日期选择器在AVD Android 2.2 API 8中不起作用

Question

我使用了来自http://developer.android.com/guide/topics/ui/controls/pickers.html的示例Date Picker，当AVD设置如下所示时，它运行正常

目标平台4.22和API Level 17。但是，当我使用下面的AVD设置测试相同的代码时，它崩溃了

目标平台2.2和API Level 8

我的代码如下所示

MainActivity.java

package com.example.datepicker;

import android.os.Build;
import android.os.Bundle;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.DialogFragment;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
import android.view.View;

@SuppressLint("NewApi")
public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
                
    }
    
    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    @SuppressLint("NewApi")
    public void showTimePickerDialog(View v) {
        DialogFragment newFragment = new ShowCalendar();
        newFragment.show(getFragmentManager(), "datePicker");
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

ShowCalendar.java

package com.example.datepicker;

import java.util.Calendar;
import android.annotation.SuppressLint;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.widget.DatePicker;

@SuppressLint("NewApi")
public class ShowCalendar extends DialogFragment
implements DatePickerDialog.OnDateSetListener {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current date as the default date in the picker
        final Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);

        // Create a new instance of DatePickerDialog and return it
        return new DatePickerDialog(getActivity(), this, year, month, day);
    }

    public void onDateSet(DatePicker view, int year, int month, int day) {
        // Do something with the date chosen by the user
    }
    
}   

请注意，正如示例中所暗示的那样，我使用treid将MainActivity.java中的Activity类替换为FragmentActivity类。但仍然是同一个问题。我哪里错了？

Answer 1

导入

import android.support.v4.app.DialogFragment;

而不是

import android.app.DialogFragment;

如果要使用API11以下的Fragment，则需要导入提供向后兼容性的android.support.v4.app

Answer 2

使用以下步骤-

1.更改活动以扩展FragmentActivity类

2.将对getFragmentManager()方法的调用更改为getSupportFragmentManager()方法

3.组织或更新导入

来源-

http://mobile.tutsplus.com/tutorials/android/android-compatibility-working-with-fragments/