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   源码介绍

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public class MainActivity extends Activity {
	private EditText keyET;
	private EditText valueET;
	private Button insertBtn;
	private Button deleteBtn;
	private Button modifyBtn;
	private Button queryBtn;
	private Button clearBtn;
	private TextView textView;
	/** 存储的文件名 */
	public static final String DATABASE = "Database";
	/** 存储后的文件路径：/data/data/<package name>/shares_prefs   文件名.xml */
	public static final String PATH = "/data/data/code.sharedpreferences/shared_prefs/Database.xml";

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		keyET = (EditText) findViewById(R.id.key);
		valueET = (EditText) findViewById(R.id.value);
		insertBtn = (Button) findViewById(R.id.insert);
		deleteBtn = (Button) findViewById(R.id.delete);
		modifyBtn = (Button) findViewById(R.id.modify);
		queryBtn = (Button) findViewById(R.id.query);
		clearBtn = (Button) findViewById(R.id.clear);
		// 用于显示存储文件中数据
		textView = (TextView) findViewById(R.id.content);
		insertBtn.setOnClickListener(new OperateOnClickListener());
		deleteBtn.setOnClickListener(new OperateOnClickListener());
		modifyBtn.setOnClickListener(new OperateOnClickListener());
		queryBtn.setOnClickListener(new OperateOnClickListener());
		clearBtn.setOnClickListener(new OperateOnClickListener());
	}

	class OperateOnClickListener implements OnClickListener {
		@Override
		public void onClick(View v) {
			// 获取SharedPreferences对象
			SharedPreferences sp = getSharedPreferences(DATABASE,
					Activity.MODE_PRIVATE);
			// 获取Editor对象
			Editor editor = sp.edit();
			// 　获取界面中的信息
			String key = keyET.getText().toString();
			String value = valueET.getText().toString();
			switch (v.getId()) {
			// 插入数据
			case R.id.insert:
				editor.putString(key, value);
				editor.commit();
				textView.setText(MainActivity.this.print());
				break;
			// 删除数据
			case R.id.delete:
				editor.remove(key);
				editor.commit();
				textView.setText(MainActivity.this.print());
				break;
			// 修改数据
			case R.id.modify:
				editor.putString(key, value);
				editor.commit();
				textView.setText(MainActivity.this.print());
				break;
			// 查询数据
			case R.id.query:
				String result = sp.getString(key, "");
				textView.setText("key="   key   ",value="   result);
				break;
			// 清空所有数据
			case R.id.clear:
				editor.clear();
				editor.commit();
				textView.setText(MainActivity.this.print());
				break;
			}

		}
	}

	/** 获取存储文件的数据 */
	private String print() {
		StringBuffer buff = new StringBuffer();
		try {
			BufferedReader reader = new BufferedReader(new InputStreamReader(
					new FileInputStream(PATH)));
			String str;
			while ((str = reader.readLine()) != null) {
				buff.append(str   "\n");
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return buff.toString();
	}
}