发布于 2016-02-18 11:43:53 | 106 次阅读 | 评论: 0 | 来源: 网友投递

这里有新鲜出炉的精品教程,程序狗速度看过来!

Android移动端操作系统

Android是一种基于Linux的自由及开放源代码的操作系统,主要使用于移动设备,如智能手机和平板电脑,由Google公司和开放手机联盟领导及开发。尚未有统一中文名称,中国大陆地区较多人使用“安卓”或“安致”。


Android 自定义列表适配器会提供很多的便利;下面的例子为使用自定义的列表适配器来显示列表,感兴趣的朋友可以研究下
下面的例子为使用自定义的列表适配器来显示列表。
 
View Code 
import android.os.Bundle; 
import android.app.ListActivity; 
import android.content.Context; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.LinearLayout; 
import android.widget.TextView; 
public class MainActivity extends ListActivity { 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setListAdapter(new SpeechListAdapter(this)); 
} 
/** 
* A sample ListAdapter that presents content from arrays of speeches and 
* text. 
* 
*/ 
private class SpeechListAdapter extends BaseAdapter { 
public SpeechListAdapter(Context context) { 
mContext = context; 
} 
/** 
* The number of items in the list is determined by the number of speeches 
* in our array. 
* 
* @see android.widget.ListAdapter#getCount() 
*/ 
public int getCount() { 
return mTitles.length; 
} 
/** 
* Since the data comes from an array, just returning the index is 
* sufficent to get at the data. If we were using a more complex data 
* structure, we would return whatever object represents one row in the 
* list. 
* 
* @see android.widget.ListAdapter#getItem(int) 
*/ 
public Object getItem(int position) { 
return position; 
} 
/** 
* Use the array index as a unique id. 
* 
* @see android.widget.ListAdapter#getItemId(int) 
*/ 
public long getItemId(int position) { 
return position; 
} 
/** 
* Make a SpeechView to hold each row. 
* 
* @see android.widget.ListAdapter#getView(int, android.view.View, 
* android.view.ViewGroup) 
*/ 
public View getView(int position, View convertView, ViewGroup parent) { 
SpeechView sv; 
if (convertView == null) { 
sv = new SpeechView(mContext, mTitles[position], 
mDialogue[position]); 
} else { 
sv = (SpeechView) convertView; 
sv.setTitle(mTitles[position]); 
sv.setDialogue(mDialogue[position]); 
} 
return sv; 
} 
/** 
* Remember our context so we can use it when constructing views. 
*/ 
private Context mContext; 
/** 
* Our data, part 1. 
*/ 
private String[] mTitles = 
{ 
"Henry IV (1)", 
"Henry V", 
"Henry VIII", 
"Richard II", 
"Richard III", 
"Merchant of Venice", 
"Othello", 
"King Lear" 
}; 
/** 
* Our data, part 2. 
*/ 
private String[] mDialogue = 
{ 
"So shaken as we are, so wan with care," + 
"Find we a time for frighted peace to pant," + 
"And breathe short-winded accents of new broils" + 
"To be commenced in strands afar remote." + 
"No more the thirsty entrance of this soil" + 
"Shall daub her lips with her own children's blood;" + 
"Nor more shall trenching war channel her fields," + 
"Nor bruise her flowerets with the armed hoofs" + 
"Of hostile paces: those opposed eyes," + 
"Which, like the meteors of a troubled heaven," + 
"All of one nature, of one substance bred," + 
"Did lately meet in the intestine shock" + 
"And furious close of civil butchery" + 
"Shall now, in mutual well-beseeming ranks," + 
"March all one way and be no more opposed" + 
"Against acquaintance, kindred and allies:" + 
"The edge of war, like an ill-sheathed knife," + 
"No more shall cut his master. Therefore, friends," + 
"As far as to the sepulchre of Christ," + 
"Whose soldier now, under whose blessed cross" + 
"We are impressed and engaged to fight," + 
"Forthwith a power of English shall we levy;" + 
"Whose arms were moulded in their mothers' womb" + 
"To chase these pagans in those holy fields" + 
"Over whose acres walk'd those blessed feet" + 
"Which fourteen hundred years ago were nail'd" + 
"For our advantage on the bitter cross." + 
"But this our purpose now is twelve month old," + 
"And bootless 'tis to tell you we will go:" + 
"Therefore we meet not now. Then let me hear" + 
"Of you, my gentle cousin Westmoreland," + 
"What yesternight our council did decree" + 
"In forwarding this dear expedience.", 
"Hear him but reason in divinity," + 
"And all-admiring with an inward wish" + 
"You would desire the king were made a prelate:" + 
"Hear him debate of commonwealth affairs," + 
"You would say it hath been all in all his study:" + 
"List his discourse of war, and you shall hear" + 
"A fearful battle render'd you in music:" + 
