Android菜鳥練習第十四課 自動計時的TimerButton

第一部分 Application部分

public class App extends Application {
    // 用於存放倒計時時間
    public static Map<String, Long> map;

}

第二部分 自定義控件TimmerButton部分

public class TimeButton extends Button implements OnClickListener {
    private long lenght = 60 * 1000;// 倒計時長度,這裏給了默認60秒
    private String textafter = "秒後重新獲取~";
    private String textbefore = "點擊獲取驗證碼~";
    private final String TIME = "time";
    private final String CTIME = "ctime";
    private OnClickListener mOnclickListener;
    private Timer t;
    private TimerTask tt;
    private long time;
    Map<String, Long> map = new HashMap<String, Long>();

    public TimeButton(Context context) {
        super(context);
        setOnClickListener(this);

    }

    public TimeButton(Context context, AttributeSet attrs) {
        super(context, attrs);
        setOnClickListener(this);
    }

    @SuppressLint("HandlerLeak")
    Handler han = new Handler() {
        public void handleMessage(android.os.Message msg) {
            TimeButton.this.setText(time / 1000 + textafter);
            time -= 1000;
            if (time < 0) {
                TimeButton.this.setEnabled(true);
                TimeButton.this.setText(textbefore);
                TimeButton.this.setBackgroundColor(Color.BLUE);
                clearTimer();
            }else{
                //正在變化中的背景設置
                TimeButton.this.setBackgroundColor(Color.YELLOW);
            }
        };
    };

    private void initTimer() {
        time = lenght;
        t = new Timer();
        tt = new TimerTask() {

            @Override
            public void run() {
                Log.e("yung", time / 1000 + "");
                han.sendEmptyMessage(0x01);
            }
        };
    }

    private void clearTimer() {
        if (tt != null) {
            tt.cancel();
            tt = null;
        }
        if (t != null)
            t.cancel();
        t = null;
    }

    @Override
    public void setOnClickListener(OnClickListener l) {
        if (l instanceof TimeButton) {
            super.setOnClickListener(l);
        } else
            this.mOnclickListener = l;
    }

    @Override
    public void onClick(View v) {
        if (mOnclickListener != null)
            mOnclickListener.onClick(v);
        initTimer();
        this.setText(time / 1000 + textafter);
        this.setEnabled(false);
        t.schedule(tt, 0, 1000);
    }

    /**
     * 和activity的onDestroy()方法同步
     */
    public void onDestroy() {
        if (App.map == null)
            App.map = new HashMap<String, Long>();
        App.map.put(TIME, time);
        App.map.put(CTIME, System.currentTimeMillis());
        clearTimer();
        Log.e("yung", "onDestroy");
    }

    /**
     * 和activity的onCreate()方法同步
     */
    public void onCreate(Bundle bundle) {
        Log.e("yung", App.map + "");
        if (App.map == null)
            return;
        if (App.map.size() <= 0)// 這裏表示沒有上次未完成的計時
            return;
        long time = System.currentTimeMillis() - App.map.get(CTIME)
                - App.map.get(TIME);
        App.map.clear();
        if (time > 0)
            return;
        else {
            initTimer();
            this.time = Math.abs(time);
            t.schedule(tt, 0, 1000);
            this.setText(time + textafter);
            this.setEnabled(false);
        }
    }

    /** * 設置計時時候顯示的文本 */
    public TimeButton setTextAfter(String text1) {
        this.textafter = text1;
        return this;
    }

    /** * 設置點擊之前的文本 */
    public TimeButton setTextBefore(String text0) {
        this.textbefore = text0;
        this.setText(textbefore);
        return this;
    }

    /**
     * 設置到計時長度
     *
     * @param lenght
     *            時間 默認毫秒
     * @return
     */
    public TimeButton setLenght(long lenght) {
        this.lenght = lenght;
        return this;
    }
}

第三部分 Activity部分

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    TimeButton v;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        v = (TimeButton) findViewById(R.id.btn);
        v.setBackgroundColor(Color.BLUE);
        v.onCreate(savedInstanceState);
        v.setTextAfter("秒後重新獲取").setTextBefore("點擊獲取驗證碼").setLenght(15 * 1000);
        v.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        Toast.makeText(MainActivity.this, "這是處理調用者onclicklistnenr",
                Toast.LENGTH_SHORT).show();
    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        v.onDestroy();
        super.onDestroy();
    }
}

第四部分 佈局部分

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.liying.timebutton.MainActivity">

    <com.example.liying.timebutton.TimeButton
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!" />
</RelativeLayout>