Question

我使用handler.postDelayed()方法重复延迟任务..这是我的代码;

final Handler handler = new Handler();
        handler.postDelayed(new Runnable() {
            @TargetApi(Build.VERSION_CODES.LOLLIPOP)
            public void run() {

            Toast.makeText(MapsActivity.this,pickup+" "+destination+" "+ Boolean.toString(requested),Toast.LENGTH_LONG).show();
}
}, 5000);

问题在于变量（拾取，目的地，请求），例如请求的boolean我在开始时将其声明为假，之后我将其设置为真在oncreate() ..并且在处理程序中它的值每5秒在true和false之间变化（这意味着新值和旧值之间的平均值）..与另一个相同的事情2个变量。

这是我的完整代码：

String pickup="/",destination="/";
Boolean requested=false;
int seats=0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);

        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);

        if(getIntent().getExtras()!=null)
        {



            if(getIntent().getExtras().getString("class").equals("request")){
                pickup = getIntent().getExtras().getString("pickup");
                destination = getIntent().getExtras().getString("destination");
                seats = getIntent().getExtras().getInt("seats");


                if (!pickup.equals("")&&!pickup.equals("/")&&!destination.equals("")&&!destination.equals("/")&&seats!=0){


                    requested=true;

                }

            }
}

        if (authenticate() == true) {
            final Handler handler = new Handler();
            handler.postDelayed(new Runnable() {
                @TargetApi(Build.VERSION_CODES.LOLLIPOP)
                public void run() {





                    Toast.makeText(MapsActivity.this,pickup+" "+destination+" "+ Boolean.toString(requested),Toast.LENGTH_LONG).show();



                    handler.postDelayed(this, 5000);
                }
            }, 5000); }}

Answer 1

handler.postDelayed（）没问题，如果你想要切换值，试试吧。 pickup =！pickup，destination =！destination，...

handler.postDelayed（）方法的问题

1 个答案: