android倒数方法实现

最新推荐文章于 2020-05-29 12:21:25 发布

sinat_30535273

最新推荐文章于 2020-05-29 12:21:25 发布

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文章标签： android

本文链接：https://blog.youkuaiyun.com/sinat_30535273/article/details/75528517

本文详细介绍了在Android平台上如何实现倒计时功能，通过示例代码展示关键步骤，适用于开发者快速理解和应用。

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代码如下

package com.bfzs.smartapplication.FirstLogin;

import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.TextView;

import com.bfzs.smartapplication.R;

/**
 * Created by Administrator on 2017/7/20.
 */

public class GetValidationCodeActivity extends AppCompatActivity {

    private Toolbar mToolbar;
    private TextView mTextView;
    private TextView mBackCount;
    private Handler handler;
    private int second = 60;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_getvalidationcode);

        initView();


    }

    private void initView() {

        handler = new Handler();
        mTextView = (TextView) findViewById(R.id.activity_getvalidationcode_number);
        mBackCount = (TextView) findViewById(R.id.activity_getvalidationcode_backcount);
        mBackCount.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                handler.post(BackCountRun);
            }
        });

        Intent intent = getIntent();
        String i = intent.getStringExtra("PhoneNumber");
        mTextView.setText(i);
//        String i = bundle.getString("PhoneNumber");
//        mTextView.setText(i);

        handler.post(BackCountRun);


    }

    Runnable BackCountRun = new Runnable() {
        @Override
        public void run() {
            if (second > 0){
                mBackCount.setText("重新发送(" + second + "s)");
                mBackCount.setTextColor(getResources().getColor(R.color.gray));
                handler.postDelayed(BackCountRun,1000);
                mBackCount.setClickable(false);
                second = second - 1;
            }else{
                second = 60;
                mBackCount.setClickable(true);
                mBackCount.setTextColor(getResources().getColor(R.color.blue));
                mBackCount.setText("重新发送");
            }
        }
    };

}

关键是在Runnable中设定重复打开，加判断