小编use*_*147的帖子

我有多个LinearLayouts,其组合高度很容易超过设备的屏幕高度.所以为了使我的布局可滚动,我尝试添加一个ScrollView,但不幸的是我收到以下错误:

Scrollview只能容纳一个直接孩子

我做了一些研究,但即使在阅读了几个解决方案之后,也无法理解如何解决它.我尝试了一些改变,但到目前为止我没有任何作用.有帮助吗？

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

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

    <LinearLayout 
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:paddingTop="20dip">
    <TextView
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Question 1"
        android:paddingBottom="20dip"
        android:gravity="center" />
    <TextView
        android:id="@+id/q1_score"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text=""
        android:gravity="center"/>
</LinearLayout>
<LinearLayout 
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">
    <TextView
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Question 2"
        android:paddingBottom="20dip"
        android:gravity="center" />
    <TextView
        android:id="@+id/q2_score"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text=""
        android:gravity="center"/>
</LinearLayout>
<LinearLayout 
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">
    <TextView
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="Question 3"
        android:paddingBottom="20dip"
        android:gravity="center" />
    <TextView
        android:id="@+id/q3_score"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text=""
        android:gravity="center"/>
</LinearLayout> …

收到电话时,MediaPlayer不会暂停.如果有人能提供帮助就会很棒!

码:

 public class player1 extends Activity implements Runnable {


private  MediaPlayer mp;
private ProgressBar progressBar;
private ImageButton pauseicon;
private final int NUM_SOUND_FILES = 3;  //*****REPLACE THIS WITH THE ACTUAL NUMBER OF SOUND FILES YOU HAVE*****
private int mfile[] = new int[NUM_SOUND_FILES];
private Random rnd = new Random();

   @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.player_1);
        pauseicon = (ImageButton) findViewById(R.id.pauseicon);
        progressBar = (ProgressBar) findViewById(R.id.progressBar);
        getActionBar().setDisplayHomeAsUpEnabled(true);



        mfile[0] = R.raw.sound01;  //****REPLACE THESE WITH THE PROPER NAMES OF YOUR SOUND FILES
        mfile[1] = …

我正试图在我的应用程序中使用标记在片段中设置Google地图.当我第一次点击它时它起作用,但是当我点击另一个片段然后返回谷歌地图时它会崩溃.不确定是什么问题？任何帮助都会很棒,只有初学者.

继承人代码:

XML

<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.google.android.gms.maps.SupportMapFragment"/>

Java google maps片段编辑工作代码如下

public class Fragment_8 extends Fragment{

static final LatLng BottleCapp = new LatLng(51.371986, 0.065593);
  private GoogleMap map;
  private static View view;

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
      if (view != null) {
          ViewGroup parent = (ViewGroup) view.getParent();
          if (parent != null)
              parent.removeView(view);
      }
      try {
          view = inflater.inflate(R.layout.fragment_8, container, false);
      } catch (InflateException e) {
          /* map is already there, just return …

扩展所有这些物体对我来说是否有捷径？我附上了一张我想在下面展开的照片.任何帮助都会很棒.

从网站制作应用和流媒体音频.我有一个菜单,当我点击按钮打开收音机活动时,它可能需要8-20秒才能加载,有时会强制关闭.任何帮助都会非常棒,谢谢.

码:

  public class Radio extends Activity {

private MediaPlayer mp;
private ImageButton pauseicon;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.player_1);

    pauseicon = (ImageButton) findViewById(R.id.pauseicon);
    getActionBar().setDisplayHomeAsUpEnabled(true);

    /**
     * Play button click event plays a song and changes button to pause
     * image pauses a song and changes button to play image
     * */

    String res = "http://216.235.91.36/play?s=magic24point7&d=LIVE365&r=0&membername=&session=magic24point7:0&AuthType=NORMAL&app_id=live365%3ABROWSER&SaneID=24.79.96.172-13316781890137014897763&tag=live365";

    mp = new MediaPlayer();
    try {
        mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
        mp.setDataSource(res);
        mp.prepare();
        mp.start();

    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (IllegalStateException e) {
        e.printStackTrace(); …

WebView没有正确显示网站.任何帮助都会很棒!代码已经在所有其他网站上使用了.不确定这个问题是什么.我应该添加什么？适用于Chrome和其他浏览器,因此不知道该怎么做.任何帮助都会很棒!

的WebView

铬

public class Website extends Activity {
    WebView myWebView;
    LinearLayout root;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.website);

        myWebView = (WebView) findViewById(R.id.webView);

        root = (LinearLayout) findViewById(R.id.root);

        WebSettings webSettings = myWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);

       myWebView.addJavascriptInterface(new WebAppInterface(this), "Android");
           myWebView.setWebViewClient(new WebViewClient());
           myWebView.getSettings().setBuiltInZoomControls(true);
           myWebView.getSettings().setSupportZoom(true); 
           myWebView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT); 
                   myWebView.getSettings().setDomStorageEnabled(true);

           myWebView.loadUrl("http://dspart.org/");

        getActionBar().setDisplayHomeAsUpEnabled(true);
    }

    public class WebAppInterface {
        Context mContext;

        /** Instantiate the interface and set the context */
        WebAppInterface(Context c) {
            mContext = c;
        }

        /** Show a toast from the web page */
        @JavascriptInterface
        public …

得到错误,抱歉只是初学者.所有的帮助都会很棒.

  05-31 21:49:16.077: E/AndroidRuntime(655): FATAL EXCEPTION: main
  05-31 21:49:16.077: E/AndroidRuntime(655): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.appal.song/com.appal.song.MainActivity}: java.lang.NullPointerException
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.app.ActivityThread.access$600(ActivityThread.java:123)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.os.Handler.dispatchMessage(Handler.java:99)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.os.Looper.loop(Looper.java:137)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.app.ActivityThread.main(ActivityThread.java:4424)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at java.lang.reflect.Method.invokeNative(Native Method)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at java.lang.reflect.Method.invoke(Method.java:511)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at dalvik.system.NativeStart.main(Native Method)
  05-31 …