保存按钮停止应用程序

Question

public void save(View v) {
    switch(v.getId()) {
        case R.id.bSave:
            filename = "data/monday.txt";
            vsName.showPrevious();
            vsTime.showPrevious();
            vsQuantity.showPrevious();
            vsImage.showPrevious();
            save.setVisibility(View.GONE);

            try{
                monday = new File(filename);
                if (!monday.exists()) {
                    if (!monday.createNewFile()) {
                        throw new IOException("Unable to create file");
                    }
                }

                fos = new FileOutputStream(monday);
                oos = new ObjectOutputStream(fos);
                oos.writeObject(etName.getText().toString());
                oos.writeObject(etQuantity.getText().toString());
                oos.writeObject(etTime.getText().toString());
            }
            catch (Exception ex)
            {
                ex.printStackTrace();
            }
            finally{
                try {
                    fos.close();
                    oos.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }

            break;
    }
}

这是我保存方法的代码。我希望它保存编辑文本，这样即使在我关闭程序后我的文本视图也会保留。这是我第一次使用文件输出流，所以我不知道如何解决这个问题。当我点击保存按钮时，它说不幸的是它已经停止了。

05-22 15:32:40.095: E/AndroidRuntime(6984): FATAL EXCEPTION: main
05-22 15:32:40.095: E/AndroidRuntime(6984): java.lang.IllegalStateException: Could not     execute method of the activity
05-22 15:32:40.095: E/AndroidRuntime(6984):     at  android.view.View$1.onClick(View.java:3599)
05-22 15:32:40.095: E/AndroidRuntime(6984):     at android.view.View.performClick(View.java:4204)
05-22 15:32:40.095: E/AndroidRuntime(6984):     at android.view.View$PerformClick.run(View.java:17355)
05-22 15:32:40.095: E/AndroidRuntime(6984):     at android.os.Handler.handleCallback(Handler.java:725)
05-22 15:32:40.095: E/AndroidRuntime(6984):     at android.os.Handler.dispatchMessage(Handler.java:92)
05-22 15:32:40.095: E/AndroidRuntime(6984):     at  android.os.Looper.loop(Looper.java:137)
05-22 15:32:40.095: E/AndroidRuntime(6984):     at android.app.ActivityThread.main(ActivityThread.java:5041)
05-22 15:32:40.095: E/AndroidRuntime(6984):     at java.lang.reflect.Method.invokeNative(Native Method)
05-22 15:32:40.095: E/AndroidRuntime(6984):     at java.lang.reflect.Method.invoke(Method.java:511)
05-22 15:32:40.095: E/AndroidRuntime(6984):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
05-22 15:32:40.095: E/AndroidRuntime(6984):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
05-22 15:32:40.095: E/AndroidRuntime(6984):     at dalvik.system.NativeStart.main(Native Method)
05-22 15:32:40.095: E/AndroidRuntime(6984): Caused by: java.lang.reflect.InvocationTargetException
05-22 15:32:40.095: E/AndroidRuntime(6984):     at java.lang.reflect.Method.invokeNative(Native Method)
05-22 15:32:40.095: E/AndroidRuntime(6984):     at java.lang.reflect.Method.invoke(Method.java:511)
05-22 15:32:40.095: E/AndroidRuntime(6984):     at android.view.View$1.onClick(View.java:3594)
05-22 15:32:40.095: E/AndroidRuntime(6984):     ... 11 more
05-22 15:32:40.095: E/AndroidRuntime(6984): Caused by: java.lang.NullPointerException
05-22 15:32:40.095: E/AndroidRuntime(6984):     at tbjsoft.medicationreminder.Monday.save(Monday.java:170)
05-22 15:32:40.095: E/AndroidRuntime(6984):     ... 14 more

Answer 1

您最好使用共享首选项将文本保存在 edittext 中。

How to use SharedPreferences in Android to store, fetch and edit values

您在此处显示的方法无助于解决问题，除非您将使用此方法的代码放入其中。