main.xml中

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" 
android:background="#086A87">
 
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:orientation="horizontal"
    android:padding="10dp" >
 
    <EditText
        android:id="@+id/edtTimerValue"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:ems="10"
        android:hint="minutes"
        android:inputType="phone" />
 
    <Button
        android:id="@+id/btnStartTime"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="5dp"
        android:layout_weight="2"
        android:gravity="center"
        android:text="Start Timer" 
        android:background="@drawable/custombuttongreen"
        android:textColor="#fff"/>
 
    <Button
        android:id="@+id/btnStopTime"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="5dp"
        android:layout_weight="2"
        android:gravity="center"
        android:text="Stop Timer"
        android:visibility="gone" 
        android:background="@drawable/custombuttongreen"
        android:textColor="#fff"/>
 
</LinearLayout>
 
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:orientation="vertical" >
 
</LinearLayout>
 
 
 
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"  >
 
    <ProgressBar
    android:id="@+id/progressbar"
    android:layout_width="350dip"
    android:layout_height="350dip"
    android:indeterminate="false"
    android:progressDrawable="@drawable/circle"
    android:background="@drawable/circle_shape"
    style="?android:attr/progressBarStyleHorizontal"
    android:max="60"
    android:progress="0" />
 
    <TextView
    android:id="@+id/tvTimeCount"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    android:text="00:00" 
    android:textColor="#fff"
    android:textSize="60dip"/>
 
</RelativeLayout>

MainActivity.java

package com.tag.countdowntimer;
import com.tag.countdowntimer.R.drawable;
import android.R.color;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
 
public class MainActivity extends Activity implements OnClickListener {
 
int i=-1;
ProgressBar mProgressBar;
 
private Button buttonStartTime,buttonStopTime;
private EditText edtTimerValue;
private TextView textViewShowTime; // will show the time
private CountDownTimer countDownTimer; // built in android class
                                        // CountDownTimer
private long totalTimeCountInMilliseconds; // total count down time in
                                            // milliseconds
private long timeBlinkInMilliseconds; // start time of start blinking
private boolean blink; // controls the blinking .. on and off
 
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
 
    buttonStartTime = (Button) findViewById(R.id.btnStartTime);
    buttonStopTime = (Button) findViewById(R.id.btnStopTime);
    textViewShowTime = (TextView) findViewById(R.id.tvTimeCount);
    edtTimerValue = (EditText) findViewById(R.id.edtTimerValue);
 
    buttonStartTime.setOnClickListener(this);
    buttonStopTime.setOnClickListener(this);
 
    mProgressBar = (ProgressBar) findViewById(R.id.progressbar);
 
}
 
@Override
public void onClick(View v) {
    if (v.getId() == R.id.btnStartTime) {
        textViewShowTime.setTextAppearance(getApplicationContext(),R.style.normalText);
        setTimer();
 
        //Hides the Keyboard
        InputMethodManager imm = (InputMethodManager)getSystemService(
                  Context.INPUT_METHOD_SERVICE);
            imm.hideSoftInputFromWindow(edtTimerValue.getWindowToken(),0);
 
        buttonStopTime.setVisibility(View.VISIBLE);
        buttonStartTime.setVisibility(View.GONE);
        edtTimerValue.setVisibility(View.GONE);
        edtTimerValue.setText("");
        //textViewShowTime.setTextColor(color.white);
        //textViewShowTime.getContext();
        startTimer();
 
    } else if (v.getId() == R.id.btnStopTime) {
        countDownTimer.cancel();
        buttonStartTime.setVisibility(View.VISIBLE);
        buttonStopTime.setVisibility(View.GONE);
        edtTimerValue.setVisibility(View.VISIBLE);
    }
}
 
private void setTimer() {
    int time = 0;
    if (!edtTimerValue.getText().toString().equals("")) {
        time = Integer.parseInt(edtTimerValue.getText().toString());
    } else
        Toast.makeText(MainActivity.this,"Please Enter Minutes...",Toast.LENGTH_LONG).show();
 
    totalTimeCountInMilliseconds = 60 * time * 1000;
 
    timeBlinkInMilliseconds = 30 * 1000;
}
 
private void startTimer() {
    countDownTimer = new CountDownTimer(totalTimeCountInMilliseconds,500) {
        // 500 means,onTick function will be called at every 500
        // milliseconds
 
        @Override
        public void onTick(long leftTimeInMilliseconds) {
            long seconds = leftTimeInMilliseconds / 1000;
            //i++;
            //Setting the Progress Bar to decrease wih the timer
            mProgressBar.setProgress((int) (leftTimeInMilliseconds / 1000));
            textViewShowTime.setTextAppearance(getApplicationContext(),R.style.normalColor);
 
 
            if (leftTimeInMilliseconds < timeBlinkInMilliseconds) {
                textViewShowTime.setTextAppearance(getApplicationContext(),R.style.blinkText);
                // change the style of the textview .. giving a red
                // alert style
 
                if (blink) {
                    textViewShowTime.setVisibility(View.VISIBLE);
                    // if blink is true,textview will be visible
                } else {
                    textViewShowTime.setVisibility(View.INVISIBLE);
                }
 
                blink = !blink; // toggle the value of blink
            }
 
            textViewShowTime.setText(String.format("%02d",seconds / 60)
                    + ":" + String.format("%02d",seconds % 60));
            // format the textview to show the easily readable format
 
        }
 
        @Override
        public void onFinish() {
            // this function will be called when the timecount is finished
            textViewShowTime.setText("Time up!");
            textViewShowTime.setVisibility(View.VISIBLE);
            buttonStartTime.setVisibility(View.VISIBLE);
            buttonStopTime.setVisibility(View.GONE);
            edtTimerValue.setVisibility(View.VISIBLE);
        }
 
    }.start();
 
}
}

正常的定时器状态

当我输入1分钟

当我进入3分钟

进度条不是倒计时