android 自定义处理全局异常

public class MainActivity extends AppCompatActivity {

String nullString;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

Log.i("mytool", nullString.equals("")+"");

}
}

/**
* Created by liyihang on 17-7-14.
* 用户为处理异常全局处理类
*/

public class CrashHandler implements Thread.UncaughtExceptionHandler {

private Thread.UncaughtExceptionHandler defaultUncaughtExceptionHandler;
private Context mContext;
private HashMap<String, String> infos=new HashMap<>();

private CrashHandler(){

}

public static CrashHandler instance=null;

public static CrashHandler getInstance(){
if (instance==null)
{
synchronized (CrashHandler.class)
{
if (instance==null)
{
instance=new CrashHandler();
}
}
}
return instance;
}

/**
*
* 初始化获取默认错误处理机制
* 使用自定义错误类替换错误处理
* @param context 上下文
*/
public void init(Context context){
mContext = context;
defaultUncaughtExceptionHandler = Thread.getDefaultUncaughtExceptionHandler();
Thread.setDefaultUncaughtExceptionHandler(this);
}

/**
*
* 系统异常处理回调
* @param thread
* @param throwable
*/
@Override
public void uncaughtException(Thread thread, Throwable throwable) {
if (! handlerException(throwable) && defaultUncaughtExceptionHandler!=null)
{
//使用系统默认错误处理机制
defaultUncaughtExceptionHandler.uncaughtException(thread, throwable);
}else {
//暂停用来程序处理
try {
Thread.sleep(2300);
} catch (InterruptedException e) {
e.printStackTrace();
}
android.os.Process.killProcess(Process.myPid());
System.exit(1);
}
}

private boolean handlerException(Throwable throwable) {
if (throwable==null)
{
return false;
}
new Thread(new Runnable() {
@Override
public void run() {
Looper.prepare();
Toast.makeText(mContext, "application error exit",Toast.LENGTH_LONG).show();
Looper.loop();
}
}).start();
getDevicesInfo();
saveCrashInfo(throwable);
return true;
}

/**
*
* 保存系统异常信息
* @param throwable
*/
private void saveCrashInfo(Throwable throwable) {
StringBuffer buffer=new StringBuffer();
Set<String> strings = infos.keySet();
for (String string : strings) {
buffer.append(string+"=="+infos.get(string)+"\n");
}

StringWriter stringWriter = new StringWriter();
PrintWriter printWriter = new PrintWriter(stringWriter);
throwable.printStackTrace(printWriter);
Throwable cause = throwable.getCause();
while (cause!=null)
{
cause.printStackTrace(printWriter);
cause = cause.getCause();
}
printWriter.close();

String s = stringWriter.toString();
Log.i("mytool", ""+s);
buffer.append(s);

try {
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
File file=new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/error.txt");
FileOutputStream fileOutputStream=new FileOutputStream(file);
fileOutputStream.write(buffer.toString().getBytes());
fileOutputStream.flush();
fileOutputStream.close();
}
}catch (Exception e){
Log.i("mytool", "error info=="+e.getMessage());
}

}

/**
*
* 获取设备异常信息
*/
private void getDevicesInfo() {

try {
PackageManager packageManager = mContext.getPackageManager();
PackageInfo packageInfo = packageManager.getPackageInfo(mContext.getPackageName(), PackageManager.GET_ACTIVITIES);
if (packageInfo!=null)
{
String versionName = packageInfo.versionName+"";
String versionCode = packageInfo.versionCode+"";
Log.i("mytool", "version name=="+versionName);
Log.i("mytool", "version code=="+versionCode);
}
}catch (Exception e){
Log.i("mytool", "error info=="+e.getMessage());
}
Field[] declaredFields = Build.class.getDeclaredFields();
for (Field declaredField : declaredFields) {
try {
declaredField.setAccessible(true);
infos.put(declaredField.getName(), declaredField.get(null).toString());
Log.i("mytool", declaredField.getName()+"=="+declaredField.get(null).toString());
}catch (Exception e){
Log.i("mytool", "error info=="+e.getMessage());
}
}

}
}

/**
* Created by liyihang on 17-7-14.
*/

public class MyAppliction extends Application {

@Override
public void onCreate() {
super.onCreate();
CrashHandler.getInstance().init(getApplicationContext());
}

@Override
public void onTerminate() {
super.onTerminate();

}
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.javadome.liyihang.javadome">

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

<application
android:name=".MyAppliction"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>