android - 窃听 twitter android 应用程序。不会崩溃，但不会打印任何内容。请帮忙!

Question

我的 android 应用程序应该使用 twitter4j 库通过 twitter，并返回一堆包含您搜索的关键字的推文。该应用程序不会像以前那样崩溃，但它也会以某种方式出现错误，导致无法打印任何内容。

代码如下:

package com.SMARTlab.twitterapp;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import twitter4j.*;

public class TwitterApp extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button search = (Button)findViewById(R.id.search_button);
        search.setOnClickListener(search_OnClickListener);
    }
    public void onClick(View v)
    {
        switch (v.getId())
        {
        case R.id.search_button:
            Intent i = new Intent(this, com.SMARTlab.twitterapp.TwitterApp.class);
            startActivity(i);
            break;

        }
    }

    @SuppressWarnings("deprecation")
    private Button.OnClickListener search_OnClickListener = new Button.OnClickListener()
    {
        @Override 
        public void onClick(View v)
        {
            Twitter t = new TwitterFactory().getInstance();
            EditText ed = (EditText)findViewById(R.id.search_box);
        TextView txt = (TextView)findViewById(R.id.text_box);
        Query q = new Query(ed.getText().toString());
        QueryResult res = null;
        try
        {
            res = t.search(q);
            txt.setText("");

        }
        catch(TwitterException ex) {System.out.println(ex.toString());}
        for (Tweet tw : res.getTweets())
        {
            try
            {
                long[] id = t.getRetweetedByIDs(tw.getId()).getIDs();
                for (int x = 0; x < id.length; x++)
                    queryRank += 1;
            } catch(TwitterException te) {}
            if (evaluateRank(queryRank))
            {
                txt.append((String)"[" + tw.getFromUser() + "] " + tw.getText() + "\n");
                }
            }

        }
        int queryRank = 0;
        private boolean evaluateRank(int rank)
        {
            if (rank > 10)
                return true;
            return false;
        }
    };
}

以下是 AndroidMnifest.xml 文件的内容，以备不时之需:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.SMARTlab.twitterapp"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="8" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".TwitterApp"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

</application>

这是 LogCat:

