遇到軟體沒有捕獲的異常之後，系統會彈出這個預設的強制關閉對話方塊。
我們當然不希望使用者看到這種現象，簡直是對使用者心靈上的打擊，而且對我們的bug的修復也是毫無幫助的。我們需要的是軟體有一個全域性的異常捕獲器，當出現一個我們沒有發現的異常時，捕獲這個異常，並且將異常資訊記錄下來，上傳到伺服器公開發這分析出現異常的具體原因

 /** 
 * UncaughtException處理類,當程式發生Uncaught異常的時候,有該類來接管程式,並記錄傳送錯誤報告. 
 */ 
public class Mapp extends Application{
    private static Context mContext;
    @Override
 

    public void onCreate() {
        super.onCreate();
        this.mContext = this;
        CrashHandler.getInstance().init(this);//初始化全域性異常管理
    }
    public static Context getContext(){
        return mContext;
    }
}

CrashHandler 實現類如下

import android.content.Context;
import android.os.Environment;
import
 
 android.util.Log;
import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.util.HashMap;
import java.util.Map;

/**
 * 1. 類的用途
 * 2. @author BeaHug
 * 3. @date 2017/9/20 16:53
 */

public class CrashHandler implements
 
 Thread.UncaughtExceptionHandler {
    private Context mContext;
    /**
     * 系統預設UncaughtExceptionHandler
     */
    private Thread.UncaughtExceptionHandler mDefaultHandler;
    /**
     * 儲存異常和引數資訊
     */
    private Map<String, String> paramsMap = new HashMap<>();

    private static CrashHandler mInstance;
     /**
     * 獲取CrashHandler例項
     */
    public static synchronized CrashHandler getInstance() {
        if (null == mInstance) {
            mInstance = new CrashHandler();
        }
        return mInstance;
    }

    public void init(Context context) {
        mContext = context;
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        //設定該CrashHandler為系統預設的
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    @Override
    public void uncaughtException(Thread thread, Throwable throwable) {
        handleException(throwable);
    }

    private boolean handleException(Throwable ex) {
        if (ex == null) {
            return false;
        }
        saveCrashInfo2File(ex);
        return true;
    }

    private String saveCrashInfo2File(Throwable ex) {

        StringBuffer sb = new StringBuffer();
        for (Map.Entry<String, String> entry : paramsMap.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            sb.append(key + "=" + value + "\n");
        }

        Writer writer = new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        ex.printStackTrace(printWriter);
        Throwable cause = ex.getCause();
        while (cause != null) {
            cause.printStackTrace(printWriter);
            cause = cause.getCause();
        }
        printWriter.close();
        String result = writer.toString();
        sb.append(result);
        try {
            String timestamp = "catcherror";
            // String time = format.format(new Date());
            String fileName = timestamp + ".log";
            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                String path = Environment.getExternalStorageDirectory() + "/sdcard/";
                File dir = new File(path);
                if (!dir.exists()) {
                    dir.mkdirs();
                }
                FileOutputStream fos = new FileOutputStream(path + fileName);
                fos.write(sb.toString().getBytes());
                fos.close();
            }
            return fileName;
        } catch (Exception e) {
            Log.e("", "an error occured while writing file...", e);
        }
        return null;
    }
}

只能將異常存到SD中,不能上傳伺服器
請點評…