CrashCatcher.java

/*
 * Copyright (C) 2013 Jorrit "Chainfire" Jongma
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package eu.chainfire.geolog;

import java.io.FileOutputStream;
import java.io.IOException;

public class CrashCatcher implements Thread.UncaughtExceptionHandler {
	public static final String FILE_TRACE = Application.SDCARD_PATH + "/trace";
	
	private Thread.UncaughtExceptionHandler oldHandler;

	public CrashCatcher() {
		if (BuildConfig.DEBUG) {
			oldHandler = Thread.getDefaultUncaughtExceptionHandler();						
			Thread.setDefaultUncaughtExceptionHandler(this);
		}
	}
	
	@Override
	public void uncaughtException(Thread thread, Throwable ex) {
		try {
			StackTraceElement[] arr = ex.getStackTrace();

			String report =	ex.toString() + "\n\n";
			report += "--------- Stack trace ---------\n\n"; 
			report += thread.toString() + "\n\n";
			for (int i=0; i<arr.length; i++) {
				report += "    " + arr[i].toString() + "\n";
			}
			report += "-------------------------------\n\n";

			report += "--------- Cause ---------\n\n";
			Throwable cause = ex.getCause();
			if(cause != null) {
				report += cause.toString() + "\n\n";
				arr = cause.getStackTrace();
				for (int i=0; i<arr.length; i++) {
					report += "    " + arr[i].toString() + "\n";
				}
			}
			report += "-------------------------------\n\n";

			try {
				FileOutputStream trace = new FileOutputStream(FILE_TRACE, true);
				trace.write(report.getBytes());
				trace.close();
			} catch(IOException ioe) {
			}
		} catch (Exception e) {			
		}
		
		if (oldHandler != null)	oldHandler.uncaughtException(thread, ex);
	}
}