问题描述
package com.carterharrison.taptap;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.media.MediaPlayer;
import android.os.Vibrator;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity {
SharedPreferences SP;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SP = getSharedPreferences("points", Context.MODE_PRIVATE);
}
public int x = SP.getInt("points", -1);
public void val1(View v){
x = (x+1);
con();
}
public void val2(View v){
x = (x+2);
con();
}
public void val3(View v){
x = (x+5);
con();
}
public void val4(View v){
x = (x+10);
con();
}
public void val5(View v){
x = (x+25);
con();
}
public void val6(View v){
x = (x+50);
con();
}
public void con(){
SharedPreferences.Editor editor = SP.edit();
if (x > 1000) {
ImageView img5=(ImageView)findViewById(R.id.imageView5);
img5.setVisibility(View.VISIBLE);}
if (x > 625) {
ImageView img4=(ImageView)findViewById(R.id.imageView4);
img4.setVisibility(View.VISIBLE);}
if (x > 300) {
ImageView img3=(ImageView)findViewById(R.id.imageView3);
img3.setVisibility(View.VISIBLE);}
if (x > 100) {
ImageView img2=(ImageView)findViewById(R.id.imageView2);
img2.setVisibility(View.VISIBLE);}
if (x > 30) {
ImageView img=(ImageView)findViewById(R.id.ImageView);
img.setVisibility(View.VISIBLE);}
TextView tv = (TextView)findViewById(R.id.val);
tv.setText("" + x);
editor.putInt("score", x);
editor.apply();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
我试图保存int x的值。 我的应用程序在启动时崩溃，有人可以帮我吗，我是java和SharedPreferences的新手，谢谢。 我可能做错了一切，我需要帮助保存x的值。
1楼
在SharedPReference中设置int值。
public void SaveInt(String key, int value){
SharedPreferences sharedPreferences = getSharedPreferences("points", Activity.MODE_PRIVATE)
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putInt(key, value);
editor.commit();
}
从SharedPreference获取Int值
public void LoadInt(String key){
SharedPreferences sharedPreferences = getSharedPreferences("points", Activity.MODE_PRIVATE)
int savedValue = sharedPreferences.getInt(key, 0);
}
编辑：
每当您想将 int值保存在共享首选项中时，只需调用以下方法：
SaveInt（“ my_int”，5）;
每当您要检索相同int的值时：
int mScore = LoadInt（“ my_int”）;
希望对您有帮助。