android-改进<<仿QQ>>框架源码
该文章主要修改于CSDN某大神的一篇文章,本人觉得这篇文章的面向对象很透彻,下面分享如下可学习的几点:
Android应用经典主界面框架之一:仿QQ (使用Fragment, 附源码)
1.通过&符号实现计算优化:(后来通过问同事,说是计算机通过位运算 效率比平时的switch效率高,并讲解了该算法的原理。)
public class Constant { public static final int SIGN_FRAGMENT_MESSAGE=0x01 <<1; public static final int SIGN_FRAGMENT_CONTACTS=0x01 <<2; public static final int SIGN_FRAGMENT_NEWS=0x01 <<3; public static final int SIGN_FRAGMENT_SETTENGS=0x01 <<4; }
@Override public void onClickCallBack(int itemID) { String tag = ""; if ((itemID & Constant.SIGN_FRAGMENT_MESSAGE) != 0) { tag = Constant.STR_FRAGMENT_MESSAGE; } else if ((itemID & Constant.SIGN_FRAGMENT_CONTACTS) != 0) { tag = Constant.STR_FRAGMENT_CONTACTS; } else if ((itemID & Constant.SIGN_FRAGMENT_NEWS) != 0) { tag = Constant.STR_FRAGMENT_NEWS; } else if ((itemID & Constant.SIGN_FRAGMENT_SETTENGS) != 0) { tag = Constant.STR_FRAGMENT_SETTINGS; } mHeaderPanelLayout.setText(tag); setTabSection(tag); }
2.通过onLayout对底部栏中间的按钮进行“动态”调整
@Override protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); layoutItem(l, t, r, b); } private void layoutItem(int left, int top, int right, int bottom) { int allChildWidth=0; int num=getChildCount(); for (int i = 0; i < num; i++) { allChildWidth+=getChildAt(i).getWidth(); } int absoluteWidth=right-left-getPaddingLeft()-getPaddingRight(); int blankWidth=(absoluteWidth-allChildWidth)/(num-1); //设置第2 3个按钮的间距 LayoutParams params1=(LayoutParams) mContactsBtn.getLayoutParams(); params1.leftMargin=blankWidth; mContactsBtn.setLayoutParams(params1); LayoutParams params2=(LayoutParams) mNewsBtn.getLayoutParams(); params2.leftMargin=blankWidth; mNewsBtn.setLayoutParams(params2); }
3.两种实例化布局的应用:
1)通过layoutInflater.
public ImageText(Context context, AttributeSet attrs) { super(context, attrs); LayoutInflater.from(context).inflate(R.layout.image_text_layout, this,true); mImageView=(ImageView) findViewById(R.id.iv_imgae_text); mTextiew=(TextView) findViewById(R.id.tv_imgae_text); }
2)通过onFinishInflater()
<?xml version="1.0" encoding="utf-8"?> <org.lean.ui.BottomPanelLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#FFF3F3F3" android:paddingLeft="20dp" android:paddingRight="20dp" android:layout_alignParentBottom="true" > <org.lean.ui.ImageText android:id="@+id/message_btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" /> <org.lean.ui.ImageText android:id="@+id/contacts_btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_toRightOf="@id/message_btn" /> <org.lean.ui.ImageText android:id="@+id/news_btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_toRightOf="@id/contacts_btn" /> <org.lean.ui.ImageText android:id="@+id/settings_btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" /> </org.lean.ui.BottomPanelLayout>
@Override protected void onFinishInflate() { super.onFinishInflate(); mMessageBtn=(ImageText) findViewById(R.id.message_btn); mContactsBtn=(ImageText) findViewById(R.id.contacts_btn); mNewsBtn=(ImageText) findViewById(R.id.news_btn); mSettingsBtn=(ImageText) findViewById(R.id.settings_btn); initClickEvent(); }
4.代理实现数据传递(IOS中最常用的一种设计模式)
