我有一个字符串,
String s = "test string (67)";
我想得到no 67,这是(和)之间的字符串.
谁能告诉我怎么做？
我正在尝试向ExpandableListView添加标头,如下所示:
headerView = View.inflate(this, R.layout.header, null);
expandableListView.addHeaderView(headerView);
expandableListView.setAdapter(new SectionedAdapter(this));
这给了我以下错误:
12-08 16:23:42.354:
ERROR/AndroidRuntime(421): Caused by:java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams
12-08 16:23:42.354: ERROR/AndroidRuntime(421): at android.widget.ListView.clearRecycledState(ListView.java:504)
12-08 16:23:42.354: ERROR/AndroidRuntime(421): at android.widget.ListView.resetList(ListView.java:490)
12-08 16:23:42.354:ERROR/AndroidRuntime(421):at android.widget.ListView.setAdapter(ListView.java:422)
12-08 16:23:42.354:ERROR/AndroidRuntime(421): at android.widget.ExpandableListView.setAdapter(ExpandableListView.java:475)
这是在电话会议上发生的expandableListView.setAdapter(new SectionedAdapter(this)),但我无法弄清楚原因.有任何想法吗？
android classcastexception expandablelistview android-linearlayout
我在Android的编程新和我,说我的应用程序运行的内存,这所示例我从一本书上抄,它正在与小图片的分辨率,但一个错误,当我加了几张照片具有更大的分辨率出来出现内存错误,可能是我做错了或者只是不知道我还应该使用图像,如果有人知道我应该改变什么,以便这个错误不再出现,请求帮助.谢谢期待!
源代码:
public class ImageViewsActivity extends Activity {
//the images to display
Integer[] imageIDs={
R.drawable.pic1,
R.drawable.pic2,
R.drawable.pic3,
R.drawable.pic4,
R.drawable.pic5
};
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final ImageView iv=(ImageView) findViewById(R.id.image1);
Gallery gallery=(Gallery) findViewById(R.id.gallery);
gallery.setAdapter(new ImageAdapter(this));
gallery.setOnItemClickListener(new OnItemClickListener(){
public void onItemClick(AdapterView<?> parent, View v, int position, long id){
Toast.makeText(getBaseContext(), "pic"+(position+1)+" selected", Toast.LENGTH_SHORT).show();
//display the image selected
try{iv.setScaleType(ImageView.ScaleType.FIT_CENTER);
iv.setImageResource(imageIDs[position]);}catch(OutOfMemoryError e){
iv.setImageBitmap(null);
}
}
});
}
public class ImageAdapter extends BaseAdapter{
private …我正在尝试以编程方式将WebView滚动到DOM树中特定元素的位置.但到目前为止,我还没有能够让WebView响应滚动请求.我试过调用使用的JavaScript window.scrollTo(...),但WebView没有响应.在Java方面,我试过调用该WebView.flingScroll(...)方法.WebView会响应flingScroll,但我需要的是一种scrollTo(...)功能.有任何想法吗？
我在创建时遇到错误 Toast
Toast toast = Toast.makeText(this, text, duration);
我得到无法解决的makeText()方法Toast.
我收到了这个错误
java:没有为makeText找到合适的方法(idtech.ESDN.ShapeData,java.lang.CharSequence,int)方法android.widget.Toast.makeText(android.content.Context,int,int)不适用(实际参数idtech. ESDN.ShapeData无法通过方法调用转换转换为android.content.Context方法android.widget.Toast.makeText(android.content.Context,java.lang.CharSequence,int)不适用(实际参数idtech.ESDN. ShapeData无法通过方法调用转换转换为android.content.Context)
我创建了一个自定义内容提供程序,将由更多应用程序访问.我在我的提供程序AndroidManifest.xml文件中包含了权限TAG,在第二个应用程序中,我包含了uses-permissions标记,但没有成功.Logcat告诉我:
java.lang.SecurityException: Permission Denial: opening provider com.company.contentprovider.AplicacaoContentProvider requires READ_DATABASE or WRITE_DATABASE.
我搜索过类似的问题,但似乎一切都是正确的.有任何想法吗 ？谢谢 !!!
