Android程序自动退但是没有提示任何错误

不知大伙有没有遇到这样的问题 ,  使用android应用程序过程中, 一般是在listview或textview加载数据的时候程序突然退出, 并且没有提示任何错误.   到网上搜索, 没有找到任何有效的信息. 没办吧 , 只得自己打印日志一步一步调试程序 . 最后终于发现了一点眉目.  

06-05 08:51:00.691: DEBUG/InputReader(202): AP_PROF:AppLaunch_dispatchPtr:Up:357013
06-05 08:51:00.692: DEBUG/InputDispatcher(202): Waiting because touched window Window{407b4788 com.tencent.mm/com.tencent.mm.ui.MainTabUI paused=false} still processing previous input.
06-05 08:51:00.692: DEBUG/PowerManagerService(202): userActivity mLastEventTime=356787 time=357013 mUserActivityAllowed=true mUserState=0x7 mWakeLockState=0x0 mProximitySensorActive=false mProximitySensorEnabed=false timeoutOverride=-1 force=false
06-05 08:51:00.692: DEBUG/PowerManagerService(202): reactivateScreenLocksLocked mProxIgnoredBecauseScreenTurnedOff=false
06-05 08:51:00.692: DEBUG/PowerManagerService(202): setPowerState: mPowerState=0x7 newState=0x7 noChangeLights=false reason=2
06-05 08:51:00.692: DEBUG/PowerManagerService(202): setTimeoutLocked now=357013 timeoutOverride=-1 nextState=7 when=363013
06-05 08:51:00.693: DEBUG/InputDispatcher(202): Waiting because touched window Window{407b4788 com.tencent.mm/com.tencent.mm.ui.MainTabUI paused=false} still processing previous input.
06-05 08:51:00.695: DEBUG/InputDispatcher(202): Waiting because touched window Window{407b4788 com.tencent.mm/com.tencent.mm.ui.MainTabUI paused=false} still processing previous input.
06-05 08:51:00.697: VERBOSE/MicroMsg.NetSceneBatchGetHeadImg(900): set writting pause: true, handlerunning: false
06-05 08:51:00.739: ERROR/MicroMsg.AvatarStorage(900): small bm not exsit
06-05 08:51:00.739: DEBUG/MicroMsg.AvatarStorage(900): read from png :false
06-05 08:51:00.740: DEBUG/MicroMsg.AvatarLogic(900): getting head image: www521wy
06-05 08:51:00.740: DEBUG/MicroMsg.AvatarLogic(900): avatar service push :www521wy
06-05 08:51:00.779: ERROR/MicroMsg.AvatarStorage(900): small bm not exsit
06-05 08:51:00.780: DEBUG/MicroMsg.AvatarStorage(900): read from png :false
06-05 08:51:00.780: DEBUG/MicroMsg.AvatarLogic(900): getting head image: huzhenwei2011
06-05 08:51:00.781: DEBUG/MicroMsg.AvatarLogic(900): avatar service push :huzhenwei2011
06-05 08:51:00.807: WARN/System.err(900): java.lang.StringIndexOutOfBoundsException
06-05 08:51:00.811: WARN/System.err(900): at java.lang.String.getChars(String.java:1059)
06-05 08:51:00.813: DEBUG/MicroMsg.HttpMgr(908): onStatusCallback=4
06-05 08:51:00.815: DEBUG/MicroMsg.HttpMgr(908): onStatusCallback=4
06-05 08:51:00.817: WARN/System.err(900): at android.text.SpannableStringInternal.getChars(SpannableStringInternal.java:102)
06-05 08:51:00.819: WARN/System.err(900): at android.text.TextUtils.getChars(TextUtils.java:105)
06-05 08:51:00.819: WARN/System.err(900): at android.text.Layout.processToSupportEmoji(Layout.java:3747)
06-05 08:51:00.822: WARN/System.err(900): at android.text.Layout.supportTabandEmoji(Layout.java:3783)
06-05 08:51:00.824: WARN/System.err(900): at android.text.Layout.measureText2(Layout.java:3141)
06-05 08:51:00.826: WARN/System.err(900): at android.text.Layout.getDesiredWidth2(Layout.java:183)
06-05 08:51:00.828: WARN/System.err(900): at android.text.Layout.getDesiredWidth2(Layout.java:161)
06-05 08:51:00.830: WARN/System.err(900): at android.widget.TextView.onMeasure2(TextView.java:5925)
06-05 08:51:00.830: WARN/System.err(900): at android.widget.TextView.onMeasure(TextView.java:6138)
06-05 08:51:00.831: WARN/System.err(900): at android.view.View.measure(View.java:8363)
06-05 08:51:00.831: WARN/System.err(900): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3169)
06-05 08:51:00.832: WARN/System.err(900): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1048)
06-05 08:51:00.833: WARN/System.err(900): at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:732)
06-05 08:51:00.833: WARN/System.err(900): at android.widget.LinearLayout.onMeasure(LinearLayout.java:342)
06-05 08:51:00.833: WARN/System.err(900): at android.view.View.measure(View.java:8363)
06-05 08:51:00.834: WARN/System.err(900): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3169)
06-05 08:51:00.834: WARN/System.err(900): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1048)
06-05 08:51:00.835: WARN/System.err(900): at android.widget.LinearLayout.measureVertical(LinearLayout.java:417)
06-05 08:51:00.835: WARN/System.err(900): at android.widget.LinearLayout.onMeasure(LinearLayout.java:340)
06-05 08:51:00.835: WARN/System.err(900): at android.view.View.measure(View.java:8363)
06-05 08:51:00.836: WARN/System.err(900): at android.widget.ListView.setupChild(ListView.java:1862)
06-05 08:51:00.836: WARN/System.err(900): at android.widget.ListView.makeAndAddView(ListView.java:1789)
06-05 08:51:00.836: WARN/System.err(900): at android.widget.ListView.fillUp(ListView.java:735)
06-05 08:51:00.838: WARN/System.err(900): at android.widget.ListView.fillGap(ListView.java:681)
06-05 08:51:00.840: WARN/System.err(900): at android.widget.AbsListView.trackMotionScroll(AbsListView.java:3508)
06-05 08:51:00.842: WARN/System.err(900): at android.widget.AbsListView$FlingRunnable.run(AbsListView.java:3002)
06-05 08:51:00.843: WARN/System.err(900): at android.os.Handler.handleCallback(Handler.java:618)
06-05 08:51:00.845: WARN/System.err(900): at android.os.Handler.dispatchMessage(Handler.java:123)
06-05 08:51:00.845: WARN/System.err(900): at android.os.Looper.loop(SourceFile:351)
06-05 08:51:00.846: WARN/System.err(900): at android.app.ActivityThread.main(ActivityThread.java:3814)
06-05 08:51:00.847: WARN/System.err(900): at java.lang.reflect.Method.invokeNative(Native Method)
06-05 08:51:00.847: WARN/System.err(900): at java.lang.reflect.Method.invoke(Method.java:538)
06-05 08:51:00.848: WARN/System.err(900): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
06-05 08:51:00.849: WARN/System.err(900): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:659)

