onActivityResult（）未调用

Question

清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="qu.clock">
<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".MainActivity2">
        <intent-filter>
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>
</application>

mainclass：

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

private ImageView ClockButton;

private LinearLayout linearLayout;
private TextView[] textViews;
private int hours;
private int minutes;

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


    textViews=new TextView[20];

    linearLayout=(LinearLayout)findViewById(R.id.LinearLayout1);

    ClockButton=(ImageView)findViewById(R.id.ClockIconButton);
    ClockButton.setOnClickListener(this);

}

public void onChangeContentView()
{
    Intent intent = new Intent(this, MainActivity2.class);
    startActivityForResult(intent,2);
}

@Override
public void onClick(View v) {
    onChangeContentView();
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    Toast.makeText(getApplicationContext(),"test",Toast.LENGTH_SHORT).show();//test
    hours=Integer.parseInt(data.getStringExtra("H"));
    minutes=Integer.parseInt(data.getStringExtra("M"));

    for(int i=0;i<textViews.length;i++)
    {
        if(textViews[i]==null)
        {
            textViews[i].setText(hours+" : "+minutes);
            linearLayout.addView(textViews[i]);

            break;
        }
    }
}
}

子类：

public class MainActivity2 extends AppCompatActivity implements View.OnClickListener {

private ImageView OkButton;
private TimePicker timePicker;
private int hours;
private int minutes;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);
    OkButton = (ImageView) findViewById(R.id.OkIcon);
    OkButton.setOnClickListener(this);
    timePicker = (TimePicker) findViewById(R.id.TimePicker1);
}


@Override
public void onClick(View v) {

    hours = timePicker.getCurrentHour();
    minutes = timePicker.getCurrentMinute();
    Intent intent = new Intent();
    intent.putExtra("H", hours);
    intent.putExtra("M", minutes);
    setResult(RESULT_OK,intent);

    finish();
}
}

我仍然坚持要解决这些问题 我昨天已经让它知道了 但他们没有帮助我 我该怎么办？

我还尝试将android:launchmode=""和android:nohistory="false"放入清单。