Android使用Intent返回上一个Activity时StackOverflowError

来源：互联网发布：python 量化交易平台编辑：程序博客网时间：2024/04/29 08:30

问题是这样的，有AB两个Activity,A中用startActivityForResult启动Activity B,B中执行完毕之后用setResult(resultCode,intent)将结果返回给A,这样没有问题。但是运行时点击B的完成按钮就报错，log信息如下

<span style="font-size:18px;"><span style="color:#ff0000;">10-14 16:33:30.362: E/AndroidRuntime(18115): FATAL EXCEPTION: main10-14 16:33:30.362: E/AndroidRuntime(18115): java.lang.IllegalStateException: Could not execute method of the activity10-14 16:33:30.362: E/AndroidRuntime(18115): at android.view.View$1.onClick(View.java:3599)10-14 16:33:30.362: E/AndroidRuntime(18115): at android.view.View.performClick(View.java:4204)10-14 16:33:30.362: E/AndroidRuntime(18115): at android.view.View$PerformClick.run(View.java:17355)10-14 16:33:30.362: E/AndroidRuntime(18115): at android.os.Handler.handleCallback(Handler.java:725)10-14 16:33:30.362: E/AndroidRuntime(18115): at android.os.Handler.dispatchMessage(Handler.java:92)10-14 16:33:30.362: E/AndroidRuntime(18115): at android.os.Looper.loop(Looper.java:137)10-14 16:33:30.362: E/AndroidRuntime(18115): at android.app.ActivityThread.main(ActivityThread.java:5102)10-14 16:33:30.362: E/AndroidRuntime(18115): at java.lang.reflect.Method.invokeNative(Native Method)10-14 16:33:30.362: E/AndroidRuntime(18115): at java.lang.reflect.Method.invoke(Method.java:511)10-14 16:33:30.362: E/AndroidRuntime(18115): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:797)10-14 16:33:30.362: E/AndroidRuntime(18115): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:564)10-14 16:33:30.362: E/AndroidRuntime(18115): at dalvik.system.NativeStart.main(Native Method)10-14 16:33:30.362: E/AndroidRuntime(18115): Caused by: java.lang.reflect.InvocationTargetException10-14 16:33:30.362: E/AndroidRuntime(18115): at java.lang.reflect.Method.invokeNative(Native Method)10-14 16:33:30.362: E/AndroidRuntime(18115): at java.lang.reflect.Method.invoke(Method.java:511)10-14 16:33:30.362: E/AndroidRuntime(18115): at android.view.View$1.onClick(View.java:3594)10-14 16:33:30.362: E/AndroidRuntime(18115): ... 11 more10-14 16:33:30.362: E/AndroidRuntime(18115): Caused by: java.lang.StackOverflowError10-14 16:33:30.362: E/AndroidRuntime(18115): at java.util.HashMap.doubleCapacity(HashMap.java:575)10-14 16:33:30.362: E/AndroidRuntime(18115): at java.util.HashMap.put(HashMap.java:405)10-14 16:33:30.362: E/AndroidRuntime(18115): at android.os.Bundle.putString(Bundle.java:492)10-14 16:33:30.362: E/AndroidRuntime(18115): at android.content.Intent.putExtra(Intent.java:5340)10-14 16:33:30.362: E/AndroidRuntime(18115): at com.example.test.ActivityB.finish(ActivityB.java:45)10-14 16:33:30.362: E/AndroidRuntime(18115): at com.example.test.ActivityB.finish(ActivityB.java:47)10-14 16:33:30.362: E/AndroidRuntime(18115): at com.example.test.ActivityB.finish(ActivityB.java:47)10-14 16:33:30.362: E/AndroidRuntime(18115): at com.example.test.ActivityB.finish(ActivityB.java:47)10-14 16:33:30.362: E/AndroidRuntime(18115): at com.example.test.ActivityB.finish(ActivityB.java:47)</span></span>

错误指出caused by java.lang.StackOverflowError.使用单步调试的时候发现点击B的完成按钮时总是在调用的函数中循环，搜索StackOverflowError相关信息很多都是和布局嵌套层数太多造成的，但是这里并不存在这种情况。最后发现时函数名造成的，其中ActivityB完成按钮响应代码如下：

<span style="font-size:18px;">    public void onClick(View v){    switch(v.getId()){    case R.id.Start_C:    startC();    break;    case R.id.Back_A:    finish();    break;    }    }    public void startC(){Intent intent = new Intent(this,ActivityC.class);this.startActivityForResult(intent, requestCodeOfB);        }        public void finish(){Intent intent = new Intent(this,ActivityA.class);intent.putExtra("msgOfB", "msgOfB:"+et_info.getText().toString()+"\nmsgOfC:"+tv_info.getText().toString());this.setResult(resultCodeOfB, intent);this.finish();        }</span>

问题就出在这个响应函数的函数名finish()上，点击完成按钮后调用finish()函数，该函数中将ActivityB的处理结果返回给A,同时用this.finish()关掉ActivityB,这是我们常规的处理方法，但是按钮响应函数名写成finish()时和Activity的finish()函数是重名的，相当于重写了这个方法，所以调用这个方法的时候引起递归，单步的时候就会看见finish()这个函数循环执行，解决办法就是将按钮响应函数写成别的名字即可。

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