使用

第一種方案：自定義控件

1.在布局中使用

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:gravity="center"
    android:layout_height="
 
match_parent">

    <com.ywj.countdowntextviewdemo.CountDownTextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/countDownTextView"
        android:text="Hello World!" />
</RelativeLayout>

2.在Activity中獲取控件使用

  CountDownTextView countDownTextView = (CountDownTextView) findViewById(R.id.countDownTextView);
   countDownTextView.setCountDownMillis(
 
5000);
   countDownTextView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.e("MainActivity","點擊事件");
            }
        });
   countDownTextView.start();

3.CountDownTextView.java

import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.ColorRes;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.widget.TextView;

 
/**
 * 倒計時TextView
 * Created by weijing on 2017-08-21 14:43.
 */

public class CountDownTextView extends TextView {

    /**
     * 提示文字
     */
    private String mHintText = "重新發送";

    /**
     * 倒計時時間
     */
    private long mCountDownMillis = 60_000;

    /**
     * 剩余倒計時時間
     */
    private long mLastMillis;
    /**
     * 間隔時間差(兩次發送handler)
     */
    private long mIntervalMillis = 1_000;
    /**
     * 開始倒計時code
     */
    private final int MSG_WHAT_START = 10_010;
    /**
     * 可用狀態下字體顏色Id
     */
    private int usableColorId = android.R.color.holo_blue_light;
    /**
     * 不可用狀態下字體顏色Id
     */
    private int unusableColorId = android.R.color.darker_gray;


    public CountDownTextView(Context context) {
        super(context);
    }

    public CountDownTextView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    public CountDownTextView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);

            switch (msg.what) {
                case MSG_WHAT_START:
//                    Log.e("l", mLastMillis + "");
                    if (mLastMillis > 0) {
                        setUsable(false);
                        mLastMillis -= mIntervalMillis;
                        mHandler.sendEmptyMessageDelayed(MSG_WHAT_START, mIntervalMillis);
                    } else {
                        setUsable(true);
                    }
                    break;
            }
        }
    };


    /**
     * 設置是否可用
     *
     * @param usable
     */
    public void setUsable(boolean usable) {


        if (usable) {
            //可用
            if (!isClickable()) {
                setClickable(usable);
                setTextColor(getResources().getColor(usableColorId));
                setText(mHintText);
            }
        } else {
            //不可用
            if (isClickable()) {
                setClickable(usable);
                setTextColor(getResources().getColor(unusableColorId));
            }
            setText(mLastMillis / 1000 + "秒後" + mHintText);
        }

    }

    /**
     * 設置倒計時顏色
     *
     * @param usableColorId   可用狀態下的顏色
     * @param unusableColorId 不可用狀態下的顏色
     */
    public void setCountDownColor(@ColorRes int usableColorId, @ColorRes int unusableColorId) {
        this.usableColorId = usableColorId;
        this.unusableColorId = unusableColorId;
    }

    /**
     * 設置倒計時時間
     *
     * @param millis 毫秒值
     */
    public void setCountDownMillis(long millis) {
        mCountDownMillis = millis;
    }

    /**
     * 開始倒計時
     */
    public void start() {
        mLastMillis = mCountDownMillis;
        mHandler.sendEmptyMessage(MSG_WHAT_START);
    }

    /**
     * 重置倒計時
     */
    public void reset() {
        mLastMillis = 0;
        mHandler.sendEmptyMessage(MSG_WHAT_START);
    }

    @Override
    public void setOnClickListener(@Nullable final OnClickListener onClickListener) {
        super.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                mHandler.removeMessages(MSG_WHAT_START);
                start();
                onClickListener.onClick(v);
            }
        });

    }

    @Override
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        mHandler.removeMessages(MSG_WHAT_START);
    }
}

第二種方案：工具類

1.在activity中使用

  TextView textView = (TextView) findViewById(R.id.textView);
      new CountDownUtil(textView)
                .setCountDownMillis(60_000L)//倒計時60000ms
                .setCountDownColor(android.R.color.holo_blue_light,android.R.color.darker_gray)//不同狀態字體顏色
                .setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Log.e("MainActivity","發送成功");
                    }
                })
                .start();

