abstract：本文給大家分享android中不用線程如何實(shí)現(xiàn)倒計(jì)時(shí)功能，非常不錯(cuò)，具有參考借鑒價(jià)值，需要的朋友參考下需求：有多個(gè)組件可以開啟倒計(jì)時(shí)，正常情況下默認(rèn)倒計(jì)時(shí)時(shí)間終了后更新UI，另，用戶可以取消指定倒計(jì)時(shí)。這里使用CountDownTimer進(jìn)行倒計(jì)時(shí)，其中回調(diào)函數(shù)onFinish是在倒計(jì)時(shí)終了時(shí)回調(diào)，onTick是在倒計(jì)時(shí)開始時(shí)回調(diào)，用戶可以使用CountDownTimer對(duì)象的cancel方法取消
本文給大家分享android中不用線程如何實(shí)現(xiàn)倒計(jì)時(shí)功能，非常不錯(cuò)，具有參考借鑒價(jià)值，需要的朋友參考下
需求：
有多個(gè)組件可以開啟倒計(jì)時(shí)，正常情況下默認(rèn)倒計(jì)時(shí)時(shí)間終了后更新UI，另，用戶可以取消指定倒計(jì)時(shí)。
這里使用CountDownTimer進(jìn)行倒計(jì)時(shí)，其中回調(diào)函數(shù)onFinish是在倒計(jì)時(shí)終了時(shí)回調(diào)，onTick是在倒計(jì)時(shí)開始時(shí)回調(diào)，用戶可以使用CountDownTimer對(duì)象的cancel方法取消倒計(jì)時(shí)。
這樣做的好處：不需要使用繁瑣的線程去控制倒計(jì)時(shí)，更方便的進(jìn)行UI更新。
上代碼：
MainActivity
package test.demo.countdowntest;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private Button bt1, bt2, bt3;
private ProgressBar pb1, pb2, pb3;
private MyCount mc1,mc2, mc3;
private boolean mc1Click = false;
private boolean mc2Click = false;
private boolean mc3Click = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bt1 = ((Button) findViewById(R.id.bt1));
bt2 = ((Button) findViewById(R.id.bt2));
bt3 = ((Button) findViewById(R.id.bt3));
bt1.setOnClickListener(this);
bt2.setOnClickListener(this);
bt3.setOnClickListener(this);
pb1 = ((ProgressBar) findViewById(R.id.pb1));
pb2 = ((ProgressBar) findViewById(R.id.pb2));
pb3 = ((ProgressBar) findViewById(R.id.pb3));
mc1 = new MyCount(30000, 1000);
mc1.setPb(bt1, pb1);
mc2 = new MyCount(30000, 1000);
mc2.setPb(bt2, pb2);
mc3 = new MyCount(30000, 1000);
mc3.setPb(bt3, pb3);
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.bt1:
if (mc1Click) {
mc1.cancel();
pb1.setVisibility(View.GONE);
mc1Click = false;
} else {
pb1.setVisibility(View.VISIBLE);
mc1.start();
mc1Click = true;
}
break;
case R.id.bt2:
if (mc2Click) {
pb2.setVisibility(View.GONE);
mc2.cancel();
mc2Click = false;
} else {
pb2.setVisibility(View.VISIBLE);
mc2.start();
mc2Click = true;
}
break;
case R.id.bt3:
if (mc3Click) {
pb3.setVisibility(View.GONE);
mc3.cancel();
mc3Click = false;
} else {
pb3.setVisibility(View.VISIBLE);
mc3.start();
mc3Click = true;
}
break;
}
}
/*定義一個(gè)倒計(jì)時(shí)的內(nèi)部類*/
class MyCount extends CountDownTimer {
Button mBt;
ProgressBar mPb;
public MyCount(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);
}
public void setPb(Button bt, ProgressBar pb) {
mBt = bt;
mPb = pb;
}
@Override
public void onFinish() {
mPb.setVisibility(View.GONE);
}
@Override
public void onTick(long millisUntilFinished) {
mBt.setText("請(qǐng)等待30秒(" + millisUntilFinished / 1000 + ")...");
Toast.makeText(MainActivity.this, millisUntilFinished / 1000 + "", Toast.LENGTH_LONG).show();
}
}
}activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout 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" android:orientation="vertical" tools:context="cn.sh.changxing.countdowntest.MainActivity"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:id="@+id/bt1" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="測(cè)試啟動(dòng)1"/> <ProgressBar android:id="@+id/pb1" style="?android:attr/progressBarStyleSmall" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:indeterminate="true"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:id="@+id/bt2" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="測(cè)試啟動(dòng)2"/> <ProgressBar android:id="@+id/pb2" style="?android:attr/progressBarStyleSmall" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:indeterminate="true"/> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:id="@+id/bt3" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="測(cè)試啟動(dòng)3"/> <ProgressBar android:id="@+id/pb3" style="?android:attr/progressBarStyleSmall" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:indeterminate="true"/> </LinearLayout> </LinearLayout>
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