"Turn him to any cause of policy," + 
"The Gordian knot of it he will unloose," + 
"Familiar as his garter: that, when he speaks," + 
"The air, a charter'd libertine, is still," + 
"And the mute wonder lurketh in men's ears," + 
"To steal his sweet and honey'd sentences;" + 
"So that the art and practic part of life" + 
"Must be the mistress to this theoric:" + 
"Which is a wonder how his grace should glean it," + 
"Since his addiction was to courses vain," + 
"His companies unletter'd, rude and shallow," + 
"His hours fill'd up with riots, banquets, sports," + 
"And never noted in him any study," + 
"Any retirement, any sequestration" + 
"From open haunts and popularity.", 
"I come no more to make you laugh: things now," + 
"That bear a weighty and a serious brow," + 
"Sad, high, and working, full of state and woe," + 
"Such noble scenes as draw the eye to flow," + 
"We now present. Those that can pity, here" + 
"May, if they think it well, let fall a tear;" + 
"The subject will deserve it. Such as give" + 
"Their money out of hope they may believe," + 
"May here find truth too. Those that come to see" + 
"Only a show or two, and so agree" + 
"The play may pass, if they be still and willing," + 
"I'll undertake may see away their shilling" + 
"Richly in two short hours. Only they" + 
"That come to hear a merry bawdy play," + 
"A noise of targets, or to see a fellow" + 
"In a long motley coat guarded with yellow," + 
"Will be deceived; for, gentle hearers, know," + 
"To rank our chosen truth with such a show" + 
"As fool and fight is, beside forfeiting" + 
"Our own brains, and the opinion that we bring," + 
"To make that only true we now intend," + 
"Will leave us never an understanding friend." + 
"Therefore, for goodness' sake, and as you are known" + 
"The first and happiest hearers of the town," + 
"Be sad, as we would make ye: think ye see" + 
"The very persons of our noble story" + 
"As they were living; think you see them great," + 
"And follow'd with the general throng and sweat" + 
"Of thousand friends; then in a moment, see" + 
"How soon this mightiness meets misery:" + 
"And, if you can be merry then, I'll say" + 
"A man may weep upon his wedding-day.", 
"First, heaven be the record to my speech!" + 
"In the devotion of a subject's love," + 
"Tendering the precious safety of my prince," + 
"And free from other misbegotten hate," + 
"Come I appellant to this princely presence." + 
"Now, Thomas Mowbray, do I turn to thee," + 
"And mark my greeting well; for what I speak" + 
"My body shall make good upon this earth," + 
"Or my divine soul answer it in heaven." + 
"Thou art a traitor and a miscreant," + 
"Too good to be so and too bad to live," + 
"Since the more fair and crystal is the sky," + 
"The uglier seem the clouds that in it fly." + 
"Once more, the more to aggravate the note," + 
"With a foul traitor's name stuff I thy throat;" + 
"And wish, so please my sovereign, ere I move," + 
"What my tongue speaks my right drawn sword may prove.", 
"Now is the winter of our discontent" + 
"Made glorious summer by this sun of York;" + 
"And all the clouds that lour'd upon our house" + 
"In the deep bosom of the ocean buried." + 
"Now are our brows bound with victorious wreaths;" + 
"Our bruised arms hung up for monuments;" + 
"Our stern alarums changed to merry meetings," + 
"Our dreadful marches to delightful measures." + 
"Grim-visaged war hath smooth'd his wrinkled front;" + 
"And now, instead of mounting barded steeds" + 
"To fright the souls of fearful adversaries," + 
"He capers nimbly in a lady's chamber" + 
"To the lascivious pleasing of a lute." + 
"But I, that am not shaped for sportive tricks," + 
"Nor made to court an amorous looking-glass;" + 
"I, that am rudely stamp'd, and want love's majesty" + 
"To strut before a wanton ambling nymph;" + 
"I, that am curtail'd of this fair proportion," + 
"Cheated of feature by dissembling nature," + 
"Deformed, unfinish'd, sent before my time" + 
"Into this breathing world, scarce half made up," + 
"And that so lamely and unfashionable" + 
"That dogs bark at me as I halt by them;" + 
"Why, I, in this weak piping time of peace," + 
"Have no delight to pass away the time," + 
"Unless to spy my shadow in the sun" + 
"And descant on mine own deformity:" + 
