我头上有很多问号.我没有得到的是在xcode 4.3之前我需要在我的实现文件中声明前向声明(对于私有方法).
就像我的.m文件一样:
// deleting this with xcode 4.3 the below code still does work
// in previous versions i had to put this because otherwise the compiler can't find methodFirst
@interface DetailViewController ()
- (void)methodFirst;
- (void)methodSecond;
@end
@implementation DetailViewController
- (void) methodSecond
{
// if i delete the forward declaration now adays i dont get a compiler error that he cant find method first
[self methodFirst];
}
- (void) methodFirst
{
}
@end
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现在看来我不再需要那样做了?Apple是否更新了编译器以便不再需要提交声明?
我找不到任何有关此更改的Apple官方消息来源的参考.我想知道其他人在新环境中遇到了什么.
我已经实现了动作栏SearchView,它工作正常,但在屏幕的底部显示了一个浮动文本弹出窗口.看截图:
ListView Java类:
@Override
public boolean onQueryTextChange(String newText) {
if (TextUtils.isEmpty(newText)) {
mListView.clearTextFilter();
} else {
// EventAdapterView ca = (EventAdapterView)mListView.getAdapter();
// ca.getFilter().filter(newText.toString());
// Filter lFilter = mDataAdapter.getFilter();
// lFilter.filter("");
// following line was causing the ugly popup window.
mListView.setFilterText(newText.toString());
// EventAdapterView ca = (EventAdapterView)mListView.getAdapter();
// ca.getFilter().filter(newText.toString());
}
return true;
}
@Override
public boolean onQueryTextSubmit(String query) {
return true;
}
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适配器类
@Override
public Filter getFilter() {
/**
* A filter object which will filter message key
* */
Filter filter …
Run Code Online (Sandbox Code Playgroud) 在Android 5.0之前,我能够使用DexClassLoader和调用loadClass()
方法动态加载DEX文件,但是使用最新的Android版本,我得到了一个ClassNotFoundException
.
这是我在做的事情:
生成DEX文件.
../android-sdk/android-sdk-linux_86/build-tools/21.1.1/dx --dex --output=bin/output.dex bin/output.jar
Run Code Online (Sandbox Code Playgroud)创建一个DexClassLoader.
DexClassLoader cl = new DexClassLoader(
dexFile.getAbsolutePath(),
odexFile.getAbsolutePath(),
null,
mContext.getClassLoader());
Run Code Online (Sandbox Code Playgroud)呼叫 cl.loadClass("myMethod");
我知道ART使用dex2oat来生成一个由ART加载的ELF文件但是在步骤2中我生成了一个ODEX文件,因此我不需要在ART中运行以在运行时加载DEX文件,任何人都可以帮助我 ?
我想改变首选的网络模式,即.在Android上以编程方式从代码中获取gsm或wcdma或auto.
这是可能的,如果是这样的话怎么样?
是否可以将App Engine Java与IntelliJ Community Edition一起使用?我知道Ultimate Edition有一个官方插件.
我想要:
我是Hadoop中的新手,尝试使用Hadoop 2.5.2在伪分布式模式下安装Hbase,版本为hbase-0.98.10.1-hadoop1-bin.我无法添加表格.
当我尝试创建表时,以下错误仍在继续:
client.HConnectionManager$HConnectionImplementation: The node /hbase is not in ZooKeeper. It should have been written by the master. Check the value configured in 'zookeeper.znode.parent'. There could be a mismatch with the one configured in the master.
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它最终显示错误多次(约50次)后给出最终错误:
ERROR: The node /hbase is not in ZooKeeper. It should have been written by the master. Check the value configured in 'zookeeper.znode.parent'. There could be a mismatch with the one configured in the master.
