小编cod*_*gic的帖子

为什么它会一直显示红色如果我导入了库？

我目前正致力于在Android上编写一个简单的消息应用程序.我把服务器放在一个叫做的类中runServer,它运行得很好.然后我在我的方法中有一个客户端mainActivity.我有一个button,有一个onclick="startClient".但每当我点击它时button,我都会收到错误.

03-11 13:01:40.622: E/AndroidRuntime(718): java.lang.IllegalStateException: 
Could not find a method startClient(View) in the activity class com.example.datorkomprojekt.MainActivity 
for onClick handler on view class android.widget.Button with id 'connect'

我该怎么做才能解决这个问题？

主要活动

public class MainActivity extends Activity {

private Socket socket;
private ObjectInputStream ois;
private DataOutputStream dos;


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

    runOnUiThread(new Runnable(){
        public void run(){
        EditText et = (EditText) findViewById(R.id.message_id);
        String message = et.getText().toString();
        EditText et1 = (EditText) findViewById(R.id.messages); …

我有这个代码

    b1.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            intent.putExtra("chapter", 1);
            b1.startAnimation(animZoom1);
            startActivity(intent);
        }});

该方法一次运行所有行，动画持续时间为 1.5 秒，但Activity运行时间不到 0.5 秒我只想StartActiviy(intenet);在动画结束后运行

我仍然是一个初学者,但试图学习,所以可能做一些非常愚蠢的事情.我的问题是关于我想要制作的一个简单的Android计算器,但我认为这个问题涉及我认为我理解的基本Java.我从按下的按钮获取值,然后将其传递给方法以显示输入,然后为输入设置全局变量.如果我按"1"但方法标题中的值为"1",然后在该方法中丢失.也许我不明白如何处理Java类型,就像我想的那样 - 不知道.我有一次逻辑工作,但不得不改变它的显示方式,当然,这在某个地方搞砸了我的逻辑.无论如何,我现在将发布传递声明和接收方法.提前致谢.

  public void initButtons()
{
    //register buttons as listeners
    final Button button1 = (Button) findViewById(R.id.button1);
    final Button button2 = (Button) findViewById(R.id.button2);
    final Button button3 = (Button) findViewById(R.id.button3);
    final Button button4 = (Button) findViewById(R.id.button4);
    final Button button5 = (Button) findViewById(R.id.button5);
    final Button button6 = (Button) findViewById(R.id.button6);
    final Button button7 = (Button) findViewById(R.id.button7);
    final Button button8 = (Button) findViewById(R.id.button8);
    final Button button9 = (Button) findViewById(R.id.button9);
    final Button button10 = (Button) findViewById(R.id.button10);
    final Button addButton = (Button) findViewById(R.id.addButton);
    final Button subButton …

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:gravity="center_vertical"
android:orientation="horizontal"

 >

<ImageView

    android:id="@+id/file_icon"
    style="@style/fileChooserIcon"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:contentDescription="@string/desc" />

<TextView
    android:id="@+id/file_name"
    style="@style/fileChooserName"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
     />

错误:This tag and its children can be replaced by one <TextView/> and a compound drawable

我是Android新手,并不完全了解什么是错误.某种解决方案令人伤心,使其复合但却没有得到它.

我开始了ActivityB从ActivityA使用startActivity(intent),然后我开始CountDownTimer.现在暂停,我想结束ActivityB并ActivityA再次拥有前景.是否有可能阻止Activity另一个？

我是android的初学者,对于一个uny课程的项目,我们必须开发5个简单的应用程序,然后将它们"合并"在一起.所以你从一个Activity/ListView启动每个应用程序.所有应用程序都单独运行,但是当从列表视图运行一个应用程序时,我得到以下 *AsyncTask#1执行doinBackground()时发生错误; *

 @Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);


    reportarray= new ArrayList<String>();


    try {
        URL url = new URL("http://www.yr.no/sted/Sverige/Kronoberg/V%E4xj%F6/forecast.xml");
        AsyncTask task = new WeatherRetriever().execute(url);
    } catch (IOException ioe ) {
        ioe.printStackTrace();
    }
    adapter= new Adapter(this);
    setListAdapter(adapter);



}

这似乎是一个线程问题,这里是我使用的更多代码

private class WeatherRetriever extends AsyncTask<URL, Void, WeatherReport> {
    protected WeatherReport doInBackground(URL... urls) {
        try {
            return WeatherHandler.getWeatherReport(urls[0]);
        } catch (Exception e) {
            throw new RuntimeException(e);
        } 
    }

    protected void onProgressUpdate(Void... progress) {

    }

    protected void onPostExecute(WeatherReport result) {
        report …

我真的很沮丧这个错误.我几乎不可能找到.

