12.4 挑战练习：更多对话框
1）Crime里面增加存储小时和分钟的变量
private int mHour;
private int mMinute;
并通过右键generate添加getter和setter方法
（2）创建dialog_time.xml文件
<?xml version="1.0" encoding="utf-8"?>
<TimePicker xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/dialog_time_picker"
android:layout_width="match_parent"
android:layout_height="match_parent">
</TimePicker>
（3）创建TimePickerFragment.java
public class TimePickerFragment extends DialogFragment {
public static final String EXTRA_HOUR =
"om.example.lab.android.nuc.criminallntent.hour";
public static final String EXTRA_MINUTE =
"om.example.lab.android.nuc.criminallntent.minute";
public static final String ARG_Hour = "hour";
public static final String ARG_Minute = "minute";
private TimePicker timePicker;
public static TimePickerFragment newInstance(int hour,int minute){
Bundle arge = new Bundle( );
arge.putSerializable(ARG_Hour,hour);
arge.putSerializable( ARG_Minute,minute );
TimePickerFragment fragment = new TimePickerFragment();
fragment.setArguments( arge );
return fragment;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
//转换成小时跟分钟
int hour = (int) getArguments().getSerializable( ARG_Hour );
int minute = (int) getArguments().getSerializable( ARG_Minute );
View view = LayoutInflater.from( getActivity() ).inflate( R.layout.dialog_time,null);
//找到布局控件
timePicker = (TimePicker) view.findViewById( R.id.dialog_time_picker);
timePicker.setCurrentHour( hour );
timePicker.setCurrentMinute( minute );
return new AlertDialog.Builder(getActivity())
.setView( view )
.setTitle( "Time of Crime" )
.setPositiveButton( android.R.string.ok, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
int hour = timePicker.getCurrentHour();
int minute = timePicker.getCurrentMinute();
sendResult( Activity.RESULT_OK,hour,minute );
}
} )
.create();
}
private void sendResult(int resultCode,int hour,int minute){
if (getTargetFragment() == null){
return;
}
Intent intent = new Intent( );
intent.putExtra( EXTRA_HOUR ,hour);
intent.putExtra( EXTRA_MINUTE,minute);
getTargetFragment()
.onActivityResult( getTargetRequestCode(),resultCode,intent );
}
}
（4）在fragment_crime.xml新增一个button用于显示timepicker
<Button
android:id="@+id/crime_time"
android:text="@string/time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:background="@drawable/bt_selector"/>
（5）在CrimeFragment.java中，onCreateView方法增加对新button的处理
mTimeButton = (Button) v.findViewById( R.id.crime_time );
mTimeButton.setOnClickListener( new View.OnClickListener() {
@Override
public void onClick(View v) {
FragmentManager fragmentManager = getFragmentManager();
TimePickerFragment dialog = TimePickerFragment.newInstance( mCrime.getHour(),mCrime.getMinute());
dialog.setTargetFragment( CrimeFragment.this,REQUEST_TIME);
dialog.show(fragmentManager,DIALOG_DATE );
}
} );
增加updateTime()方法，实现具体时间的正确显示；修改onActivityResult方法，增加对具体时间返回值的处理
if (requestCode == REQUEST_TIME){
int hour = (int) data.getSerializableExtra( TimePickerFragment.EXTRA_HOUR );
int minute = (int) data.getSerializableExtra( TimePickerFragment.EXTRA_MINUTE );
mCrime.setHour( hour );
mCrime.setMinute( minute );
updateTime();
}
if (requestCode == REQUEST_DATE){
//覆盖onActivityResult()方法从extra中获取日期数据，
Date date = (Date) data.getSerializableExtra(DatePickerFragment.EXTRA_DATE);
//设置对应的Crimed的记录日期
mCrime.setDate(date);
updateCrime();
//更新Button所显示的信息
updateDate();
}else if (requestCode == REQUEST_CNTACT && data != null){
//获取日期的Uri
Uri contactUri = data.getData();
//创建了一条查询语句，要球返回全部联系人的姓名
//然后查询数据库
String[] queryFields = new String[]{
ContactsContract.Contacts.DISPLAY_NAME,
//记住这个是最重要的，别忘了
ContactsContract.Contacts._ID
};
Cursor c = getActivity().getContentResolver().
query(contactUri,queryFields,null,null,null);
try{
if (c.getCount() == 0) {
return;
}
c.moveToFirst();
//获取联系人的姓名
String suspect = c.getString(0);
// String Photonumber = c.getString( 1 );
mCrime.setSuspect(suspect);
updateCrime();
// mCrime.setPhotoNumber( Photonumber );
mSuspectButton.setText(suspect);
String _id = c.getString( 1 );
SuspectContactId = _id;
}finally {
//关闭查询
c.close();
}
/*
挑战练习 添加拨号
*/
Cursor cursor_1 = getActivity().getContentResolver()
.query( ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?",
new String[]{SuspectContactId},
null);
try{
if (cursor_1.getCount() == 0){
return;
}
cursor_1.moveToFirst();
int index = cursor_1.getColumnIndex( ContactsContract.CommonDataKinds.Phone.NUMBER );
String number = cursor_1.getString( index );
mCrime.setSuspectcontact( number );
callSusoectButton.setEnabled( true );
callSusoectButton.setText( number );
}finally {
cursor_1.close();
}
}else if (requestCode == REQUEST_PHOTO){
// updatePhotoView();
updateCrime();
/**
* 优化略缩图加载
*/
updatePhotoView( mPhotoView.getWidth(),mPhotoView.getHeight() );
}
}
private void updateDate() {
// mDataButton.setText(mCrime.getDate().toString());
/**
* 第八章挑战练习
*/
String date = (String) DateFormat.format("EEEE, MMM dd, yyyy", mCrime.getDate());
mDataButton.setText( date );
}
@SuppressLint("SetTextI18n")
private void updateTime() {
if (mCrime.getMinute() < 10){
mTimeButton.setText( mCrime.getHour() + " : 0" + mCrime.getMinute() );
}else {
mTimeButton.setText( mCrime.getHour() + " : " + mCrime.getMinute() );
}
}
效果演示：
CrimeFragment
TimePicker