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日志文件的最新条目是:
2015-02-23 16:38:39,456 ERROR [main] master.HMasterCommandLine: Master exiting …
Run Code Online (Sandbox Code Playgroud) 虽然我有一些Java经验,但下面的代码对我来说有点奇怪:
public class ForLoopTest{
public static void main(String[] args){
for(;;){}
}
}
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虽然初始化测试增量部分是空的,但是这个代码编译得很好,这与通常的for循环不同:
for(int i=0; i<10; i++){}
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由于代码编译很好,它是有效的语法.
这种类型的for循环有没有实际用途,没有初始化测试增量部分?
我正在使用jQuery UI滑块.
这是我正在使用的代码:
$(function() {
$( "#slider" ).slider({
value:1,
min: 0,
max: 5,
step: 1,
slide: function( event, ui ) {
$( "#amount" ).val( "$" + ui.value );
}
});
$( "#amount" ).val( "$" + $( "#slider" ).slider( "value" ) );
});
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将有5个步骤,我想在每个步骤中显示字符串而不是数字:
1=very sad
2=sad
3=not so sad
4=happy
5=very happy
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我怎样才能做到这一点 ?
我正试图通过锁定屏幕显示Google位置服务(打开GPS,网络数据等)对话框.
我正在使用KeyguardManager来禁用锁定屏幕.这可以正常工作,因为我的MainActivity能够禁用锁定屏幕.但是,只要Google位置服务对话框显示,锁定屏幕就会恢复启用,屏幕会被锁定,除非我解锁屏幕,否则无法进入我的MainActivity.
我甚至试过...... Flag_Show_When_Locked,但它没有帮助.
这是我的代码:
private KeyguardLock DisableScreenLock;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
setContentView(R.main_layout);
KeyguardManager myKeyGuard = (KeyguardManager)getSystemService(Context.KEYGUARD_SERVICE);
DisableScreenLock = myKeyGuard.newKeyguardLock("disableKeyguard");
DisableScreenLock.disableKeyguard();
}
protected synchronized void GoogleApiClient_Intialize() {
Log.e(TAG, "Building GoogleApiClient");
googleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
protected void LocationRequest_Intialize() {
locationRequest = new LocationRequest();
locationRequest.setInterval(UPDATE_INTERVAL_IN_MILLISECONDS);
locationRequest.setFastestInterval(FASTEST_UPDATE_INTERVAL_IN_MILLISECONDS);
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
}
protected void LocationSettingsRequest_Builder() {
LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder();
builder.addLocationRequest(locationRequest);
locationSettingsRequest = builder.build();
}
@Override
public void onConnected(Bundle connectionHint) {
Log.e(TAG, "GoogleApiClient is connected"); …
Run Code Online (Sandbox Code Playgroud) android lockscreen android-networking location-services android-gps
Android有两种不同的方法来转义/编码Strings中的HTML字符/实体:
Html.escapeHtml(String)
,在API 16(Android 4.1)中添加.文档说:
返回给定纯文本的HTML转义表示形式.
TextUtils.htmlEncode(String)
对于这个,文档说:
Html编码字符串.
阅读文档,他们似乎都做了几乎相同的事情,但是,在测试它们时,我得到一些非常神秘(对我而言)的输出.
例如.随着输入:<p>This is a quote ". This is a euro symbol: €. <b>This is some bold text</b></p>
Html.escapeHtml
得到:
<p>This is a quote ". This is a euro symbol: €. <b>This is some bold text</b></p>
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给出:
<p>This is a quote ". This is a euro symbol: €. <b>This is some bold text</b></p>
Run Code Online (Sandbox Code Playgroud)所以似乎第二个转义/编码引号("),但第一个没有,虽然第一个编码欧元符号,但第二个没有.我很困惑.
那么这两种方法有什么区别呢?每个转义/编码的字符是什么?编码和转义之间的区别是什么?我什么时候应该使用其中一种(或者我应该喘气,一起使用它们?)?
android html-encode html-entities android-webview html-escape
android ×5
java ×2
android-gps ×1
classloader ×1
declaration ×1
dex ×1
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for-loop ×1
forward ×1
hadoop ×1
hbase ×1
hdfs ×1
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jquery-ui ×1
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