SectionIndexer 的施用（联系人分...- xcode4 设置调试异常信息小结 ...- NSPredicate及正则表达式的施用心得分享

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▪SectionIndexer 的施用（联系人分类索引） SectionIndexer 的使用（联系人分类索引） // 获取标题栏索引 int position = sectionIndexter.getPositionForSection(l[idx]); if (position == -1) { return true; .........

▪ xcode4 设置调试异常信息小结 xcode4 设置调试错误信息小结原文出处：http://blog.csdn.net/cococoolwhj/article/details/6944572soulutions: 1. 设置环境变量NSZombieEnabled-YES 2.设置环境变量MallocStackLogging-YES 出错的时候shell malloc_histor.........

▪ NSPredicate及正则表达式的施用心得分享 NSPredicate及正则表达式的使用心得分享判断字符串首字母是否为字母。Objective-c代码NSString *regex = @"[A-Za-z]+";NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];if ([predicate evalu.........

[1]SectionIndexer 的施用（联系人分类索引）

来源: 互联网发布时间: 2014-02-18

SectionIndexer 的使用（联系人分类索引）

// 获取标题栏索引

int position = sectionIndexter.getPositionForSection(l[idx]);

if (position == -1) {

return true;

}

// 设置调整到指定区域

list.setSelection(position);

1. Main.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout

xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="fill_parent">

<ListView android:id="@+id/myListView"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

<android.test.SideBar

android:id = "@+id/sideBar"

android:layout_height="fill_parent"

android:layout_width="22px"

android:layout_alignParentRight="true"

</RelativeLayout>

2. listview_row.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout

xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="wrap_content">

<LinearLayout

android:id="@+id/section"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

<TextView android:id="@+id/textView"

android:layout_width="wrap_content"

android:layout_height="80sp"

android:textSize="45sp"

</LinearLayout>

3. MyAdapter.java

package android.test;

import java.util.ArrayList;

import android.app.Activity;

import android.content.Context;

import android.graphics.Color;

import android.view.Gravity;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.LinearLayout;

import android.widget.SectionIndexer;

import android.widget.TextView;

public class MyAdapter extends BaseAdapter implements SectionIndexer {

private ArrayList<String> stringArray;

private Context context;

public MyAdapter(Context _context, ArrayList<String> arr) {

stringArray = arr;

context = _context;

}

public int getCount() {

return stringArray.size();

}

public Object getItem(int arg0) {

return stringArray.get(arg0);

}

public long getItemId(int arg0) {

return 0;

}

public View getView(int position, View v, ViewGroup parent) {

LayoutInflater inflate = ((Activity) context).getLayoutInflater();

View view = (View) inflate.inflate(R.layout.listview_row, null);

LinearLayout header = (LinearLayout) view.findViewById(R.id.section);

String label = stringArray.get(position);

char firstChar = label.toUpperCase().charAt(0);

if (position == 0) {

setSection(header, label);

} else {

String preLabel = stringArray.get(position - 1);

char preFirstChar = preLabel.toUpperCase().charAt(0);

if (firstChar != preFirstChar) {

setSection(header, label);

} else {

header.setVisibility(View.GONE);

}

TextView textView = (TextView) view.findViewById(R.id.textView);

textView.setText(label);

return view;

}

private void setSection(LinearLayout header, String label) {

TextView text = new TextView(context);

header.setBackgroundColor(0xffaabbcc);

text.setTextColor(Color.WHITE);

text.setText(label.substring(0, 1).toUpperCase());

text.setTextSize(20);

text.setPadding(5, 0, 0, 0);

text.setGravity(Gravity.CENTER_VERTICAL);

header.addView(text);

}

public int getPositionForSection(int section) {

if (section == 35) {

return 0;

}

for (int i = 0; i < stringArray.size(); i++) {

String l = stringArray.get(i);

char firstChar = l.toUpperCase().charAt(0);

if (firstChar == section) {

return i;

}

return -1;

}

public int getSectionForPosition(int arg0) {

return 0;

}

public Object[] getSections() {

return null;

}

4. SideBar.java

package android.test;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.util.AttributeSet;

import android.view.MotionEvent;

import android.view.View;

import android.widget.ListView;

import android.widget.SectionIndexer;

public class SideBar extends View {

private char[] l;

private SectionIndexer sectionIndexter = null;

private ListView list;

private final int m_nItemHeight = 29;

public SideBar(Context context) {

super(context);

init();

}

public SideBar(Context context, AttributeSet attrs) {

super(context, attrs);

init();

}

private void init() {

l = new char[] { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S',

'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };

setBackgroundColor(0x44FFFFFF);

}

public SideBar(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

init();

}

public void setListView(ListView _list) {

list = _list;

sectionIndexter = (SectionIndexer) _list.getAdapter();

}

public boolean onTouchEvent(MotionEvent event) {

super.onTouchEvent(event);

int i = (int) event.getY();

int idx = i / m_nItemHeight;

if (idx >= l.length) {

idx = l.length - 1;

} else if (idx < 0) {

idx = 0;

