屬性中

private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case 1:
                    Intent intent = new Intent(IntroduceActivity.this, MainActivity.class);
                    startActivity(intent);
                    break
 
;
                default:
                    break;
            }
        }
    };

onCreate()

 mHandler.sendEmptyMessageDelayed(1, 3000);

All

public class IntroduceActivity extends Activity implements View.OnClickListener{
    private TextView mTvGoClasstime;
    private TextView mTvBackClasstime;
    private
 
 TextView mTvClassName;
    private TextView mTvTeacher;
    private Button mBtGo;


    private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case 1:
                    Intent intent = new
 
 Intent(IntroduceActivity.this, MainActivity.class);
                    startActivity(intent);
                    break;
                default:
                    break;
            }
        }
    };


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_introduce);
        inits();
    }

    private void inits() {
        mTvGoClasstime = (TextView) findViewById(R.id.tv_go_classtime);
        mTvBackClasstime = (TextView) findViewById(R.id.tv_back_classtime);
        mTvClassName = (TextView) findViewById(R.id.tv_class_name);
        mTvTeacher = (TextView) findViewById(R.id.tv_teacher);
        mBtGo = (Button) findViewById(R.id.bt_go);
        mBtGo.setOnClickListener(this);

        mHandler.sendEmptyMessageDelayed(1, 3000);

    }
    private void delay(int ms){
        try {
            Thread.currentThread();
            Thread.sleep(ms);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onClick(final View v) {
        switch (v.getId()) {
            case R.id.bt_go:

                break;

            default:

                break;
        }

    }
}