Android中实现倒计时

1.需求

弹出提示的dialog，实现倒计时，结束后关闭dialog

2.dialog界面布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="500dp"
    android:layout_height="match_parent"
    android:layout_gravity="center_horizontal"
    android:orientation="vertical">
    <TextView
        android:id="@+id/counter"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/greater_magrin_space"
        android:gravity="center"
        android:text="10s"
        android:textSize="@dimen/content_text_size_standard"/>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/greater_magrin_space"
        android:gravity="center"
        android:text="@string/title_sale"
        android:textSize="@dimen/content_text_size_standard"/>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/content_header_space"
        android:gravity="center"
        android:text="@string/processing"
        android:textSize="@dimen/content_text_size_standard"/>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="@dimen/greater_magrin_space" />

</LinearLayout>

3.AndroidManifest.xml文件设置

<activity android:name=".ProcessingDialogActivity"
    android:label="@string/app_name"
    android:theme="@android:style/Theme.Holo.Light.Dialog.NoActionBar"
    android:screenOrientation="portrait"/>

4.ProcessingDialogActivity实现

另开一个线程实现倒计时功能不占用UI线程

public class ProcessingDialogActivity extends Activity{
    private TextView counter;
    private int count = 10;
    private boolean isEnd = false;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_processingdialog);

        counter = (TextView)findViewById(R.id.counter);
        new Thread(new CounterThread()).start();
    }
    Handler handler = new Handler(){
        public void handleMessage(Message message){
            switch (message.what){
                case 0:
                    if (count == 0){
                        finish();
                    }
                    counter.setText(String.valueOf(count)+"s");
                    break;
                default:
                    break;
            }
        }
    };
    public class CounterThread implements Runnable{
        @Override
        public void run(){
            while (!isEnd){
                try {
                    Thread.sleep(1000);
                    count--;
                    if (count < 1){
                        isEnd = true;
                    }
                    Message msg = new Message();
                    msg.what = 0;
                    handler.sendMessage(msg);
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
        }
    }
}

效果如下图
aaarticlea/png;base64,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" 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