}

if (event.getAction() == MotionEvent.ACTION_DOWN || event.getAction() == MotionEvent.ACTION_MOVE) {

if (sectionIndexter == null) {

sectionIndexter = (SectionIndexer) list.getAdapter();

}

int position = sectionIndexter.getPositionForSection(l[idx]);

if (position == -1) {

return true;

}

list.setSelection(position);

}

return true;

}

protected void onDraw(Canvas canvas) {

Paint paint = new Paint();

paint.setColor(0xFFA6A9AA);

paint.setTextSize(20);

paint.setTextAlign(Paint.Align.CENTER);

float widthCenter = getMeasuredWidth() / 2;

for (int i = 0; i < l.length; i++) {

canvas.drawText(String.valueOf(l[i]), widthCenter, m_nItemHeight + (i * m_nItemHeight), paint);

}

super.onDraw(canvas);

}

5. Main.java

package android.test;

import java.util.ArrayList;

import android.app.Activity;

import android.os.Bundle;

import android.widget.ListView;

public class Main extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

ListView list = (ListView) findViewById(R.id.myListView);

ArrayList<String> stringList = InitListViewData();

MyAdapter adapter = new MyAdapter(this, stringList);

list.setAdapter(adapter);

SideBar indexBar = (SideBar) findViewById(R.id.sideBar);

indexBar.setListView(list);

}

private ArrayList<String> InitListViewData() {

ArrayList<String> stringList = new ArrayList<String>();

stringList.add("aback");

stringList.add("abash");

stringList.add("abbey");

stringList.add("abhor");

stringList.add("abide");

stringList.add("abuse");

stringList.add("candidate");

stringList.add("capture");

stringList.add("careful");

stringList.add("catch");

stringList.add("cause");

stringList.add("celebrate");

stringList.add("forever");

stringList.add("fable");

stringList.add("fidelity");

stringList.add("fox");

stringList.add("funny");

stringList.add("fail");

stringList.add("jail");

stringList.add("jade");

stringList.add("jailor");

stringList.add("january");

stringList.add("jasmine");

stringList.add("jazz");

stringList.add("zero");

stringList.add("zoo");

stringList.add("zeus");

stringList.add("zebra");

stringList.add("zest");

stringList.add("zing");

return stringList;

}

[2] xcode4 设置调试异常信息小结

来源: 互联网发布时间: 2014-02-18

xcode4 设置调试错误信息小结
原文出处：

http://blog.csdn.net/cococoolwhj/article/details/6944572

soulutions:

1. 设置环境变量NSZombieEnabled-YES
2.设置环境变量MallocStackLogging-YES
   出错的时候shell malloc_history pid address

   pid: ProcessID
   address: 变量的内存地址

[3] NSPredicate及正则表达式的施用心得分享

来源: 互联网发布时间: 2014-02-18

NSPredicate及正则表达式的使用心得分享
判断字符串首字母是否为字母。
Objective-c代码
NSString *regex = @"[A-Za-z]+";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];

if ([predicate evaluateWithObject:aString]) {
}

NSString *regex = @"[A-Za-z]+";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];

if ([predicate evaluateWithObject:aString]) {
}

判断Array中是否包含某一规则的对象，并返回一个数组：
NSPredicate *filterPredicate = [NSPredicate predicateWithFormat:@"SELF CONTAINS %@", regex];
并调用：- (NSArray *)filteredArrayUsingPredicate:(NSPredicate *)predicate; 方法即可。本文来自织梦

获得一个数组中某些对象除外的数组：
NSPredicate *notPredicate = [NSPredicate predicateWithFormat:@"NOT (SELF in %@)", arrayFilter2];且还是要调用- (NSArray *)filteredArrayUsingPredicate:(NSPredicate *)predicate; 方法。

同样，如果我们想找出某个范围内的对象，创建如下Predicate (这里可以用到所有的比较操作符)： NSPredicate *pre = [NSPredicate predicateWithFormat:@"self.*** < 5"];
并调用：- (BOOL)evaluateWithObject:(id)object;方法。
在这里啰嗦一句，如果只是在数组中查找是否存在对象时用indexOfObject,如果不存在则返回为NSNotFound.

字符串替换：
Objective-c代码
NSError* error = NULL;
NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern:@"(encoding=\")[^\"]+(\")"
options:0
error:&error];
NSString* sample = @"";
NSLog(@"Start:%@",sample);
NSString* result = [regex stringByReplacingMatchesInString:sample
options:0
range:NSMakeRange(0, sample.length)
withTemplate:@"$1utf-8$2"];
NSLog(@"Result:%@", result);

NSError* error = NULL;
NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern:@"(encoding=\")[^\"]+(\")"
options:0
error:&error];
NSString* sample = @"";
NSLog(@"Start:%@",sample);
NSString* result = [regex stringByReplacingMatchesInString:sample
options:0
range:NSMakeRange(0, sample.length)
withTemplate:@"$1utf-8$2"];
NSLog(@"Result:%@", result);

from:http://lovelysimon.blog.sohu.com/190483498.html