我正在尝试使用sharedPreferences保存输入editText的内容，并显示该人在TextView中写入的数字越大，其他TextView中的数字越小，最后显示该人所提供的所有数字的数字将结果除以他们写的数字（我不是英文，我认为这个名字是平均的？，但你明白了......）。按钮代码有问题，我找不到什么，我问我的教授，他说我放错了提交，我想我已经修好了，但仍然没有用。到目前为止，这是我的代码：
public class MainActivity extends AppCompatActivity {
SharedPreferences sh;
float niligo,xukitana,garbodoro,guzzlorodo;
TextView pesbig;
TextView pessmall;
TextView pesmedio;
EditText peso;
int xa,xu,xo;
int maior,menor,media,total,quantidade;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
peso = (EditText)findViewById(R.id.editText);
pesbig = (TextView)findViewById(R.id.View1);
pessmall = (TextView)findViewById(R.id.View2);
pesmedio = (TextView)findViewById(R.id.View3);
Calendar calendar = Calendar.getInstance();
final int day = calendar.get(Calendar.DAY_OF_YEAR); //this is me trying to lock the edit text so the person can't give more than one number a day.
Button save = (Button) findViewById(R.id.button);
save.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int i = 0;
i++;
SharedPreferences prefs = getSharedPreferences("prefs",Context.MODE_PRIVATE);
SharedPreferences.Editor ed = prefs.edit();
xa = Integer.parseInt(peso.getText().toString());
ed.putInt("pes", xa);
xu = prefs.getInt("pes",xa);
quantidade = i;
total = xa+xu;
media = total/quantidade;
if (xu > xa){
ed.putInt("pesmai", xa);
niligo = prefs.getFloat("pesmai",xa);
pesbig.setText(prefs.getString("pesmai", null));
}
else if (xu < xa){
ed.putInt("pesmen", xa);
xukitana = prefs.getFloat("pesmen",xa);
pessmall.setText(prefs.getString("pesmen", null));
}
pesmedio.setText(String.valueOf(media));
ed.commit();
错误日志
当EditText为空时：
10-17 20:09:22.816 10133-10133/com.omfgdogs.omfgpeso E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.omfgdogs.omfgpeso, PID: 10133
java.lang.NumberFormatException: Invalid int: ""
at java.lang.Integer.invalidInt(Integer.java:137)
at java.lang.Integer.parseInt(Integer.java:358)
at java.lang.Integer.parseInt(Integer.java:331)
at com.omfgdogs.omfgpeso.MainActivity$1.onClick(MainActivity.java:47)
at android.view.View.performClick(View.java:4496)
at android.view.View$PerformClick.run(View.java:18603)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5426)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
at dalvik.system.NativeStart.main(Native Method)
当EditText有一个数字时：
10-17 20:12:15.056 12673-12673/com.omfgdogs.omfgpeso E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.omfgdogs.omfgpeso, PID: 12673
java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Float
at android.app.SharedPreferencesImpl.getFloat(SharedPreferencesImpl.java:254)
at com.omfgdogs.omfgpeso.MainActivity$1.onClick(MainActivity.java:63)
at android.view.View.performClick(View.java:4496)
at android.view.View$PerformClick.run(View.java:18603)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5426)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
at dalvik.system.NativeStart.main(Native Method)
〜这些线是我在这里引用的〜