android 應用程式異常崩潰捕捉
阿新 • • 發佈:2019-02-01
- import java.io.BufferedReader;
- import java.io.File;
- import java.io.FileInputStream;
- import java.io.FileNotFoundException;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.io.InputStreamReader;
- import java.io.PrintWriter;
- import java.io.StringWriter;
- import java.io.Writer;
- import java.lang.Thread.UncaughtExceptionHandler;
- import java.lang.reflect.Field;
- import java.text.DateFormat;
- import java.text.SimpleDateFormat;
- import java.util.Date;
- import java.util.HashMap;
- import java.util.Map;
- import android.content.Context;
- import android.content.pm.PackageInfo;
- import
- import android.content.pm.PackageManager.NameNotFoundException;
- import android.os.Build;
- import android.os.Environment;
- import android.os.Looper;
- import android.util.Log;
- import android.widget.Toast;
- /**
- * 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.
- *
- * 需要在Application中註冊,為了要在程式啟動器就監控整個程式。
- */
- publicclass CrashHandler implements UncaughtExceptionHandler {
- publicstaticfinal String TAG = "CrashHandler";
- //系統預設的UncaughtException處理類
- private Thread.UncaughtExceptionHandler mDefaultHandler;
- //CrashHandler例項
- privatestatic CrashHandler instance;
- //程式的Context物件
- private Context mContext;
- //用來儲存裝置資訊和異常資訊
- private Map<String, String> infos = new HashMap<String, String>();
- //用於格式化日期,作為日誌檔名的一部分
- private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
- /** 保證只有一個CrashHandler例項 */
- private CrashHandler() {}
- /** 獲取CrashHandler例項 ,單例模式 */
- publicstatic CrashHandler getInstance() {
- if(instance == null)
- instance = new CrashHandler();
- return instance;
- }
- /**
- * 初始化
- */
- publicvoid init(Context context) {
- mContext = context;
- //獲取系統預設的UncaughtException處理器
- mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
- //設定該CrashHandler為程式的預設處理器
- Thread.setDefaultUncaughtExceptionHandler(this);
- }
- /**
- * 當UncaughtException發生時會轉入該函式來處理
- */
- @Override
- publicvoid uncaughtException(Thread thread, Throwable ex) {
- if (!handleException(ex) && mDefaultHandler != null) {
- //如果使用者沒有處理則讓系統預設的異常處理器來處理
- mDefaultHandler.uncaughtException(thread, ex);
- } else {
- try {
- Thread.sleep(3000);
- } catch (InterruptedException e) {
- Log.e(TAG, "error : ", e);
- }
- //退出程式
- android.os.Process.killProcess(android.os.Process.myPid());
- System.exit(1);
- }
- }
- /**
- * 自定義錯誤處理,收集錯誤資訊 傳送錯誤報告等操作均在此完成.
- *
- * @param ex
- * @return true:如果處理了該異常資訊;否則返回false.
