Android_SplashActivity

功能实现：

1、倒计时变成0时，自动跳转：Handler、Timer、CountDownTimer

2、SharedPreferences记录是否首次启动app：首次跳转引导页，否则跳转主页

SplashActivity:

public class SplashActivity extends AppCompatActivity {    public static final int MSG_UPDATE_TIME = 1;    // 时间间隔1s    public static final int INTERNAL_TIME = 1000;    // 配置文件名    public static final String CONGIF_NAME = "app_config";    // 配置文件中的一个配置项：是否首次启动    public static final String IS_FIRST_LOGIN = "is_first_login";    // 倒计时，初始5s    private int mCountDownTime = 5;    protected TextView mCountDownTv;    private Handler mHandler = new Handler(new Handler.Callback() {        // 接收发送的消息        @Override        public boolean handleMessage(Message msg) {            switch (msg.what) {                case MSG_UPDATE_TIME:// 更新时间                    if (mCountDownTime > 0) {                        mCountDownTv.setText(--mCountDownTime + "s");                        // 每次更新完UI界面，都会在1s后发送消息，通知继续下一次的更新                        mHandler.sendEmptyMessageDelayed(MSG_UPDATE_TIME, INTERNAL_TIME);                    } else {//                        Toast.makeText(SplashActivity.this, "OK", Toast.LENGTH_SHORT).show();                        startOtherActivity();                    }                    break;            }            return true;        }    });    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        super.setContentView(R.layout.activity_splash);        initView();        // 使用handler每隔1s发送一次消息，通知textView刷新UI界面        mHandler.sendEmptyMessageDelayed(MSG_UPDATE_TIME, INTERNAL_TIME);    }    private void initView() {        mCountDownTv = (TextView) findViewById(R.id.count_down_tv);    }    // 跳转界面    private void startOtherActivity() {        SharedPreferences sharedPreferences =                this.getSharedPreferences(CONGIF_NAME, Context.MODE_PRIVATE);        // 每次启动app都要检查是否首次启动        boolean isFirstLogin = sharedPreferences.getBoolean(IS_FIRST_LOGIN, true);        // 跳转        Intent intent = new Intent();        if (isFirstLogin) {// 跳转引导页            intent.setClass(this, GuideActivity.class);            // 从此不再是首次启动            SharedPreferences.Editor editor = sharedPreferences.edit();            editor.putBoolean(IS_FIRST_LOGIN, false);            editor.commit();        } else {// 跳转主界面            intent.setClass(this, MainActivity.class);        }        startActivity(intent);        // 关闭当前页面        finish();    }}

avtivity_Splash:

<RelativeLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="net.bwie.splashactivitydemo.activity.SplashActivity">    <TextView        android:id="@+id/count_down_tv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerInParent="true"        android:text="5s"/></RelativeLayout>