深刻進修Java編程中的字符串的進階應用。本站提示廣大學習愛好者：（深刻進修Java編程中的字符串的進階應用）文章只能為提供參考，不一定能成為您想要的結果。以下是深刻進修Java編程中的字符串的進階應用正文
自界說view年夜概可以分紅：
比來又跟同窗聊起來了，因而就預備本身完成一個imagebutton來練練手。（最簡略的了）和前面一個把imageview與textview聯合應用的案例。
ImageButton
要完成ImageButton最輕易想到的不就是把button和imageview合在一路麼。嗯，人輕易就想到這是一個組合自界說view。可是若何把一個image放到button上呢，天然就是用一個FrameLayout把button和imageview包裹起來，然後將這個layout看成一個weidgt。把一個layout當做一個控件我開端不太懂得。後來懂得到一些器械。
彌補常識點（安卓的頂層視圖）
在android外面，你的app界面的運動的視圖並不是是最頂級的視圖。年夜家應當都曉得viewtree。在安卓外面，最頂級的視圖是一個叫DecorView的器械。它包含你的狀況欄，題目欄，和你的運動界面。並且這個運動界面，安卓會主動幫你提早弄出來一個FrameLayout。可以這麼懂得吧，在安卓這個天主的眼前，你的activity就是放在他的framelayout的一個個view。上一張圖～
DecorView->LinearLayout(狀況欄和activity)->FrameLayout(activity)->你本身的acitivty視圖。
實例講授
好啦，回歸正題。我上代碼了。
myimagebutton_layout.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/button_imagebutton" /> <ImageView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/imageview_button" /> </FrameLayout>
用一個framelayout把兩個控件裝起來，然後組合。組合了以後我們就去自界說我們這個控件的屬性。button不消變對吧，用原生的就行了，就是須要有一個圖片的src這個屬性就行了。
在values目次下的attrs.xml文件_
<?xml version="1.0" encoding="utf-8"?>
<resources>在
<declare-styleable name="MyImageButton">
<attr name="Imagesrc" format="reference"/>
</declare-styleable>
</resources>
普通來講，declare-styleable標簽的名字都是你的自界說控件的名字。attr就是你的自界說控件屬性。format是這個屬性的值的數據類型。這裡的reference表現援用。dimension表現的是dp或許sp的年夜小。還有一些可以本身去看看。界說好屬性，我們就開端寫控件了。
MyImageButton.java
public class MyImageButton2 extends FrameLayout{
ImageView mImageView;
Button mButton;
int resId;
public MyImageButton2(Context context) {
super(context);
}
public MyImageButton2(Context context, AttributeSet attrs) {
super(context, attrs);
//導入結構
LayoutInflater.from(context).inflate(R.layout.myimagebutton_layout, this);
mImageView＝(ImageView)findViewById(R.id.imageview_button);
mButton = (Button) findViewById(R.id.button_imagebutton);
//取得這個控件對應的屬性。
TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.MyImageButton);
try{
//取得屬性值
resId = a.getResourceId(R.styleable.MyImageButton_Imagesrc, 0);
}finally {
//收受接管這個對象
a.recycle();
}
if(resId != 0){
mImageView.setImageResource(resId);
}
}
public void setImage(int resId){
mImageView.setImageResource(resId);
}
}
普通來講，繼續view（就這麼說吧，橫豎都是都是繼續view的），完成兩三個結構函數便可以了。在第二個外面有一個attr，這就是傳出去的屬性。假如resId不為默許值，就表現用戶在xml外面傳入了這個屬性值，你也必需要寫一個set辦法，讓用戶可以在java代碼中去轉變屬性值。
test.myimagebutton.layout.xml_
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.example.think.testview.customview.MyImageButton2
xmlns:pt = "http://schemas.android.com/apk/res/com.example.think.testview"
android:layout_height="100dp"
android:layout_width="match_parent"
pt:Imagesrc = "@drawable/ic_launcher"
/>
</LinearLayout>
後果圖
另外一個實例
這裡我們來看一個view組合控件的例子：
<string-array name="bao_type"> <item>測試1</item> <item>測試2</item> <item>測試3</item> <item>測試4</item> </string-array>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/gray_common_background"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="@+id/txt_viewpage_bar1"
android:textColor="@color/theme_red" />
<TextView
android:id="@+id/txt_viewpage_bar2"
/>
<TextView
android:id="@+id/txt_viewpage_bar3"
/>
<TextView
android:id="@+id/txt_viewpage_bar4"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<View
android:id="@+id/view_viewpage_bar1"
/>
<View
android:id="@+id/view_viewpage_bar2"
/>
<View
android:id="@+id/view_viewpage_bar3"
/>
<View
android:id="@+id/view_viewpage_bar4"
/>
</LinearLayout>
<android.support.v4.view.ViewPager
android:id="@+id/common_viewpage_buttom"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
public interface SlbPageViewOnPageChangeListener {
void onPageSelected(int position);
void onPageScrollStateChanged(int state);
}
public class SlbPageViewBar extends LinearLayout {
private TextView[] mTotalTxtViews;
private View[] mTotalViews;
private List<TextView> mTxtViews;
private List<View> mViews;
private ViewPager mViewPager;
private SlbPageViewOnPageChangeListener mSlbPageViewOnPageChangeListener;
public SlbPageViewBar(Context context, AttributeSet attrs) {
super(context, attrs);
mTotalTxtViews = new TextView[4];
mTotalViews = new View[4];
mTxtViews = new ArrayList<>();
mViews = new ArrayList<>();
initView();
}
private void initView() {
View.inflate(getContext(), R.layout.layout_common_top_pageview_bar, this);
mViewPager = (ViewPager) findViewById(R.id.common_viewpage_buttom);
