SharedUtil

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SharedUtil工具类

布局：

<TextView    android:id="@+id/tv"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="Hello World!" />

SharedUtil工具类：

public class SharedUtil {    public static SharedPreferences sp;    public static String name = "shared_demo";    // 存放布尔类型；    public static void putData(Context context, String key, boolean value) {        // 获取SharedPreferences 的实例；需要用到context ；        sp = context.getSharedPreferences(name, Context.MODE_PRIVATE);        SharedPreferences.Editor editor = sp.edit();        editor.putBoolean(key, value);        editor.commit();    }    // 存放object类型；    public static void putData(Context context, String key, Object value) {        // 获取SharedPreferences 的实例；需要用到context ；        sp = context.getSharedPreferences(name, Context.MODE_PRIVATE);        SharedPreferences.Editor editor = sp.edit();        if (value instanceof Boolean) {            editor.putBoolean(key, (Boolean) value);        } else if (value instanceof String) {            editor.putString(key, (String) value);        } else if (value instanceof Float) {            editor.putFloat(key, (Float) value);        } else if (value instanceof Integer) {            editor.putInt(key, (Integer) value);        } else if (value instanceof Long) {            editor.putLong(key, (Long) value);        }        editor.commit();    }    // 根据key获取SharedPreferences里的value；通过判断defaultValue的类型，来选择不同的get方法；    public static Object getData(Context context, String key, Object defValue) {        sp = context.getSharedPreferences(name, Context.MODE_PRIVATE);        if (defValue instanceof String) {            return sp.getString(key, (String) defValue);        } else if (defValue instanceof Boolean) {            return sp.getBoolean(key, (Boolean) defValue);        } else if (defValue instanceof Integer) {            return sp.getInt(key, (Integer) defValue);        } else if (defValue instanceof Float) {            return sp.getFloat(key, (Float) defValue);        } else if (defValue instanceof Long) {            return sp.getLong(key, (Long) defValue);        }        return null;    }    // 根据key来移除数据    public static void removeData(Context context, String key) {        sp = context.getSharedPreferences(name, Context.MODE_PRIVATE);        SharedPreferences.Editor editor = sp.edit();        editor.remove(key);        editor.commit();    }    // 清除所有数据    public static void clearData(Context context) {        sp = context.getSharedPreferences(name, Context.MODE_PRIVATE);        SharedPreferences.Editor editor = sp.edit();        editor.clear();        editor.commit();    }    // 根据key判断这个value是否存在；    public static boolean isExist(Context context, String key) {        sp = context.getSharedPreferences(name, Context.MODE_PRIVATE);        return sp.contains(key);    }}Activity主类：public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        SharedUtil.putData(MainActivity.this, "one", true);        SharedUtil.putData(MainActivity.this, "two", "xiaoming");        SharedUtil.putData(MainActivity.this, "three", 123);        findViewById(R.id.tv).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                String value = (String) SharedUtil.getData(MainActivity.this,                        "two", "two");                Toast.makeText(MainActivity.this, value, Toast.LENGTH_SHORT)                        .show();                SharedUtil.removeData(MainActivity.this, "two");            }        });    }}

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