2.CountDownUtil.java

import android.os.Handler;
import android.os.Message;
import android.support.annotation.ColorRes;
import android.support.annotation.Nullable;
import android.view.View;
import android.widget.TextView;

import java.lang.ref.WeakReference;

/**
 * 倒計時工具
 * Created by weijing on 2017-08-22 11:50.
 */

public class CountDownUtil {
    /**
     * 開始倒計時code
     */
    private final int MSG_WHAT_START = 10_010;
    /**
     * 弱引用
     */
    private WeakReference<TextView> mWeakReference;
    /**
     * 倒計時時間
     */
    private long mCountDownMillis = 60_000;
    /**
     * 提示文字
     */
    private String mHintText = "重新發送";

    /**
     * 剩余倒計時時間
     */
    private long mLastMillis;

    /**
     * 間隔時間差(兩次發送handler)
     */
    private long mIntervalMillis = 1_000;

    /**
     * 可用狀態下字體顏色Id
     */
    private int usableColorId = android.R.color.holo_blue_light;
    /**
     * 不可用狀態下字體顏色Id
     */
    private int unusableColorId = android.R.color.darker_gray;


    private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);

            switch (msg.what) {
                case MSG_WHAT_START:
                    if (mLastMillis > 0) {
                        setUsable(false);
                        mLastMillis -= mIntervalMillis;
                        if (mWeakReference.get() != null) {
                            mHandler.sendEmptyMessageDelayed(MSG_WHAT_START, mIntervalMillis);
                        }
                    } else {
                        setUsable(true);
                    }
                    break;
            }
        }
    };

    public CountDownUtil(TextView textView) {
        mWeakReference = new WeakReference<>(textView);
    }

    public CountDownUtil(TextView textView, long countDownMillis) {
        mWeakReference = new WeakReference<>(textView);
        this.mCountDownMillis = countDownMillis;
    }

    public CountDownUtil setCountDownMillis(long countDownMillis) {
        this.mCountDownMillis = countDownMillis;
        return this;
    }


    /**
     * 設置是否可用
     *
     * @param usable
     */
    private void setUsable(boolean usable) {
        TextView mTextView = mWeakReference.get();
        if (mTextView != null) {
            if (usable) {
                //可用
                if (!mTextView.isClickable()) {
                    mTextView.setClickable(usable);
                    mTextView.setTextColor(mTextView.getResources().getColor(usableColorId));
                    mTextView.setText(mHintText);
                }
            } else {
                //不可用
                if (mTextView.isClickable()) {
                    mTextView.setClickable(usable);
                    mTextView.setTextColor(mTextView.getResources().getColor(unusableColorId));
                }
                String content = mLastMillis / 1000 + "秒後" + mHintText;
                mTextView.setText(content);

            }
        }
    }

    /**
     * 設置倒計時顏色
     *
     * @param usableColorId   可用狀態下的顏色
     * @param unusableColorId 不可用狀態下的顏色
     */
    public CountDownUtil setCountDownColor(@ColorRes int usableColorId, @ColorRes int unusableColorId) {
        this.usableColorId = usableColorId;
        this.unusableColorId = unusableColorId;
        return this;
    }

    /**
     * 開始倒計時
     */
    public CountDownUtil start() {
        mLastMillis = mCountDownMillis;
        mHandler.sendEmptyMessage(MSG_WHAT_START);
        return this;
    }

    public CountDownUtil setOnClickListener(@Nullable final View.OnClickListener onClickListener) {
        TextView mTextView = mWeakReference.get();
        if (mTextView != null)
            mTextView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    mHandler.removeMessages(MSG_WHAT_START);
                    start();
                    onClickListener.onClick(v);
                }
            });
        return this;
    }

    /**
     * 重置停止倒計時
     */
    public CountDownUtil reset() {
        mLastMillis = 0;
        mHandler.sendEmptyMessage(MSG_WHAT_START);
        return this;
    }

TextView textView = (TextView) findViewById(R.id.textView); new CountDownUtil(textView) .setCountDownMillis(60_000L)//倒計時60000ms .setCountDownColor(android.R.color.holo_blue_light,android.R.color.darker_gray)//不同狀態字體顏色 .setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Log.e("MainActivity","發送成功"); } }) .start();

Android 驗證碼倒計時兩種方案