示意圖
思路
自定義一個布局容器（SplashView），在這個布局容器中添加啟動頁圖片，倒計時控件等邏輯操作，也就是把啟動界面的一些相同的操作都封裝到該容器中，最后將容器添加到啟動界面 Activity 中。
具體實現
SimpleView 的完整代碼
public class SplashView extends FrameLayout {
ImageView splashImg; // 歡迎界面圖片控件
TextView skipBtn; // 歡迎界面倒計時／跳轉控件
int skipBtnSizeInDip = 35; // 跳轉控件的大小
int skipBtnMarginInDip = 15; // 跳轉控件的距離屏幕邊緣相對位置
int duration = 5; // 歡迎界面持續時間
int delayTime = 1000; // 計時器每隔 1 秒動作---更新倒計時數字
Activity activity; // 保存當前界面的 Activity ,并對當前 Activity 進行相關操作
GradientDrawable skipBtnBg = new GradientDrawable(); // 倒計時控件圓形背景圖
SplashViewOnClickListener listener = null; // 頁面動作接口
Handler handler = new Handler(); // 計時器管理者
Runnable runnable = new Runnable() {
@Override
public void run() {
// 每隔一秒更新倒計時控件文字，當倒計時結束，動作，移除歡迎界面內容，調用動作監聽器的界面跳轉方法
if (0 == duration) {
skipOutSplash();
return;
} else {
setDuration(--duration);
}
handler.postDelayed(runnable, delayTime);
}
};
String actUrl;
public void setActUrl(String actUrl) {
this.actUrl = actUrl;
}
public void setDuration(int duration) {
this.duration = duration;
skipBtn.setText(String.format("跳過\n%d s", duration));
}
public SplashView(@NonNull Activity context) {
super(context);
activity = context;
init();
}
public SplashView(@NonNull Activity context, @Nullable AttributeSet attrs) {
super(context, attrs);
activity = context;
init();
}
public SplashView(@NonNull Activity context, @Nullable AttributeSet attrs, @AttrRes int defStyleAttr) {
super(context, attrs, defStyleAttr);
activity = context;
init();
}
public void setListener(final SplashViewOnClickListener listener) {
if (null == listener)
return;
this.listener = listener;
splashImg.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
listener.splashImgClick(actUrl);
}
});
}
private void init() {
// 添加圖片控件，設置圖片鋪滿屏幕
splashImg = new ImageView(activity);
splashImg.setScaleType(ImageView.ScaleType.FIT_XY);
LayoutParams imgLayoutParams = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT);
addView(splashImg, imgLayoutParams);
splashImg.setClickable(true);
// 添加倒計時控件
skipBtn = new TextView(activity);
// 設置控件大小
int skipButtonSize = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
skipBtnSizeInDip, activity.getResources().getDisplayMetrics());
LayoutParams skipLayoutParams = new LayoutParams(skipButtonSize,
skipButtonSize);
// 設置控件相對位置
skipLayoutParams.gravity = