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() {@Overridepublic 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！

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