Android开源:Cockroach - 打不死的小强,永不crash的Android

aga0875 5年前
   <p>Language</p>    <ul>     <li><a href="/misc/goto?guid=4959737867196259451" rel="nofollow,noindex">English</a></li>     <li>[Chinese]</li>    </ul>    <h2>Cockroach</h2>    <p>打不死的小强,永不crash的Android。</p>    <p>android 开发中最怕的就是crash,好好的APP测试时没问题,一发布就各种crash,只能通过紧急发布hotfix来解决,但准备hotfix的时间可能很长,导致这段时间用户体验非常差,android中虽然可以通过设置 Thread.setDefaultUncaughtExceptionHandler来捕获所有线程的异常,但主线程抛出异常时仍旧会导致activity闪退,app进程重启。使用Cockroach后就可以保证不管怎样抛异常activity都不会闪退,app进程也不会重启。</p>    <h3>使用方式</h3>    <p>自定义Application继承自android的Application,并在Application中装载,越早初始化越好,可以在Aplication的onCreate中初始化,当然也可以根据需要在任意地方(不一定要在主线程)装载,在任意地方卸载。可以多次装载和卸载。</p>    <p>例如:</p>    <pre>  <code class="language-java">import android.app.Application;  import android.os.Handler;  import android.os.Looper;  import android.util.Log;  import android.widget.Toast;    /**   * Created by wanjian on 2017/2/14.   */    public class App extends Application {        @Override      public void onCreate() {          super.onCreate();            Cockroach.install(new Cockroach.ExceptionHandler() {               // handlerException内部建议手动try{  你的异常处理逻辑  }catch(Throwable e){ } ,以防handlerException内部再次抛出异常,导致循环调用handlerException                @Override              public void handlerException(final Thread thread, final Throwable throwable) {                  new Handler(Looper.getMainLooper()).post(new Runnable() {                      @Override                      public void run() {                          try {                              Log.e("AndroidRuntime","--->CockroachException:"+thread+"<---",throwable);                              Toast.makeText(App.this, "Exception Happend\n" + thread + "\n" + throwable.toString(), Toast.LENGTH_SHORT).show();  //                        throw new RuntimeException("..."+(i++));                          } catch (Throwable e) {                            }                      }                  });              }          });      }  }</code></pre>    <p>卸载 Cockroach</p>    <pre>  <code class="language-java">Cockroach.uninstall();</code></pre>    <h3>测试</h3>    <p>装载Cockroach后点击view抛出异常和new Handler中抛出异常</p>    <pre>  <code class="language-java">final TextView textView = (TextView) findViewById(R.id.text);          findViewById(R.id.install).setOnClickListener(new View.OnClickListener() {              @Override              public void onClick(View v) {                  textView.setText("已安装 Cockroach");                  install();              }          });            findViewById(R.id.uninstall).setOnClickListener(new View.OnClickListener() {              @Override              public void onClick(View v) {                  textView.setText("已卸载 Cockroach");                  Cockroach.uninstall();              }          });            findViewById(R.id.but1).setOnClickListener(new View.OnClickListener() {              @Override              public void onClick(View v) {                  throw new RuntimeException("click exception...");              }          });            findViewById(R.id.but2).setOnClickListener(new View.OnClickListener() {              @Override              public void onClick(View v) {                  new Handler().post(new Runnable() {                      @Override                      public void run() {                          throw new RuntimeException("handler exception...");                      }                  });              }          });            findViewById(R.id.but3).setOnClickListener(new View.OnClickListener() {              @Override              public void onClick(View v) {                  new Thread() {                      @Override                      public void run() {                          super.run();                          throw new RuntimeException("new thread exception...");                      }                  }.start();              }          });            findViewById(R.id.but4).setOnClickListener(new View.OnClickListener() {              @Override              public void onClick(View v) {                  startActivity(new Intent(getApplicationContext(), SecActivity.class));              }          });        }        private void install() {          Cockroach.install(new Cockroach.ExceptionHandler() {              @Override              public void handlerException(final Thread thread, final Throwable throwable) {                    Log.d("Cockroach", "MainThread: " + Looper.getMainLooper().getThread() + "  curThread: " + Thread.currentThread());                    new Handler(Looper.getMainLooper()).post(new Runnable() {                      @Override                      public void run() {                          try {                                Log.e("AndroidRuntime","--->CockroachException:"+thread+"<---",throwable);                              Toast.makeText(getApplicationContext(), "Exception Happend\n" + thread + "\n" + throwable.toString(), Toast.LENGTH_SHORT).show();  //                        throw new RuntimeException("..."+(i++));                          } catch (Throwable e) {                            }                      }                  });              }          });      }</code></pre>    <p>捕获到的堆栈如下,可以看到都已经被 at com.wanjian.cockroach.Cockroach$1.run(Cockroach.java:47) 拦截,APP没有任何影响,没有闪退,也没有重启进程</p>    <pre>  <code class="language-java">02-16 09:58:00.660 21199-21199/wj.com.fuck E/AndroidRuntime: --->CockroachException:Thread[main,5,main]<---                                                               java.lang.RuntimeException: click exception...                                                                   