- */
- privateboolean handleException(Throwable ex) {
- if (ex == null) {
- returnfalse;
- }
- //收集裝置引數資訊
- collectDeviceInfo(mContext);
- //使用Toast來顯示異常資訊
- new Thread() {
- @Override
- publicvoid run() {
- Looper.prepare();
- Toast.makeText(mContext, "很抱歉,程式出現異常,即將退出.", Toast.LENGTH_SHORT).show();
- Looper.loop();
- }
- }.start();
- //儲存日誌檔案
- saveCatchInfo2File(ex);
- returntrue;
- }
- /**
- * 收集裝置引數資訊
- * @param ctx
- */
- publicvoid collectDeviceInfo(Context ctx) {
- try {
- PackageManager pm = ctx.getPackageManager();
- PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);
- if (pi != null) {
- String versionName = pi.versionName == null ? "null" : pi.versionName;
- String versionCode = pi.versionCode + "";
- infos.put("versionName", versionName);
- infos.put("versionCode", versionCode);
- }
- } catch (NameNotFoundException e) {
- Log.e(TAG, "an error occured when collect package info", e);
- }
- Field[] fields = Build.class.getDeclaredFields();
- for (Field field : fields) {
- try {
- field.setAccessible(true);
- infos.put(field.getName(), field.get(null).toString());
- Log.d(TAG, field.getName() + " : " + field.get(null));
- } catch (Exception e) {
- Log.e(TAG, "an error occured when collect crash info", e);
- }
- }
- }
- /**
- * 儲存錯誤資訊到檔案中
- *
- * @param ex
- * @return 返回檔名稱,便於將檔案傳送到伺服器
- */
- private String saveCatchInfo2File(Throwable ex) {
- StringBuffer sb = new StringBuffer();
- for (Map.Entry<String, String> entry : infos.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 {
- long timestamp = System.currentTimeMillis();
- String time = formatter.format(new Date());
- String fileName = "crash-" + time + "-" + timestamp + ".log";
- if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
- String path = "/mnt/sdcard/crash/";
- File dir = new File(path);
- if (!dir.exists()) {
- dir.mkdirs();
- }
- FileOutputStream fos = new FileOutputStream(path + fileName);
- fos.write(sb.toString().getBytes());
- //傳送給開發人員
- sendCrashLog2PM(path+fileName);
- fos.close();
- }
- return fileName;
- } catch (Exception e) {
- Log.e(TAG, "an error occured while writing file...", e);
- }
- returnnull;
- }
- /**
- * 將捕獲的導致崩潰的錯誤資訊傳送給開發人員
- *
- * 目前只將log日誌儲存在sdcard 和輸出到LogCat中,並未傳送給後臺。
- */
- privatevoid sendCrashLog2PM(String fileName){
- if(!new File(fileName).exists()){
- Toast.makeText(mContext, "日誌檔案不存在!", Toast.LENGTH_SHORT).show();
- return;
- }
- FileInputStream fis = null;
- BufferedReader reader = null;
- String s = null;
- try {
- fis = new FileInputStream(fileName);
- reader = new BufferedReader(new InputStreamReader(fis, "GBK"));
- while(true){
- s = reader.readLine();
- if(s == null) break;
- //由於目前尚未確定以何種方式傳送,所以先打出log日誌。
- Log.i("info", s.toString());
- }
- } catch (FileNotFoundException e) {
- e.printStackTrace();
- } catch (IOException e) {
- e.printStackTrace();
- }finally{ // 關閉流
- try {
- reader.close();
- fis.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- }
- }
針對異常的捕捉要進行全域性監控整個專案,所以要將其在Application中註冊(也就是初始化):
[java] view plaincopyprint?- import android.app.Application;
- publicclass CrashApplication extends Application {
- @Override
- publicvoid onCreate() {
- super.onCreate();
- CrashHandler catchHandler = CrashHandler.getInstance();
- catchHandler.init(getApplicationContext());
- }
- }
現在模擬一個空指標異常: [java] view plaincopyprint?
- import android.app.Activity;
- import android.os.Bundle;
- publicclass CatchExceptionLogActivity extends Activity {
- /** Called when the activity is first created. */
- private String s;
- @Override
- publicvoid onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- System.out.println(s.equals("hello")); // s沒有進行賦值,所以會出現NullPointException異常
- }
- }
別忘了在配置檔案中對Application進行註冊: [html] view plaincopyprint?
- <?xmlversion="1.0"encoding="utf-8"?>
- <manifestxmlns:android="http://schemas.android.com/apk/res/android"
- package="com.forms.catchlog"
- android:versionCode="1"
- android:versionName="1.0">
- <uses-sdkandroid:minSdkVersion="8"/>
- <uses-permissionandroid:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
- <application
- android:icon="@drawable/ic_launcher"
- android:label="@string/app_name"
- <spanstyle="color:#ff0000;">android:name=".CrashApplication"></span>
- <activity
- android:label="@string/app_name"
- android:name=".CatchExceptionLogActivity">
- <intent-filter>
- <actionandroid:name="android.intent.action.MAIN"/>
- <categoryandroid:name="android.intent.category.LAUNCHER"/>
- </intent-filter>
- </activity>
- </application>
- </manifest>