Android 启动页倒计时

前言

 实现的逻辑很简单，谷歌给我们提供了倒计时很方便，配合基本活动之间的跳转完成，注意声明该有的权限

布局

• activity_main

  <?xml version="1.0" encoding="utf-8"?>
  <android.support.constraint.ConstraintLayout     
      xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      tools:context=".MainActivity">
  
  <ImageView
      android:id="@+id/main_image_001"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:scaleType="fitXY" />
  </android.support.constraint.ConstraintLayout>
  

• activity_main2

  <?xml version="1.0" encoding="utf-8"?>
  <android.support.constraint.ConstraintLayout       
      xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      tools:context=".Main2Activity">
  
  <LinearLayout
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:orientation="vertical"
      tools:ignore="MissingConstraints">
  
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1">
  
        <ImageView
            android:id="@+id/main2_image_001"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="fitXY"
            tools:srcCompat="@tools:sample/backgrounds/scenic[0]" />
  
        <TextView
            android:id="@+id/main2_text_001"
            android:onClick="A"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentStart="true"
            android:layout_alignParentTop="true"
            android:layout_marginStart="300dp"
            android:layout_marginTop="20dp"
            android:gravity="center"
            android:text="TextView"
            android:textColor="#000"
            android:textSize="20sp"
            tools:ignore="OnClick" />
    </RelativeLayout>
  
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="150dp"
        android:gravity="center"
        android:layout_weight="1" >
  
        <ImageView
            android:id="@+id/main2_image_002"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:scaleType="fitXY" />
  
        <TextView
            android:id="@+id/main2_text_002"
            android:textSize="20sp"
            android:textColor="#000"
            android:gravity="center"
            android:layout_marginStart="20dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="图片框架" />
        </LinearLayout>
      </LinearLayout>
   </android.support.constraint.ConstraintLayout>
  

代码

• MainActivity

  import android.content.Intent;
  import android.os.CountDownTimer;
  import android.support.v7.app.AppCompatActivity;
  import android.os.Bundle;
  import android.view.Window;
  import android.view.WindowManager;
  import android.widget.ImageView;
  import com.bumptech.glide.Glide;
  
  public class MainActivity extends AppCompatActivity {
  
  @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getSupportActionBar().hide();// 隐藏ActionBar
    setContentView(R.layout.activity_main);
    Window window = getWindow();
    window.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
    init();
    timer.start();
  }
  
  public void init() {
    ImageView iv = findViewById(R.id.main_image_001);
    Glide
            .with(this)
            .load("http://p1.so.qhimgs1.com/bdr/575__/t017dd6c89c1d818a2d.jpg")
            .into(iv);
  }
  
  CountDownTimer timer = new CountDownTimer(2000, 1000){
      @Override
      public void onTick(long sin) {
  
    }
  
    @Override
    public void onFinish() {
        Intent intent=new Intent(MainActivity.this, Main2Activity.class);
        startActivity(intent);
          }
      };
  }
  

• Main2Activity

  import android.annotation.SuppressLint;
  import android.os.CountDownTimer;
  import android.support.v7.app.AppCompatActivity;
  import android.os.Bundle;
  import android.view.View;
  import android.view.Window;
  import android.view.WindowManager;
  import android.widget.ImageView;
  import android.widget.TextView;
  import android.widget.Toast;
  
  import com.bumptech.glide.Glide;
  
  public class Main2Activity extends AppCompatActivity {
  
      TextView lote,time;
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          getSupportActionBar().hide();// 隐藏ActionBar
          setContentView(R.layout.activity_main2);
          Window window = getWindow();
          window.addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
          init();
          timer.start();
      }
  
      public void init() {
          time = findViewById(R.id.main2_text_001);
          lote = findViewById(R.id.main2_text_002);
          ImageView logo = findViewById(R.id.main2_image_001);
          ImageView test = findViewById(R.id.main2_image_002);
          Glide
                .with(this)
                .load("http://p1.so.qhimgs1.com/bdr/575__/t017dd6c89c1d818a2d.jpg")
                .into(logo);
          Glide
                .with(this)
                .load("http://p1.so.qhimgs1.com/bdr/575__/t017dd6c89c1d818a2d.jpg")
                .into(test);
    }
  
      CountDownTimer timer = new CountDownTimer(5000, 1000){
          @SuppressLint("SetTextI18n")
          @Override
          public void onTick(long sin) {
              time.setText("跳过(" + sin/1000 + "）");
          }
  
          @Override
          public void onFinish() {
              Toast.makeText(Main2Activity.this, "倒计时完成，下一步跳转主页" ,          Toast.LENGTH_SHORT).show();
  
        }
    };
  
    public void A(View v){
        timer.cancel();
        Toast.makeText(Main2Activity.this, "倒计时终止，下一步跳转主页" ,       Toast.LENGTH_SHORT).show();
      }
  }
  

• 备注

  拥有完全的网络访问权限：
  <uses-permission android:name="android.permission.INTERNET" />
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
  
  注意Github上的Glide图片框架，添加依赖：
  dependencies {
    ...
    implementation 'com.github.bumptech.glide:glide:3.7.0'
    ...
  }