06-13 09:35:42.036: DEBUG/AndroidRuntime(425): >>>>>>>>>>>>>> AndroidRuntime START <<<<<<<<<<<<<<
06-13 09:35:42.036: DEBUG/AndroidRuntime(425): CheckJNI is ON
06-13 09:35:42.255: DEBUG/AndroidRuntime(425): --- registering native functions ---
06-13 09:35:43.076: DEBUG/AndroidRuntime(425): Shutting down VM
06-13 09:35:43.076: DEBUG/dalvikvm(425): Debugger has detached; object registry had 1 entries
06-13 09:35:43.116: INFO/AndroidRuntime(425): NOTE: attach of thread 'Binder Thread #3' failed
06-13 09:35:43.625: DEBUG/AndroidRuntime(433): >>>>>>>>>>>>>> AndroidRuntime START <<<<<<<<<<<<<<
06-13 09:35:43.635: DEBUG/AndroidRuntime(433): CheckJNI is ON
06-13 09:35:43.855: DEBUG/AndroidRuntime(433): --- registering native functions ---
06-13 09:35:44.645: INFO/ActivityManager(59): Starting activity: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.SMARTlab.twitterapp/.TwitterApp }
06-13 09:35:44.705: INFO/ActivityManager(59): Start proc com.SMARTlab.twitterapp for activity com.SMARTlab.twitterapp/.TwitterApp: pid=439 uid=10040 gids={}
06-13 09:35:44.755: DEBUG/AndroidRuntime(433): Shutting down VM
06-13 09:35:44.765: DEBUG/dalvikvm(433): Debugger has detached; object registry had 1 entries
06-13 09:35:44.825: INFO/AndroidRuntime(433): NOTE: attach of thread 'Binder Thread #3' failed
06-13 09:35:46.026: INFO/ActivityManager(59): Displayed activity     com.SMARTlab.twitterapp/.TwitterApp: 1329 ms (total 1329 ms)
06-13 09:35:51.135: DEBUG/dalvikvm(123): GC_EXPLICIT freed 230 objects / 9920 bytes in 75ms
06-13 09:36:51.735: WARN/KeyCharacterMap(439): No keyboard for id 0
06-13 09:36:51.735: WARN/KeyCharacterMap(439): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
06-13 09:36:57.306: INFO/System.out(439): Permission deniedRelevant discussions can be on the Internet at:
06-13 09:36:57.306: INFO/System.out(439):     http://www.google.co.jp/search?q=d35baff5 or
06-13 09:36:57.316: INFO/System.out(439):     http://www.google.co.jp/search?q=08a954d5
06-13 09:36:57.316: INFO/System.out(439): TwitterException{exceptionCode=[d35baff5-08a954d5 43208640-0c814192], statusCode=-1, retryAfter=-1, rateLimitStatus=null, featureSpecificRateLimitStatus=null, version=2.2.3}
06-13 09:36:57.316: DEBUG/AndroidRuntime(439): Shutting down VM
06-13 09:36:57.326: WARN/dalvikvm(439): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
06-13 09:36:57.336: ERROR/AndroidRuntime(439): FATAL EXCEPTION: main
06-13 09:36:57.336: ERROR/AndroidRuntime(439): java.lang.NullPointerException
06-13 09:36:57.336: ERROR/AndroidRuntime(439):     at com.SMARTlab.twitterapp.TwitterApp$1.onClick(TwitterApp.java:50)
06-13 09:36:57.336: ERROR/AndroidRuntime(439):     at android.view.View.performClick(View.java:2408)
06-13 09:36:57.336: ERROR/AndroidRuntime(439):     at android.view.View$PerformClick.run(View.java:8816)
06-13 09:36:57.336: ERROR/AndroidRuntime(439):     at android.os.Handler.handleCallback(Handler.java:587)
06-13 09:36:57.336: ERROR/AndroidRuntime(439):     at android.os.Handler.dispatchMessage(Handler.java:92)
06-13 09:36:57.336: ERROR/AndroidRuntime(439):     at android.os.Looper.loop(Looper.java:123)
06-13 09:36:57.336: ERROR/AndroidRuntime(439):     at android.app.ActivityThread.main(ActivityThread.java:4627)
06-13 09:36:57.336: ERROR/AndroidRuntime(439):     at java.lang.reflect.Method.invokeNative(Native Method)
06-13 09:36:57.336: ERROR/AndroidRuntime(439):     at java.lang.reflect.Method.invoke(Method.java:521)
06-13 09:36:57.336: ERROR/AndroidRuntime(439):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
06-13 09:36:57.336: ERROR/AndroidRuntime(439):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
06-13 09:36:57.336: ERROR/AndroidRuntime(439):     at dalvik.system.NativeStart.main(Native Method)
06-13 09:36:57.356: WARN/ActivityManager(59):   Force finishing activity com.SMARTlab.twitterapp/.TwitterApp
06-13 09:36:57.875: WARN/ActivityManager(59): Activity pause timeout for HistoryRecord{45050718 com.SMARTlab.twitterapp/.TwitterApp}
06-13 09:37:00.995: INFO/Process(439): Sending signal. PID: 439 SIG: 9
06-13 09:37:01.015: INFO/ActivityManager(59): Process com.SMARTlab.twitterapp (pid 439) has died.
06-13 09:37:01.015: INFO/WindowManager(59): WIN DEATH: Window{4503edf8 com.SMARTlab.twitterapp/com.SMARTlab.twitterapp.TwitterApp paused=false}
06-13 09:37:01.085: WARN/InputManagerService(59): Got RemoteException sending setActive(false) notification to pid 439 uid 10040

求助!预先感谢您的回答! :)

Answer 1

您不应该只捕获 NullPointerExceptions 和 TwitterExceptions 然后在您的 catch block 中什么都不做。很可能你的代码失败了，而你所做的一切都是为了防止原因被报告。删除捕获和抑制这些异常的 try/catch block ，然后找出导致它们被抛出的原因。我猜想，一旦您解决了这些异常的根本原因，事情就会开始起作用。