public class BottomPanelLayout extends RelativeLayout implements OnClickListener{ private BottomPanelCallBackProtocal mCallBackProtocal; //代理协议 public void setCallBackProtocal(BottomPanelCallBackProtocal callBackProtocal) { this.mCallBackProtocal = callBackProtocal; } public interface BottomPanelCallBackProtocal{ public void onClickCallBack(int itemID); } /** * 1.修改本身样式 * 2.对外声明事件 */ @Override public void onClick(View v) { initBottomPanel(); int index=-1; switch (v.getId()) { case R.id.message_btn: index=Constant.SIGN_FRAGMENT_MESSAGE; mMessageBtn.setChecked(index); break; case R.id.contacts_btn: index=Constant.SIGN_FRAGMENT_CONTACTS; mContactsBtn.setChecked(index); break; case R.id.news_btn: index=Constant.SIGN_FRAGMENT_NEWS; mNewsBtn.setChecked(index); break; case R.id.settings_btn: index=Constant.SIGN_FRAGMENT_SETTENGS; mSettingsBtn.setChecked(index); break; default: break; } if (mCallBackProtocal!=null) { mCallBackProtocal.onClickCallBack(index); } } }
public class MainActivity extends Activity implements BottomPanelCallBackProtocal { @Override public void onClickCallBack(int itemID) { String tag = ""; if ((itemID & Constant.SIGN_FRAGMENT_MESSAGE) != 0) { tag = Constant.STR_FRAGMENT_MESSAGE; } else if ((itemID & Constant.SIGN_FRAGMENT_CONTACTS) != 0) { tag = Constant.STR_FRAGMENT_CONTACTS; } else if ((itemID & Constant.SIGN_FRAGMENT_NEWS) != 0) { tag = Constant.STR_FRAGMENT_NEWS; } else if ((itemID & Constant.SIGN_FRAGMENT_SETTENGS) != 0) { tag = Constant.STR_FRAGMENT_SETTINGS; } mHeaderPanelLayout.setText(tag); setTabSection(tag); } }
5.修改原来Fragment跳转的代码(之前方法ensureTransaction()是在粘贴或者消除的时候都要判断,但作为一个事务,只需要保证事物只有一个开始即可,而不需要每次都调用)
private void setTabSection(String tag) { if (TextUtils.equals(tag, currFagTag)) { return; } ensureTransaction(); if (currFagTag != null && !currFagTag.equals("")) { detachFragment(getFragment(currFagTag)); } attachFragment(R.id.fragment_panel, getFragment(tag), tag); commitTransaction(); }
private void ensureTransaction() { if (mFragmentTransaction == null) { mFragmentTransaction = mFragmentManager.beginTransaction(); mFragmentTransaction .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE); } }
6.Fragment对Fragment进行跳转并传值的改进。(这里试验从MessageFragment 点击textview跳转到 ContactFragment );
1>在MessageFragment 中
@Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); getActivity().findViewById(R.id.msg_tv).setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { ((MainActivity)getActivity()).setTabSection(Constant.STR_FRAGMENT_CONTACTS); } }); }
2>在ContactFragment 中声明数据代理
//声明一个变量,该变量存储该Fragment所需要的一切参数 当刷新View时手动调用其更新数据 private ContactFragmentCallBack mContactFragmentCallBack; //声明该接口 public interface ContactFragmentCallBack{ //说明该Fragment更新时需要一个String对象 public String getContentStr(); }3>MessageFragment 实现该代理
public class MessageFragment extends BaseFragment implements ContactFragmentCallBack{ @Override public String getContentStr() { return "abc"; } }
4>在ContactFragment 中回调
@Override public void onResume() { super.onResume(); MainActivity.currFagTag=Constant.STR_FRAGMENT_CONTACTS; //通过取出 存储于上个Fragment中的数据 Fragment f=((MainActivity)getActivity()).getFragment(Constant.STR_FRAGMENT_MESSAGE); if (f!=null&&f instanceof ContactFragmentCallBack) { mContactFragmentCallBack=(ContactFragmentCallBack)f; TextView textView=(TextView) ((MainActivity)getActivity()).findViewById(R.id.contact_tv); textView.setText(mContactFragmentCallBack.getContentStr()); } }
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