他大爷的 ,  终于到到了一些错误提示信息了.  但是仔细一看错误提示信息 , 又开始蛋疼了, 只不是TM的android系统framework里面的类报的错吗. 

06-05 08:51:00.817: WARN/System.err(900): at android.text.SpannableStringInternal.getChars(SpannableStringInternal.java:102)
06-05 08:51:00.819: WARN/System.err(900): at android.text.TextUtils.getChars(TextUtils.java:105)
06-05 08:51:00.819: WARN/System.err(900): at android.text.Layout.processToSupportEmoji(Layout.java:3747)
06-05 08:51:00.822: WARN/System.err(900): at android.text.Layout.supportTabandEmoji(Layout.java:3783)
06-05 08:51:00.824: WARN/System.err(900): at android.text.Layout.measureText2(Layout.java:3141)

然道, android系统的famework里面的类有问题.  事出有因, 既然这么提示, 那么得好好看看具体如何实现. 
打开源码, 进入 : frameworks\base\core\java\android\text\TextUtils.java 
getChars函数:

public static void getChars(CharSequence s, int start, int end,
char[] dest, int destoff) {
Class c = s.getClass();
if (c == String.class){	
((String) s).getChars(start, end, dest, destoff);
}else if (c == StringBuffer.class){	
((StringBuffer) s).getChars(start, end, dest, destoff);
}else if (c == StringBuilder.class){
System.out.println("class type: StringBuilder.class");
((StringBuilder) s).getChars(start, end, dest, destoff);
}else if (s instanceof GetChars){	
((GetChars) s).getChars(start, end, dest, destoff);//此处为105行, 而此处时间调用的是SpannableStringInternal.java的getChars函数.
}else {	
for (int i = start; i < end; i++){
dest[destoff++] = s.charAt(i); 
} 
}
}

 frameworks\base\core\java\android\text\ SpannableStringInternal .java  的getChars函数代码如下:

public final void getChars(int start, int end, char[] dest, int off) { 
mText.getChars(start, end, dest, off);	
}

 

此处的 mText 是一个String对象. 根据异常提示信息, 可以肯定的是 dest 的值过大了. 但是dest是由android系统提供的 , 我们无法控制的呀.  然后返回, 查找dest值的出处. 最后终于在Layout.java的processToSupportEmoji函数处找到:
frameworks\base\core\java\android\text\  Layout.java的processToSupportEmoj 如下:

static CharSequence processToSupportEmoji(CharSequence text,int start, int end) {
Spannable spannable = null;
boolean containEmoji = false; 
int length = end - start +1;
char[] chs = TextUtils.obtain(length);
TextUtils.getChars(text, start, end, chs, 0);


for (int i = start ; i < end; i++) {
char c = chs[end-start];
if (c >= 0xD800 && c <= 0xDFFF && i + 1 < length) {	
char[] tmp = TextUtils.obtain(2);
TextUtils.getChars(text, i, i+2, tmp, 0);


int emoji = Character.codePointAt(tmp, 0);


if (emoji >= MIN_EMOJI && emoji <= MAX_EMOJI) {
Bitmap bm = EMOJI_FACTORY.getBitmapFromAndroidPua(emoji);
if (bm != null) {
containEmoji = true;
if (spannable == null) {
if (!(text instanceof Spannable)) {
spannable = new SpannableString(text);
} else {
spannable = (Spannable)text;
}
}


EmojiReplacementSpan emojiReplaceSpan = new EmojiReplacementSpan(bm);
spannable.setSpan(emojiReplaceSpan, i, i+1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}


TextUtils.recycle(tmp);
i++;
}
}

这个函数, 具体要做什么事情我看不太明白 , 但是看到for循环里面的 if (c >= 0xD800 && c <= 0xDFFF && i + 1 < length) { 以及后面的 TextUtils.getChars(text, i, i+2, tmp, 0); , if里是i+i , 而此次却传递i+2. 会不会这里的值传递有问题呢. 抱着试一试的心态把1改成2. 重新编译源码, 奇迹居然出现了.  所有, 有时候啊, 权威并不一定是正确的.