代码很简单.我正在尝试使用导航抽屉.

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<FrameLayout
    android:id="@+id/main_frame"
    android:layout_width="match_parent"
    android:layout_height="match_parent" 
   />

<ListView
    android:id="@+id/navigationdrawer"
    android:layout_width="240dp"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    android:background="#111"
    android:divider="@android:color/transparent"
    android:dividerHeight="0dp" />

要向ListView添加项目,我添加了一个字符串数组和string.xml

<resources>

<string name="app_name">Test</string>
<string name="action_settings">Settings</string>
<string name="hello_world">Hello world!</string>

<string-array name="Contents">
    <item>Calculator</item>
    <item>About Us</item>
</string-array>

</resources>

然后在MainActivity.java中

import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class MainActivity extends Activity {

String[] drawerListItems;
ListView drawerList;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    drawerListItems = getResources().getStringArray(R.array.Contents);
    drawerList = (ListView) findViewById(R.id.navigationdrawer);
    ArrayAdapter<String> aa = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,drawerListItems);
    drawerList.setAdapter(aa);
    setContentView(R.layout.navigation);
} …

我似乎无法Activity从我开始新的Button,我在这里寻找答案,但似乎无法解决问题.我希望有人有一个简单的解决方案.提前致谢.

这是错误:

E/AndroidRuntime? FATAL EXCEPTION: main
java.lang.IllegalStateException: Could not find a method openSearch(View) in the 
activity class dk.mathias.splitcab.MainActivity 
for onClick handler on view class android.widget.Button with id 'btnStartSearch'

MainActivity.java

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

}

public void openSearch(){
    Intent openSearchIntent = new Intent(MainActivity.this, StartSearch.class);
    startActivity(openSearchIntent);
}

AndroidManifest.xml中

    <activity
        android:name=".StartSearch"
        android:label="@string/title_activity_start_search" >
        <intent-filter>
            <action android:name="dk.mathias.splitcab.STARTSEARCH" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>

activity_main.xml中

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/StartSearch"
    android:id="@+id/btnStartSearch"
    android:layout_alignParentBottom="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_alignRight="@+id/tvWelcome"
    android:layout_alignEnd="@+id/tvWelcome"
    android:onClick="openSearch"

    />

StartSearch.java …

我在运行HttpGet时遇到问题，我可以使用模拟器的浏览器访问该站点，但是当我尝试运行我的应用程序时，出现了这些错误。

12-15 05:34:20.573    1702-1702/com.albertoortega.flordemaria E/AndroidRuntime? FATAL EXCEPTION: main
    android.os.NetworkOnMainThreadException
            at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
            at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
            at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
            at libcore.io.IoBridge.connect(IoBridge.java:112)
            at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
            at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
            at java.net.Socket.connect(Socket.java:842)
            at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
            at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
            at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
            at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
            at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
            at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
            at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
            at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
            at com.albertoortega.flordemaria.Objects.JSONParser.makeHttpRequest(JSONParser.java:65)
            at com.albertoortega.flordemaria.ActivityLogin$GetLogin$1.run(ActivityLogin.java:98)
            at android.os.Handler.handleCallback(Handler.java:725)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5041)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
            at dalvik.system.NativeStart.main(Native Method)

这是实际的代码。

new GetLogin().execute();

class GetLogin extends AsyncTask<String, String, String> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog …

class GetDetails extends AsyncTask<String, String, String> {

            @Override
            protected void onPreExecute() {
                super.onPreExecute();
                pDialog = new ProgressDialog(EditProduct.this);
                pDialog.setMessage("Chargement. Patienter ...");
                pDialog.setIndeterminate(false);
                pDialog.setCancelable(true);
                pDialog.show();
            }


            protected String doInBackground(String... params) {


                runOnUiThread(new Runnable() {
                    public void run() {

                        int success;
                        try {

                            List<NameValuePair> params = new ArrayList<NameValuePair>();
                            params.add(new BasicNameValuePair("pid", pid));


                            JSONObject json = jsonParser.makeHttpRequest(
                                    url_product_detials, "GET", params);


                            Log.d("Single Product Details", json.toString());


                            success = json.getInt(TAG_SUCCESS);
                            if (success == 1) {

                                JSONArray productObj = json.getJSONArray(TAG_PRODUCT); 


                                JSONObject product = productObj.getJSONObject(0);


                                txtName = (EditText) findViewById(R.id.inputName);
                                txtLongi …