这是我的提供者AndroidManifest.xml文件:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.company.contentprovider"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<permission android:name="READ_DATABASE" android:label="@string/app_read" android:protectionLevel="normal"></permission>
<permission android:name="WRITE_DATABASE" android:label="@string/app_write" android:protectionLevel="normal"></permission>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".CompanyProvider"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<provider android:name="AplicacaoContentProvider"
android:authorities="com.company.contentprovider"
android:exported="true"
android:readPermission="@string/app_read"
android:writePermission="@string/app_write"
/>
</application>
这是我的第二个应用程序AndroidManifest.xml文件:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.testeprovider"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="16" />
<uses-permission android:name="android.permissions.READ_DATABASE"/>
<uses-permission …如何从内部存储中删除文件夹(包含一些文件夹和文件)？文件夹下面有一些树.
folder
|_________ C2 (folder)
|________1 (folder)
|________1.gif
|________2.gif
|________3.gif
|________4.gif
|________2 (folder)
|________1.gif
|________2.gif
|________3.gif
|________4.gif
|________3 (folder)
|________1.gif
|________2.gif
|________3.gif
|________4.gif
|________4 (folder)
|________1.gif
|________2.gif
|________3.gif
|________4.gif
|________5 (folder)
|________1.gif
|________2.gif
|________3.gif
|________4.gif
|_________ C2.xml (file)
我想删除文件夹并包含所有文件
fil.delete();
System.out.println("boolean =>" + fil.delete());
但上面的代码显示为false.请帮忙.
问题是当数据不完整NSJSONSerialization.JSONObjectWithData导致应用程序崩溃unexpectedly found nil while unwrapping an Optional value而不是通知我们使用NSError变量时.所以我们无法阻止崩溃.
您可以在下面找到我们正在使用的代码
var error:NSError? = nil
let dataToUse = NSJSONSerialization.JSONObjectWithData(receivedData, options: NSJSONReadingOptions.AllowFragments, error:&error) as NSDictionary
if error != nil { println( "There was an error in NSJSONSerialization") }
直到现在我们都无法找到解决方法.
public class AudioRecorderActivity extends Activity {
private static final int RECORDER_SAMPLERATE = 8000;
private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_MONO;
private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;
private AudioRecord recorder = null;
private static final String TAG = "AudioRecorderActivity";
short[][] buffers = new short[256][160];
int ix = 0;
private boolean stopped = false;
private void startRecording() {
android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);
try {
int N = AudioRecord.getMinBufferSize (
RECORDER_SAMPLERATE,
RECORDER_CHANNELS,
RECORDER_AUDIO_ENCODING) * 20;
recorder = new AudioRecord(AudioSource.MIC,
RECORDER_SAMPLERATE,
RECORDER_CHANNELS,
RECORDER_AUDIO_ENCODING,N );
recorder.startRecording();
while(!stopped) …只想分享动态文本字符串+应用程序的URL.原生的Android共享意图设置正确,并且与Twitter,Gmail等完美配合.但是,正如许多人猜测的那样,它不适用于Facebook.显然因为Facebook不接受该intent.EXTRA_TEXT领域的文字,只有一个网址.
好吧,我对你们的问题是:有没有办法根据他们选择分享的方法来分支共享意图？例如,如果他们通过Gmail或Twitter共享,请使用现有的String + URL(所需选项)EXTRA_TEXT,但如果他们选择通过Facebook共享,则只使用URL作为EXTRA_TEXT.
并不是真的想要实现Facebook Android SDK来完成Android内置的简单任务.
感谢您的时间和建议.
试过这样的事情,但它显然失败了,因为它只检查共享选项是否存在(当共享弹出时,而不是在他们点击共享方法之后),它在选择方法时没有响应.
String shareBody = "app string text " + act_txt + " more text! Get the app at http://www.appurl.com";
PackageManager pm = view.getContext().getPackageManager();
List<ResolveInfo> activityList = pm.queryIntentActivities(sharingIntent, 0);
for(final ResolveInfo app : activityList) {
Log.i(TAG, "app.actinfo.name: " + app.activityInfo.name);
//if((app.activityInfo.name).contains("facebook")) {
if("com.facebook.katana.ShareLinkActivity".equals(app.activityInfo.name)) {
sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, "http://www.appurl.com");
startActivity(Intent.createChooser(sharingIntent, "Share idea"));
break;
} else {
sharingIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "app name");
sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, shareBody);
startActivity(Intent.createChooser(sharingIntent, "Share"));
break;
}
}