android学习笔记(21)用户配置信息的保存

╰半夏微凉° 2022-08-05 08:23 161阅读 0赞

保存用户的配置信息用SharedPreferences,一般是保存成XML格式。

这里的layout文件沿用上一课的布局

**源码:**

**MainActivity.java**

package com.exampl1e.sharepreferences;
    
    
    import java.io.FileNotFoundException;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.util.jar.Attributes.Name;
    
    import android.net.sip.SipAudioCall.Listener;
    import android.os.Bundle;
    import android.R.integer;
    import android.app.Activity;
    import android.content.Context;
    import android.content.SharedPreferences;
    import android.content.SharedPreferences.Editor;
    import android.util.Log;
    import android.view.Menu;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.TextView;
    import android.widget.Toast;
    
    public class MainActivity extends Activity {
    
    	private Button btnsave;
    	private Button btnlook;
    	private EditText edtname;
    	private EditText edtconText;
    	private TextView txt;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            btnsave = (Button)findViewById(R.id.btnsave);
            btnlook = (Button)findViewById(R.id.btnlook);
            edtconText = (EditText)findViewById(R.id.edtcontent);
            edtname = (EditText)findViewById(R.id.edtname);
            txt = (TextView)findViewById(R.id.txt);
            btnsave.setOnClickListener(listener);
            btnlook.setOnClickListener(listener);
    
        }
    
        private OnClickListener listener = new OnClickListener() {
    		
    		@Override
    		public void onClick(View v) {
    			SharedPreferences pres = MainActivity.this.getSharedPreferences("cofig", Context.MODE_PRIVATE);
    			//这里不同的是不用写后缀。
    			switch (v.getId()) {
    			case R.id.btnsave:
    				Editor editor = pres.edit();
    				editor.clear();
    				editor.putString("name", edtname.getText().toString());
    				editor.putInt("age", Integer.valueOf(edtconText.getText().toString()));
    				editor.commit();//只有当上面的信息都正确之后才会执行保存
    				Toast.makeText(MainActivity.this, "保存成功!", Toast.LENGTH_SHORT).show();
    				break;
    			case R.id.btnlook:
    				//pres.getString(key, defValue)第二个参数是在没有这个值时设定为no
    				String name = pres.getString("name","no");
    				int age = pres.getInt("age", 0);
    				String bir = pres.getString("bir", "no");
    				txt.setText("用户的信息为:\n 名字:"+name+"\n年龄:"+age+"\n生日"+bir);
    				break;
    			}
    			
    		}
    	};
        
    }

![20150909223251419][]

[20150909223251419]: /images/20220731/76abd7c173114b989a001005c9f05402.png