Question

我一直试图在我的基本应用程序中添加几秒延迟到我的活动交换，但每当我尝试时我都会收到错误。我的尝试是基于前一个帖子（How to put some delay in calling an activity from another activity?），但多次都没有成功。有人可以帮忙吗？

这是我的主要活动代码：

package winfield.joe.wind.v1;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.view.animation.BounceInterpolator;
import android.view.animation.ScaleAnimation;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.Toast;

public class MainActivity extends Activity {

    // public var
    private EditText text;

    // default function
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //localise this
        Toast.makeText(this, "onCreate!!", Toast.LENGTH_LONG).show();
        setContentView(R.layout.activity_main);
        // (EditText) = typecast
        text = (EditText) findViewById(R.id.userInput);
    }

        //Will be executed by clicking on the calculate button because we assigned "calc" to the "onClick" Property
        public void calc(View view) {

                    bounce(view, 0.95f);           

            RadioButton toKilometers = (RadioButton) findViewById(R.id.toKilometers);
            RadioButton toKnots = (RadioButton) findViewById(R.id.toKnots);

            if (text.getText().length() == 0) {
                // if the text field is empty show the message "enter a valid number" via toast message
                //ATTENTION:localise this
                Toast.makeText(this, "enter a valid number", Toast.LENGTH_LONG).show();
            } else {

                //int userInput = R.string.userInput;
                Intent i = new Intent(MainActivity.this, SecondActivity.class);
                //putExtra("userInput", userInput); 
                startActivity(i);

                // parse input Value from Text Field
                double inputValue = Double.parseDouble(text.getText().toString());
                // convert to...
                if (toKilometers.isChecked()) {
                    text.setText(String.valueOf(convertToKM(inputValue)));
                    // uncheck "to km" Button
                    toKilometers.setChecked(true);
                    // check "to knots" Button
                    toKnots.setChecked(false);
                } else { /* if toKnots button isChecked() */
                    text.setText(String.valueOf(convertToKnots(inputValue)));
                    // uncheck "to knots" Button
                    toKnots.setChecked(true);
                    // check "to km" Button
                    toKilometers.setChecked(false);
                }

            }

        }

    //bounce animation on button on-click
    public void bounce(View view, float amount) {
    ScaleAnimation anim = new ScaleAnimation(amount, 1f, amount, 1f);
    anim.setDuration(750);
    anim.setInterpolator(new BounceInterpolator());
    view.startAnimation(anim);
    }

    private double convertToKM(double inputValue) {
        // convert knots to km
        return (inputValue * 1.8);
    }

    private double convertToKnots(double inputValue) {
        // convert km to knots
        return (inputValue * 0.539956803);
    }

}

Answer 1

您可以使用处理程序：

    new Handler().postDelayed(new Runnable() {

        @Override
        public void run() {

            if(...) {
                // start here the other Activity
            }

            else {

                // do something else

            }

        }
    }, YOUR_TIME_OUT);

Answer 2

试试此代码

  new Handler().postDelayed(new Runnable() { 
        @Override public void run() { 
            //other code here Intent i = new Intent(MainActivity.this,SecondActivity.class); 
            startActivity(i); //other code here } }, 5000);

如何在我的应用中的活动之间添加几秒延迟？

2 个答案: