Android使用UncaughtExceptionHandler捕获全局异常

野性酷女 2022-08-07 08:37 250阅读 0赞

最近使用的异常捕获案例：

package net.zdsoft.eis.android.system.activity;
    
    import java.io.PrintWriter;
    import java.io.StringWriter;
    import java.lang.Thread.UncaughtExceptionHandler;
    import java.util.HashMap;
    import java.util.Locale;
    import java.util.Map;
    import java.util.concurrent.CountDownLatch;
    
    import net.zdsoft.andframe.blue.entity.WebsiteConfig;
    import net.zdsoft.andframe.blue.model.WebsiteConfigModel;
    import net.zdsoft.andframe.green.db.helper.DBHelper;
    import net.zdsoft.andframe.green.util.HttpUtils;
    import net.zdsoft.andframe.green.util.ToastUtils;
    import net.zdsoft.eis.android.R;
    import net.zdsoft.eis.android.system.constants.Constants;
    import net.zdsoft.eis.android.system.model.LoginConfig;
    
    import org.apache.commons.io.IOUtils;
    
    import android.app.Application;
    import android.content.res.Configuration;
    import android.content.res.Resources;
    import android.os.Looper;
    import android.util.DisplayMetrics;
    import android.util.Log;
    
    /**
     * 安卓程序的真正入口点，代表整个应用的实例
     */
    public class App extends Application {
    
        // 系统默认异常处理handler
        private UncaughtExceptionHandler defaultUncaughtExceptionHandler;
        private LoginConfig loginConfig;
    
        @Override
        public void onCreate() {
            super.onCreate();
    
            // android2.2不支持IpV6，以防止android2.2下mina报错
            System.setProperty("java.net.preferIPv6Addresses", "false");
    
            Resources resources = getResources();// 获得res资源对象
            Configuration config = resources.getConfiguration();// 获得设置对象
            DisplayMetrics dm = resources.getDisplayMetrics();// 获得屏幕参数：主要是分辨率，像素等。
            config.locale = Locale.SIMPLIFIED_CHINESE; // 简体中文
            resources.updateConfiguration(config, dm);
    
            // 初始化数据库版本号
            DBHelper.init(Integer.valueOf(getString(R.string.database_version)),getString(R.string.database_name));
            Log.d(Constants.TAG, "application init");
    
            defaultUncaughtExceptionHandler = Thread.getDefaultUncaughtExceptionHandler();
    
            UncaughtExceptionHandler handler = new UncaughtExceptionHandler() {
                @Override
                public void uncaughtException(Thread t, Throwable e) {
                    if (!handleException(e) && defaultUncaughtExceptionHandler != null) {
                        // 如果用户没有处理则让系统默认的异常处理器来处理
                        defaultUncaughtExceptionHandler.uncaughtException(t, e);
                    }
                    else {
                        try {
                            Thread.sleep(2000);
                        }
                        catch (InterruptedException e1) {
                        }
    
                        // 退出程序
                        android.os.Process.killProcess(android.os.Process.myPid());
                        System.exit(1);
                    }
                }
    
                /**
                 * 用户试图自己处理异常
                 * 
                 * @return 处理true，不处理false
                 */
                private boolean handleException(final Throwable e) {
                    if (e == null) {
                        return false;
                    }
    
                    Log.e(Constants.TAG, "检测到严重错误，程序即将退出", e);
    
    //                final CountDownLatch latch = new CountDownLatch(1);
    //                new Thread() {
    //                    @Override
    //                    public void run() {
    //                        WebsiteConfigModel websiteConfigModel = new WebsiteConfigModel(getApplicationContext());
    //                        String regionId = loginConfig.getLastLoginRegionId();
    //                        WebsiteConfig w = websiteConfigModel.getWebsiteConfig(regionId);
    //                        Map<String, String> map = new HashMap<String, String>();
    //                        StringWriter str = new StringWriter();
    //                        PrintWriter out = new PrintWriter(str);
    //                        e.printStackTrace(out);
    //                        out.flush();
    //                        map.put("username", str.getBuffer().toString());
    //                        IOUtils.closeQuietly(out);
    //                        
    //						if (w != null) {
    //							HttpUtils.requestURLPost(w.getUrl()
    //									+ "/android/recordError.action", map, "");
    //						} 
    //
    //                        Looper.prepare();
    //                        ToastUtils.displayTextLong(getApplicationContext(), "很抱歉,程序出现异常,即将退出并重启.");
    //                        latch.countDown();
    //                        Looper.loop();
    //                    }
    //                }.start();
    //
    //                try {
    //                    // 等待，直到记录错误信息的线程完成再执行
    //                    latch.await();
    //                    Thread.sleep(2000);
    //                }
    //                catch (InterruptedException e1) {
    //                    // Ignore
    //                }
    
                    return false;
                }
            };
    
            // 设置线程异常处理
            Thread.setDefaultUncaughtExceptionHandler(handler);
            
            loginConfig = new LoginConfig(getApplicationContext());
        }
    
        @Override
        public void onConfigurationChanged(Configuration newConfig) {
            super.onConfigurationChanged(newConfig);
        }
    
        @Override
        public void onTerminate() {
            Log.d(Constants.TAG, "application onTerminate");
            super.onTerminate();
        }
    
        @Override
        public void onLowMemory() {
            super.onLowMemory();
        }
    
    }

资料相关解释：

Android系统的“程序异常退出”，给应用的用户体验造成不良影响。为了捕获应用运行时异常并给出友好提示，便可继承[UncaughtExceptionHandler][]类来处理。通过Thread.setDefaultUncaughtExceptionHandler()方法将异常处理类设置到线程上即可。

**1、异常处理类，代码如下：**

public class CrashHandler implements UncaughtExceptionHandler {
        public static final String TAG = "CrashHandler";
        private static CrashHandler INSTANCE = new CrashHandler();
        private Context mContext;
        private Thread.UncaughtExceptionHandler mDefaultHandler;
    
        private CrashHandler() {
        }
    
        public static CrashHandler getInstance() {
            return INSTANCE;
        }
    
        public void init(Context ctx) {
            mContext = ctx;
            mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
            Thread.setDefaultUncaughtExceptionHandler(this);
        }
    
        @Override
        public void uncaughtException(Thread thread, Throwable ex) {
            // if (!handleException(ex) && mDefaultHandler != null) {
            // mDefaultHandler.uncaughtException(thread, ex);
            // } else {
            // android.os.Process.killProcess(android.os.Process.myPid());
            // System.exit(10);
            // }
            System.out.println("uncaughtException");
    
            new Thread() {
                @Override
                public void run() {
                    Looper.prepare();
                    new AlertDialog.Builder(mContext).setTitle("提示").setCancelable(false)
                            .setMessage("程序崩溃了...").setNeutralButton("我知道了", new OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int which) {
                                    System.exit(0);
                                }
                            })
                            .create().show();
                    Looper.loop();
                }
            }.start();
        }
    
        /**
         * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成. 开发者可以根据自己的情况来自定义异常处理逻辑
         *
         * @param ex
         * @return true:如果处理了该异常信息;否则返回false
         */
        private boolean handleException(Throwable ex) {
            if (ex == null) {
                return true;
            }
            // new Handler(Looper.getMainLooper()).post(new Runnable() {
            // @Override
            // public void run() {
            // new AlertDialog.Builder(mContext).setTitle("提示")
            // .setMessage("程序崩溃了...").setNeutralButton("我知道了", null)
            // .create().show();
            // }
            // });
    
            return true;
        }
    }

2、线程绑定异常处理类

public class CrashHandlerActivity extends Activity {
        /** Called when the activity is first created. */
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);
            CrashHandler crashHandler = CrashHandler.getInstance();  
            crashHandler.init(this);  //传入参数必须为Activity，否则AlertDialog将不显示。
            // 创建错误
            throw new NullPointerException();
        }
    }

参考内容如下：

Demo下载地址：http://code.google.com/p/android-custom-view/downloads/list

地址**:** [http://orgcent.com/android-uncaughtexceptionhandler-exception/ ][http_orgcent.com_android-uncaughtexceptionhandler-exception]

[UncaughtExceptionHandler]: http://orgcent.com/tag/UncaughtExceptionHandler/
[http_orgcent.com_android-uncaughtexceptionhandler-exception]: http://orgcent.com/android-uncaughtexceptionhandler-exception/