Android小技巧 Part III——How to get

Android开发遇到程序crash时，常常无法看到log，给开发调试带来了不小的困难，通过下面的简单方法，可以有效的获取log并输出出来（通过Logcat、日志文件等等）。

自定义ExceptionHandler，继承Thread.UncaughtExceptionHandler

public class TopExceptionHandler implements Thread.UncaughtExceptionHandler {

    private Thread.UncaughtExceptionHandler defaultUEH;

    private Activity app = null;

    public TopExceptionHandler(Activity app) {
        this.defaultUEH = Thread.getDefaultUncaughtExceptionHandler();
        this.app = app;
    }

    public void uncaughtException(Thread t, Throwable e) {
        StackTraceElement[] arr = e.getStackTrace();
        String report = e.toString() + "\n\n";
        report += "--------- Stack trace ---------\n\n";
        for (int i = 0; i < arr.length; i++) {
            report += "    " + arr[i].toString() + "\n";
        }
        report += "-------------------------------\n\n";
        //输出到LogCat
        Log.e("XXX",report);
        //输出到其他
        //TODO;
        defaultUEH.uncaughtException(t, e);
    }
}

在Activity中使用Handler

@Override
public void onCreate(Bundle savedInstanceState)
{
  super.onCreate(savedInstanceState);
  Thread.setDefaultUncaughtExceptionHandler(new TopExceptionHandler(this));
  //TODO;
  //……
}