: Sub activity is called by startActivityForResult from MainActivity

I don't know why when i click up home button from TextNoteActivity. The app will close. The following is my code.

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.lilprogramming.bossnote">

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity
        android:name="activity.MainActivity"
        android:label="@string/app_name"
        android:theme="@style/AppTheme.NoActionBar"
        >
    </activity>

    <activity
        android:name="activity.LoginPage"
        android:label="@string/app_name"
        android:noHistory="true"
        android:theme="@style/Theme.AppCompat.Light.NoActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />

        </intent-filter>
    </activity>

    <activity android:name="activity.TextNoteActivity"
        android:parentActivityName="activity.MainActivity"
        >
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value="activity.MainActivity" />
    </activity>

    <activity
        android:name="activity.AddTagActivity"
        android:label="@string/title_activity_add_tag"
        android:theme="@style/AppTheme">

    </activity>

</application>

In MainActivity :

Intent i = new Intent(this, TextNoteActivity.class);
startActivityForResult(i, REQUEST_ADDTEXTNOTE);

In TextNoteActivity :

    toolbar = (Toolbar) findViewById(R.id.addTextNote_toolbar);
    toolbar.setTitle("");
    setSupportActionBar(toolbar);

    toolbar.setNavigationOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            addTextNote();
            Toast.makeText(TextNoteActivity.this, "Back then", Toast.LENGTH_SHORT).show();
            finish();
        }
    });

Update

   private void addTextNote() {
    String title = etTitle.getText().toString();
    String content = etContent.getText().toString();

    if (!title.isEmpty() &&  !content.isEmpty()) {
        TextNote textNote = new TextNote(title, 0, content);
        database.addTextNote(textNote, null);
        setResult(RESULT_OK);
    }
    else {
        setResult(Activity.RESULT_CANCELED);
    }

}

Answer 1

That is expected behavior
There is no reason for your activity to return a result when the user pushes the Home button.
If you need to catch the Home button event
You could override onPause() and finish() the activity.

DISCLAIMER
But I'm afraid this is not a good app-behavior
Because the user won't expect the app state to change when he pushes the Home button.