"And therefore, since I cannot prove a lover," + 
"To entertain these fair well-spoken days," + 
"I am determined to prove a villain" + 
"And hate the idle pleasures of these days." + 
"Plots have I laid, inductions dangerous," + 
"By drunken prophecies, libels and dreams," + 
"To set my brother Clarence and the king" + 
"In deadly hate the one against the other:" + 
"And if King Edward be as true and just" + 
"As I am subtle, false and treacherous," + 
"This day should Clarence closely be mew'd up," + 
"About a prophecy, which says that 'G'" + 
"Of Edward's heirs the murderer shall be." + 
"Dive, thoughts, down to my soul: here" + 
"Clarence comes.", 
"To bait fish withal: if it will feed nothing else," + 
"it will feed my revenge. He hath disgraced me, and" + 
"hindered me half a million; laughed at my losses," + 
"mocked at my gains, scorned my nation, thwarted my" + 
"bargains, cooled my friends, heated mine" + 
"enemies; and what's his reason? I am a Jew. Hath" + 
"not a Jew eyes? hath not a Jew hands, organs," + 
"dimensions, senses, affections, passions? fed with" + 
"the same food, hurt with the same weapons, subject" + 
"to the same diseases, healed by the same means," + 
"warmed and cooled by the same winter and summer, as" + 
"a Christian is? If you prick us, do we not bleed?" + 
"if you tickle us, do we not laugh? if you poison" + 
"us, do we not die? and if you wrong us, shall we not" + 
"revenge? If we are like you in the rest, we will" + 
"resemble you in that. If a Jew wrong a Christian," + 
"what is his humility? Revenge. If a Christian" + 
"wrong a Jew, what should his sufferance be by" + 
"Christian example? Why, revenge. The villany you" + 
"teach me, I will execute, and it shall go hard but I" + 
"will better the instruction.", 
"Virtue! a fig! 'tis in ourselves that we are thus" + 
"or thus. Our bodies are our gardens, to the which" + 
"our wills are gardeners: so that if we will plant" + 
"nettles, or sow lettuce, set hyssop and weed up" + 
"thyme, supply it with one gender of herbs, or" + 
"distract it with many, either to have it sterile" + 
"with idleness, or manured with industry, why, the" + 
"power and corrigible authority of this lies in our" + 
"wills. If the balance of our lives had not one" + 
"scale of reason to poise another of sensuality, the" + 
"blood and baseness of our natures would conduct us" + 
"to most preposterous conclusions: but we have" + 
"reason to cool our raging motions, our carnal" + 
"stings, our unbitted lusts, whereof I take this that" + 
"you call love to be a sect or scion.", 
"Blow, winds, and crack your cheeks! rage! blow!" + 
"You cataracts and hurricanoes, spout" + 
"Till you have drench'd our steeples, drown'd the cocks!" + 
"You sulphurous and thought-executing fires," + 
"Vaunt-couriers to oak-cleaving thunderbolts," + 
"Singe my white head! And thou, all-shaking thunder," + 
"Smite flat the thick rotundity o' the world!" + 
"Crack nature's moulds, an germens spill at once," + 
"That make ingrateful man!" 
}; 
} 
/** 
* We will use a SpeechView to display each speech. It's just a LinearLayout 
* with two text fields. 
* 
*/ 
private class SpeechView extends LinearLayout { 
public SpeechView(Context context, String title, String words) { 
super(context); 
this.setOrientation(VERTICAL); 
// Here we build the child views in code. They could also have 
// been specified in an XML file. 
mTitle = new TextView(context); 
mTitle.setText(title); 
addView(mTitle, new LinearLayout.LayoutParams( 
LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT)); 
mDialogue = new TextView(context); 
mDialogue.setText(words); 
addView(mDialogue, new LinearLayout.LayoutParams( 
LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT)); 
} 
/** 
* Convenience method to set the title of a SpeechView 
*/ 
public void setTitle(String title) { 
mTitle.setText(title); 
} 
/** 
* Convenience method to set the dialogue of a SpeechView 
*/ 
public void setDialogue(String words) { 
mDialogue.setText(words); 
} 
private TextView mTitle; 
private TextView mDialogue; 
} 
} 

该例子中自定义了适配器 SpeechListAdapter (其继承父类BaseAdapter)以及作为记录模板的 SpeechView(其父类为LinearLayout)。
SpeechListAdapter中的方法getView实现了返回指定位置的记录显示对象的逻辑。

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