at wj.com.fuck.MainActivity$3.onClick(MainActivity.java:53)                                                                   at android.view.View.performClick(View.java:4909)                                                                   at android.view.View$PerformClick.run(View.java:20390)                                                                   at android.os.Handler.handleCallback(Handler.java:815)                                                                   at android.os.Handler.dispatchMessage(Handler.java:104)                                                                   at android.os.Looper.loop(Looper.java:194)                                                                   at com.wanjian.cockroach.Cockroach$1.run(Cockroach.java:47)                                                                   at android.os.Handler.handleCallback(Handler.java:815)                                                                   at android.os.Handler.dispatchMessage(Handler.java:104)                                                                   at android.os.Looper.loop(Looper.java:194)                                                                   at android.app.ActivityThread.main(ActivityThread.java:5826)                                                                   at java.lang.reflect.Method.invoke(Native Method)                                                                   at java.lang.reflect.Method.invoke(Method.java:372)                                                                   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1009)                                                                   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:804)  02-16 09:58:12.401 21199-21199/wj.com.fuck E/AndroidRuntime: --->CockroachException:Thread[main,5,main]<---                                                               java.lang.RuntimeException: handler exception...                                                                   at wj.com.fuck.MainActivity$4$1.run(MainActivity.java:63)                                                                   at android.os.Handler.handleCallback(Handler.java:815)                                                                   at android.os.Handler.dispatchMessage(Handler.java:104)                                                                   at android.os.Looper.loop(Looper.java:194)                                                                   at com.wanjian.cockroach.Cockroach$1.run(Cockroach.java:47)                                                                   at android.os.Handler.handleCallback(Handler.java:815)                                                                   at android.os.Handler.dispatchMessage(Handler.java:104)                                                                   at android.os.Looper.loop(Looper.java:194)                                                                   at android.app.ActivityThread.main(ActivityThread.java:5826)                                                                   at java.lang.reflect.Method.invoke(Native Method)                                                                   at java.lang.reflect.Method.invoke(Method.java:372)                                                                   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1009)                                                                   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:804)  02-16 09:58:13.241 21199-21199/wj.com.fuck E/AndroidRuntime: --->CockroachException:Thread[Thread-26326,5,main]<---                                                               java.lang.RuntimeException: new thread exception...                                                                   at wj.com.fuck.MainActivity$5$1.run(MainActivity.java:76)</code></pre>    <p>当卸载 Cockroach 后再在click中抛出异常,日志如下</p>    <pre>  <code class="language-java">02-16 09:59:01.251 21199-21199/wj.com.fuck E/AndroidRuntime: FATAL EXCEPTION: main                                                               Process: wj.com.fuck, PID: 21199                                                               java.lang.RuntimeException: click exception...                                                                   at wj.com.fuck.MainActivity$3.onClick(MainActivity.java:53)                                                                   at android.view.View.performClick(View.java:4909)                                                                   at android.view.View$PerformClick.run(View.java:20390)                                                                   at android.os.Handler.handleCallback(Handler.java:815)                                                                   at android.os.Handler.dispatchMessage(Handler.java:104)                                                                   at android.os.Looper.loop(Looper.java:194)                                                                   at android.app.ActivityThread.main(ActivityThread.java:5826)                                                                   at java.lang.reflect.Method.invoke(Native Method)                                                                   at java.lang.reflect.Method.invoke(Method.java:372)                                                                   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1009)                                                                   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:804)</code></pre>    <p>可以看到 at com.wanjian.cockroach.Cockroach$1.run(Cockroach.java:47) 没有拦截,并且APP crash了。</p>    <h3>注意</h3>    <ul>     <li> <p>当主线程或子线程抛出异常时都会调用exceptionHandler.handlerException(Thread thread, Throwable throwable)</p> </li>     <li> <p>exceptionHandler.handlerException可能运行在非UI线程中。</p> </li>     <li> <p>handlerException内部建议手动try{ 你的异常处理逻辑 }catch(Throwable e){ } ,以防handlerException内部再次抛出异常,导致循环调用handlerException</p> </li>     <li> <p>若设置了Thread.setDefaultUncaughtExceptionHandler则可能无法捕获子线程异常。</p> </li>    </ul>    <p>虽然可以捕获到所有异常,但可能会导致一些莫名其妙的问题,比如view初始化时发生了异常,异常后面的代码得不到执行,虽然不 会导致app crash但view内部已经出现了问题,运行时就会出现很奇葩的现象。再比如activity声明周期方法中抛出了异常,则生 命周期就会不完整,从而导致各种奇葩的现象。</p>    <p>虽然会导致各种奇葩问题发生,但可以最大程度的保证APP正常运行,很多时候我们希望主线程即使抛出异常也不影响app的正常使用,比如我们 给某个view设置背景色时,由于view是null就会导致app crash,像这种问题我们更希望即使view没法设置颜色也不要crash,这 时Cockroach就可以满足你的需求。</p>    <p>handlerException(final Thread thread, final Throwable throwable)内部建议请求自己服务器决定该如何处理该异常,是 直接忽略还是杀死APP又或者其他操作。</p>    <p>Cockroach采用android标准API编写,无依赖,足够轻量,轻量到只有不到100行代码,一般不会存在兼容性问题,也不存在性能上的问题,可以兼容所有android版本。</p>    <p> </p>