Activity重新创建之recreate

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Android在3.0之后，Activity引入了新的一个方法：recreate()，从字面意思就知道是重新创建Activity的，3.0+版本才可以使用。

/** * 调用recreate方法重新创建Activity会比正常启动Activity多调用了onSaveInstanceState * ()和onRestoreInstanceState()两个方法，onSaveInstanceState()会在onCreate方法之前调用。 * 所以可以在onCreate()方法中获取onSaveInstanceState()保存的Theme数据 *  * @description： * @author ldm * @date 2016-4-19 上午9:34:49 */public class MainActivity extends Activity implements OnClickListener {    private Button recreate;    private int mCurrentTheme;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        // 从onSaveInstanceState(Bundle outState)方法中保存的数据取出Theme        if (savedInstanceState != null) {            mCurrentTheme = savedInstanceState.getInt("mCurrentTheme");            // 切换Activity的Theme            switch (mCurrentTheme) {            case android.R.style.Theme_Holo_Light:                mCurrentTheme = android.R.style.Theme_Holo_Dialog;                break;            case android.R.style.Theme_Holo_Dialog:                mCurrentTheme = android.R.style.Theme_Holo;                break;            default:                mCurrentTheme = android.R.style.Theme_Holo_Light;                break;            }            setTheme(mCurrentTheme);        }        setContentView(R.layout.activity_main);        this.recreate = (Button) findViewById(R.id.recreate);        this.recreate.setOnClickListener(this);    }    @Override    protected void onSaveInstanceState(Bundle outState) {        super.onSaveInstanceState(outState);        outState.putInt("mCurrentTheme", mCurrentTheme);// 把当前Theme保存    }    @Override    public void onClick(View v) {        recreate();// 直接调用Activity的recreate()方法重启Activity    }}

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