Android的SharedPreferences（用于保存系统设置）

 

package com.xiva.shared;

import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class SharedActivity extends Activity {
    /** Called when the activity is first created. */
	private EditText format;
	private EditText size;
	private static final String TAG = "SharedActivity";
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button button  = (Button) this.findViewById(R.id.saveButton);
        Button showBtn = (Button) this.findViewById(R.id.showButton);
        format = (EditText) this.findViewById(R.id.format);
        size   = (EditText) this.findViewById(R.id.size);
        
        button.setOnClickListener(listener);
        showBtn.setOnClickListener(listener);
    }
    
    private View.OnClickListener listener = new View.OnClickListener() {
		@Override
		public void onClick(View paramView) {
			Button button = (Button)paramView;
			SharedPreferences prefere = SharedActivity.this.getSharedPreferences("xiva", Context.MODE_PRIVATE);
			switch (button.getId()) {
				case R.id.saveButton :
					String formatStr = format.getText().toString();
					String sizeStr   = size.getText().toString();
					//根据SharedPreferences得到编辑内容
					Editor editor = prefere.edit();
					editor.putString("format", formatStr);
					try{
						editor.putInt("size",Integer.parseInt(sizeStr));
					}
					catch(Exception e)
					{
						Toast.makeText(SharedActivity.this, "参数设置失败，文件大小只能输入数字！", Toast.LENGTH_LONG).show();
					}
					boolean result = editor.commit();//将editor提交
					if(result){
						Toast.makeText(SharedActivity.this, "参数设置成功！", Toast.LENGTH_LONG).show();					
					}
					else
					{
						Toast.makeText(SharedActivity.this, "参数设置失败,", Toast.LENGTH_LONG).show();
					}
					break;
				case R.id.showButton :
					Log.i(TAG,"show");
					Toast.makeText(SharedActivity.this, "显示", Toast.LENGTH_LONG).show();
					String _str01 = prefere.getString("format", "");
					format.setText(_str01);
					break;
			}			
		}
    };
}

 SharedPreferences prefere = SharedActivity.this.getSharedPreferences("xiva", Context.MODE_PRIVATE);

Editor editor = prefere.edit();

editor.commit();

程序运行后，将数据保存在本程序目录下的shared_prefs文件夹下。

SharedPreferences prefere = SharedActivity.this.getPreferences(MODE_PRIVATE);

getPreferences这个方法创建的是shared_prefs已SharedActivity（即程序名）为名称的xml配置文件。

 

this.createPackageContext(packageName, flags)

这个方法可以创建其他应用的上下文(context),因此这个配置也适合其他应用调用该配置文件！

完整代码见附件！