mTotalTxtViews[0] = (TextView) findViewById(R.id.txt_viewpage_bar1);
mTotalTxtViews[1] = (TextView) findViewById(R.id.txt_viewpage_bar2);
mTotalTxtViews[2] = (TextView) findViewById(R.id.txt_viewpage_bar3);
mTotalTxtViews[3] = (TextView) findViewById(R.id.txt_viewpage_bar4);
mTotalViews[0] = findViewById(R.id.view_viewpage_bar1);
mTotalViews[1] = findViewById(R.id.view_viewpage_bar2);
mTotalViews[2] = findViewById(R.id.view_viewpage_bar3);
mTotalViews[3] = findViewById(R.id.view_viewpage_bar4);
}
/**
* @param title 題目稱號數組
*/
public void setTitleView(String[] title) {
int legth = title.length > 4 ? 4 : title.length;
for (int i = 0; i < legth; i++) {
mTotalTxtViews[i].setText(title[i]);
mTotalTxtViews[i].setVisibility(View.VISIBLE);
mTotalViews[i].setVisibility(View.INVISIBLE);
mTotalTxtViews[i].setOnClickListener(new SlbTextViewOnLister(i));
mTxtViews.add(mTotalTxtViews[i]);
mViews.add(mTotalViews[i]);
}
mTotalViews[0].setVisibility(View.VISIBLE);
mViewPager.setOnPageChangeListener(mOnButtomPageChangeListener);
}
public ViewPager getViewPager(){
return mViewPager;
}
public void setSlbPageViewOnPageChangeListener(SlbPageViewOnPageChangeListener slbPageViewOnPageChangeListener) {
this.mSlbPageViewOnPageChangeListener = slbPageViewOnPageChangeListener;
}
private void changeViewBg(int textViewId, int viewId) {
for (View view : mViews) {
if (viewId == view.getId()) {
view.setVisibility(View.VISIBLE);
} else {
view.setVisibility(View.INVISIBLE);
}
}
for (TextView view : mTxtViews) {
if (textViewId == view.getId()) {
view.setTextColor(getResources().getColor(R.color.theme_red));
} else {
view.setTextColor(getResources().getColor(R.color.black_normal_text_33333));
}
}
}
class SlbTextViewOnLister implements OnClickListener {
private int mItem;
public SlbTextViewOnLister(int item) {
this.mItem = item;
}
@Override
public void onClick(View v) {
mViewPager.setCurrentItem(mItem);
}
}
private ViewPager.OnPageChangeListener mOnButtomPageChangeListener = new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
switch (position) {
case 0:
changeViewBg(R.id.txt_viewpage_bar1, R.id.view_viewpage_bar1);
break;
case 1:
changeViewBg(R.id.txt_viewpage_bar2, R.id.view_viewpage_bar2);
break;
case 2:
changeViewBg(R.id.txt_viewpage_bar3, R.id.view_viewpage_bar3);
break;
case 3:
changeViewBg(R.id.txt_viewpage_bar4, R.id.view_viewpage_bar4);
break;
}
if (mSlbPageViewOnPageChangeListener != null)
mSlbPageViewOnPageChangeListener.onPageSelected(position);
}
@Override
public void onPageScrollStateChanged(int state) {
if (mSlbPageViewOnPageChangeListener != null)
mSlbPageViewOnPageChangeListener.onPageScrollStateChanged(state);
}
};
}
public class CommonViewpageAdapter extends FragmentPagerAdapter {
private List<Fragment> mFragments;
private String [] mTitles;
public CommonViewpageAdapter(FragmentManager fm, List<Fragment> fragments, String [] titles) {
super(fm);
mFragments = fragments;
mTitles = titles;
}
@Override
public Fragment getItem(int position) {
return mFragments.get(position);
}
@Override
public int getCount() {
return mFragments.size();
}
@Override
public CharSequence getPageTitle(int position) {
return mTitles[position];
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
super.destroyItem(container, position, object);
}
}
<com.slfinance.app.slb.common.ui.view.SlbPageViewBar
android:id="@+id/slbpv_buy_huoqibao_SlbPageViewBarshow"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"/>
private void initButtomPageFragment(SlbPageViewBar slbPageViewBar) {
List<Fragment> fragmentList = new ArrayList<>();
Test1Fragment test1Fragment = new Test1Fragment();
Test2Fragment test2Fragment = new Test2Fragment();
Test3Fragment test3Fragment = new Test3Fragment();
Test4Fragment test4Fragment = new Test4Fragment();
fragmentList.add(test1Fragment);
fragmentList.add(test2Fragment);
fragmentList.add(test3Fragment);
fragmentList.add(test4Fragment);
String[] titles = getResources().getStringArray(R.array.buy_huoqi_bao_zanquan_detail);
slbPageViewBar.setTitleView(titles);
CommonViewpageAdapter viewPagerAdapter = new CommonViewpageAdapter(
getSupportFragmentManager(), fragmentList, titles);
mButtomPageView.setAdapter(viewPagerAdapter);
mButtomPageView.setOffscreenPageLimit(3);
mButtomPageView.setCurrentItem(0);
}
