android 夜间模式

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SharedPreferrenceHelper

public class SharedPreferrenceHelper {    private static final String THEME = "theme";    public static void settheme(Context context, String theme){        SharedPreferences sp = context.getSharedPreferences("demo",Context.MODE_PRIVATE);        SharedPreferences.Editor editor = sp.edit();        editor.putString(THEME,theme);        editor.apply();    }    public static String gettheme(Context context){        SharedPreferences sp = context.getSharedPreferences("demo",Context.MODE_PRIVATE);        return sp.getString(THEME,"1");    }}

utils

public class utils {    public static int getAppTheme(Context context){        String value = SharedPreferrenceHelper.gettheme(context);        switch (Integer.valueOf(value)){            case 1:                return R.style.AppTheme;            case 2:                return R.style.AppThemeDark;            default:                return R.style.AppTheme;        }    }    public static void switchAppTheme(Context context){        String value = SharedPreferrenceHelper.gettheme(context);        switch (Integer.valueOf(value)){            case 1:                SharedPreferrenceHelper.settheme(context,"2");                break;            case 2:                SharedPreferrenceHelper.settheme(context,"1");                break;            default:                SharedPreferrenceHelper.settheme(context,"1");                break;        }    }}

BaseActivity

public abstract class BaseActivity extends FragmentActivity {    TextView mTextView;    private int theme = 0;    private static final String TAG = "MainActivity";    @Override    protected void onResume() {        Log.d(TAG,"onResume");        super.onResume();        if(theme==utils.getAppTheme(this)){        }else{            reload();        }    }    @Override    protected void onDestroy() {        super.onDestroy();        Log.d(TAG,"onDestroy");    }    @Override    protected void onSaveInstanceState(Bundle outState) {        super.onSaveInstanceState(outState);        outState.putInt("theme",theme);    }    @Override    protected void onCreate(Bundle savedInstanceState) {        if(savedInstanceState==null){            theme=utils.getAppTheme(this);        }else{            theme=savedInstanceState.getInt("theme");        }        setTheme(theme);        super.onCreate(savedInstanceState);        Log.d(TAG,"onCreate");        //setContentView(R.layout.activity_main);        setView();    }    abstract void setView();    public void reload() {        Intent intent = getIntent();        overridePendingTransition(0, 0);//不设置进入退出动画        intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);        finish();        overridePendingTransition(0, 0);        startActivity(intent);    }    @Override    protected void onRestart() {        super.onRestart();        Log.d(TAG, "onRestart");    }    @Override    protected void onPause() {        super.onPause();        Log.d(TAG,"onPause");    }}

style

<resources>    <!-- Base application theme. -->    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">        <!-- Customize your theme here. -->        <item name="colorPrimary">@color/colorPrimary</item>        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>        <item name="colorAccent">@color/colorAccent</item>    </style>    <style name="AppThemeDark" parent="Theme.AppCompat"></style></resources>

MainActivity

public class MainActivity extends BaseActivity {    private Button btn1;    @Override    void setView() {        setContentView(R.layout.activity_main);        btn1= (Button) findViewById(R.id.btn);        btn1.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                utils.switchAppTheme(MainActivity.this);                reload();            }        });    }}

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