public class MainActivity extends AppCompatActivity {
    int i=3;

Handler handler=new Handler(){
    @Override
    public void handleMessage(Message msg) {
        if (i<0){
            i--;
            handler.sendEmptyMessageDelayed(0,1000);
        }else{
	//跳转
            Intent intent=new Intent(MainActivity.this,Main2Activity.class);
            startActivity(intent);
            finish();
        }
    }
};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
	//发送消息
        handler.sendEmptyMessageDelayed(0,1000);

    }
}
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