java - Android 应用程序在模拟器中运行但在设备中失败

Question

我的 Android 应用程序在模拟器中运行良好，但是当我安装 .apk 并运行时，它说“不幸的是‘应用程序’已停止”

这是 androidmanifest.xml

    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.android.baliweather"
    android:versionCode="1"
    android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="21" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity android:name=".Main"
              android:label="@string/app_name"
              android:theme="@android:style/Theme.NoTitleBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
     <activity android:name=".Prakiraan"
             android:label="@string/app_name"
             android:theme="@android:style/Theme.NoTitleBar">
    </activity>
    <activity android:name=".Update"
             android:label="@string/app_name"
             android:theme="@android:style/Theme.NoTitleBar">
    </activity>
      <activity android:name=".Info"
             android:label="@string/app_name"
             android:theme="@android:style/Theme.NoTitleBar">
    </activity>
</application>

错误日志:

09-02 15:25:01.372: E/AndroidRuntime(16394): FATAL EXCEPTION: main 09-02 15:25:01.372: E/AndroidRuntime(16394): android.os.NetworkOnMainThreadException 09-02 15:25:01.372: E/AndroidRuntime(16394): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1133) 09-02 15:25:01.372: E/AndroidRuntime(16394): at libcore.io.BlockGuardOs.recvfrom(BlockGuardOs.java:163) 09-02 15:25:01.372: E/AndroidRuntime(16394): at libcore.io.IoBridge.recvfrom(IoBridge.java:519) 09-02 15:25:01.372: E/AndroidRuntime(16394): at java.net.PlainSocketImpl.read(PlainSocketImpl.java:489) 09-02 15:25:01.372: E/AndroidRuntime(16394): at java.net.PlainSocketImpl.access$000(PlainSocketImpl.java:46) 09-02 15:25:01.372: E/AndroidRuntime(16394): at java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:241) 09-02 15:25:01.372: E/AndroidRuntime(16394): at java.io.InputStream.read(InputStream.java:163) 09-02 15:25:01.372: E/AndroidRuntime(16394): at java.io.BufferedInputStream.fillbuf(BufferedInputStream.java:142) 09-02 15:25:01.372: E/AndroidRuntime(16394): at java.io.BufferedInputStream.read(BufferedInputStream.java:227) 09-02 15:25:01.372: E/AndroidRuntime(16394): at libcore.io.Streams.readAsciiLine(Streams.java:201) 09-02 15:25:01.372: E/AndroidRuntime(16394): at libcore.net.http.HttpEngine.readResponseHeaders(HttpEngine.java:579) 09-02 15:25:01.372: E/AndroidRuntime(16394): at libcore.net.http.HttpEngine.readResponse(HttpEngine.java:827) 09-02 15:25:01.372: E/AndroidRuntime(16394): at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:283) 09-02 15:25:01.372: E/AndroidRuntime(16394): at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:177) 09-02 15:25:01.372: E/AndroidRuntime(16394): at java.net.URL.openStream(URL.java:462) 09-02 15:25:01.372: E/AndroidRuntime(16394): at com.android.baliweather.MyParser.xmlParsing(MyParser.java:43) 09-02 15:25:01.372: E/AndroidRuntime(16394): at com.android.baliweather.Prakiraan$MyAsyncTask.onPostExecute(Prakiraan.java:60) 09-02 15:25:01.372: E/AndroidRuntime(16394): at com.android.baliweather.Prakiraan$MyAsyncTask.onPostExecute(Prakiraan.java:1) 09-02 15:25:01.372: E/AndroidRuntime(16394): at android.os.AsyncTask.finish(AsyncTask.java:631) 09-02 15:25:01.372: E/AndroidRuntime(16394): at android.os.AsyncTask.access$600(AsyncTask.java:177) 09-02 15:25:01.372: E/AndroidRuntime(16394): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644) 09-02 15:25:01.372: E/AndroidRuntime(16394): at android.os.Handler.dispatchMessage(Handler.java:99) 09-02 15:25:01.372: E/AndroidRuntime(16394): at android.os.Looper.loop(Looper.java:137) 09-02 15:25:01.372: E/AndroidRuntime(16394): at android.app.ActivityThread.main(ActivityThread.java:5214) 09-02 15:25:01.372: E/AndroidRuntime(16394): at java.lang.reflect.Method.invokeNative(Native Method) 09-02 15:25:01.372: E/AndroidRuntime(16394): at java.lang.reflect.Method.invoke(Method.java:525) 09-02 15:25:01.372: E/AndroidRuntime(16394): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739) 09-02 15:25:01.372: E/AndroidRuntime(16394): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555) 09-02 15:25:01.372: E/AndroidRuntime(16394): at dalvik.system.NativeStart.main(Native Method)

Answer 1

 android.os.NetworkOnMainThreadException

非常不言自明，对吧？您正在 UI 线程上执行网络任务(HTTP 请求等)。您应该在单独的线程中运行它。

    private class LongOperation extends AsyncTask<String, Void, String> {

        @Override
        protected String doInBackground(String... params) {
            for (int i = 0; i < 5; i++) {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    Thread.interrupted();
                }
            }
            return "Executed";
        }

        @Override
        protected void onPostExecute(String result) {
            TextView txt = (TextView) findViewById(R.id.output);
            txt.setText("Executed"); // txt.setText(result);
            // might want to change "executed" for the returned string passed
            // into onPostExecute() but that is upto you
        }

        @Override
        protected void onPreExecute() {}

        @Override
        protected void onProgressUpdate(Void... values) {}
    }

上面是一个例子。

使其成为您 Activity 的内部类