存取用户名实例

淡淡的烟草味﹌ 2022-07-18 01:30 176阅读 0赞

xml文件：

java文件：

package com.example.demo1;
    
    import android.app.Activity;
    import android.content.SharedPreferences;
    import android.content.SharedPreferences.Editor;
    import android.os.Bundle;
    import android.preference.Preference;
    import android.preference.PreferenceManager;
    import android.view.Menu;
    import android.view.MenuItem;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.CheckBox;
    import android.widget.EditText;
    import android.widget.Toast;
    
    
    public class MainActivity extends Activity {
    	EditText edusernam;
    	EditText password;
    	CheckBox checkBox;
    	Button Login;
    	Button Cancel;
    	SharedPreferences pref;
    	Editor editor;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            //SharedPreferences preferences=PreferenceManager.getDefaultSharedPreferences(MainActivity.this);
    //        SharedPreferences preferences=getSharedPreferences("mypref", MODE_PRIVATE);
    //        Editor editor=preferences.edit();
    //        editor.putString("name","张三");
    //        editor.putInt("age",30);
    //        editor.putLong("time",System.currentTimeMillis());
    //        editor.putBoolean("default",true);
    //        editor.commit();
    //        editor.remove("default");
    //        editor.commit();
    //        System.out.println(preferences.getString("name",""));
    //        System.out.println(preferences.getInt("age",0));
            edusernam=(EditText) findViewById(R.id.editusername);
            password=(EditText) findViewById(R.id.editpassword);
            Login=(Button) findViewById(R.id.btnlogin);
            Cancel=(Button) findViewById(R.id.btncancel);
            checkBox=(CheckBox) findViewById(R.id.savename);
            pref=getSharedPreferences("User",MODE_PRIVATE);
            editor=pref.edit();
            String name=pref.getString("username","");
            if(name.equals("")){
            	checkBox.setChecked(false);
            }
            else {
    			checkBox.setChecked(true);
    			edusernam.setText(name);
    		}
            Login.setOnClickListener(new OnClickListener() {
    			
    			@Override
    			public void onClick(View v) {
    				// TODO Auto-generated method stub
    				String name=edusernam.getText().toString().trim();
    				String password1=password.getText().toString();
    				if("admin".equals(name)&&"123".equals(password1)){
    					if(checkBox.isChecked()){
    						editor.putString("username",name);
    						editor.commit();
    					}
    					else {
    						editor.remove("username");
    						editor.commit();
    					}
    					Toast.makeText(MainActivity.this,"登陆成功",Toast.LENGTH_LONG).show();
    				}
    				else {
    					Toast.makeText(MainActivity.this,"登陆失败",Toast.LENGTH_LONG).show();
    				}
    			}
    		});
            
        }
    }