首先要把歡迎畫面的Activity設為最先執行的Activity

 

<application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.demo.welcome.WelComeActivity"
            android:windowSoftInputMode="stateAlwaysHidden|adjustResize" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.demo.MainActivity"
            android:screenOrientation="portrait" >
        </activity>
 
然後在歡迎畫面的Activity裡
 
public class WelComeActivity extends Activity {
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mHandler.sendEmptyMessageDelayed(GOTO_MAIN_ACTIVITY, 3000);//3秒跳轉
    }
    private static final int GOTO_MAIN_ACTIVITY = 0;
    private Handler mHandler = new Handler(){
        public void handleMessage(android.os.Message msg) {
 
            switch (msg.what) {
                case GOTO_MAIN_ACTIVITY:
                    Intent intent = new Intent();
                    intent.setClass(WelComeActivity.this, MainActivity.class);
                    startActivity(intent);
                    finish();
                    break;
 
                default:
                    break;
            }
        };
    };

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