《Android编程权威指南（第三版）》第十五章挑战练习Demo

《Android编程权威指南（第三版）》第十五章挑战练习Demo

第一题，使用IntentBuilder创建Intent，关键代码：

mReportButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                /**
                Intent i = new Intent(Intent.ACTION_SEND);
                i.setType("text/plan");
                i.putExtra(Intent.EXTRA_TEXT, getCrimeReport());
                i.putExtra(Intent.EXTRA_SUBJECT, getString(R.string.crime_report_subject));
                i = Intent.createChooser(i, getString(R.string.send_report));
                 */
                ShareCompat.IntentBuilder i = ShareCompat.IntentBuilder.from(getActivity())
                        .setType("text/plan")
                        .setText(getCrimeReport())
                        .setSubject(getString(R.string.crime_report_subject))
                        .setSubject(getString(R.string.send_report));
                i.createChooserIntent();
                i.startChooser();
            }
        });

第二题，添加联系电话：

先在Crime类中加一个电话号码变量：

public class Crime {

    private UUID mId;
    private String mTitle;
    private Date mDate;
    private boolean mSolved;
    private String mSuspect;
    private String mPhone;

    public Crime() {
        this(UUID.randomUUID());
    }

    public Crime(UUID id) {
        mId = id;
        mDate = new Date();
    }

    public UUID getId() {
        return mId;
    }

    public String getTitle() {
        return mTitle;
    }

    public Date getDate() {
        return mDate;
    }

    public boolean isSolved() {
        return mSolved;
    }

    public void setTitle(String title) {
        mTitle = title;
    }

    public void setDate(Date date) {
        mDate = date;
    }

    public void setSolved(boolean solved) {
        mSolved = solved;
    }

    public String getSuspect() {
        return mSuspect;
    }

    public void setSuspect(String suspect) {
        mSuspect = suspect;
    }

    public String getPhone() {
        return mPhone;
    }

    public void setPhone(String phone) {
        this.mPhone = phone;
    }
}

再在数据库中加一列：

public class CrimeDbSchema {

    public static final class CrimeTable {

        public static final String NAME = "crimes";

        public static final class Cols {
            public static final String UUID = "uuid";
            public static final String TITLE = "title";
            public static final String DATE = "date";
            public static final String SOLVED = "solved";
            public static final String SUSPECT = "suspect";
            public static final String PHONE = "phone";
        }

    }

}

更改CrimeCursorWrapper和CrimeBaseHelper：

public class CrimeCursorWrapper extends CursorWrapper {

    public CrimeCursorWrapper(Cursor cursor) {
        super(cursor);
    }

    public Crime getCrime() {
        String uuidString = getString(getColumnIndex(CrimeTable.Cols.UUID));
        String title = getString(getColumnIndex(CrimeTable.Cols.TITLE));
        long date = getLong(getColumnIndex(CrimeTable.Cols.DATE));
        int isSolved = getInt(getColumnIndex(CrimeTable.Cols.SOLVED));
        String suspect = getString(getColumnIndex(CrimeTable.Cols.SUSPECT));
        String phone = getString(getColumnIndex(CrimeTable.Cols.PHONE));

        Crime crime = new Crime(UUID.fromString(uuidString));
        crime.setTitle(title);
        crime.setDate(new Date(date));
        crime.setSolved(isSolved != 0);
        crime.setSuspect(suspect);
        crime.setPhone(phone);

        return crime;
    }

}

public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table " + CrimeTable.NAME + "(" +
                "_id integer primary key autoincrement, " +
                CrimeTable.Cols.UUID + ", "+
                CrimeTable.Cols.TITLE + ", " +
                CrimeTable.Cols.DATE + ", " +
                CrimeTable.Cols.SOLVED + ", " +
                CrimeTable.Cols.SUSPECT + ", " +
                CrimeTable.Cols.PHONE +
                ")"
        );
    }

最后在CrimeFragment中更改onActivityResult()：

public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode != Activity.RESULT_OK) {
            return;
        }
        if (requestCode == REQUEST_DATE) {
            Date date = (Date) data.getSerializableExtra(DatePickerFragment.EXTRA_DATE);
            mCrime.setDate(date);
            updateDate();
        } else if (requestCode == REQUEST_CONTACT && data != null) {
            Uri contactUri = data.getData();
            String[] queryFields = new String[] {
                    ContactsContract.Contacts.DISPLAY_NAME, ContactsContract.Contacts._ID
            };
            Cursor c = getActivity().getContentResolver().query(contactUri, queryFields,
                    null, null, null);
            try {
                if (c.getCount() == 0) {
                    return;
                }
                c.moveToFirst();
                String suspect = c.getString(0);
                String memId = c.getString(1);
                Cursor phone = getActivity().getContentResolver().query(
                        ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                        null,
                        ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = " + memId,
                        null,
                        null);
                if (phone.moveToNext()) {
                    //取出联系人电话。
                    String mPhoneNumber = phone.getString(
                            phone.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                    //给当前的Crime对象设置电话号码
                    mCrime.setPhone(mPhoneNumber);
                }
                mCrime.setSuspect(suspect);
                mSuspectButton.setText(suspect);
            } finally {
                c.close();
            }
        }
    }

第二题在查阅文档时看了一些其他大佬的文档，发现他们的写的更详细，我把链接放在下面：

（1）https://www.cnblogs.com/android-for-dh/p/4449524.html

（2）http://www.bubuko.com/infodetail-2173183.html

最后附上本题源码：Demo

若有不足，敬请指教 ：)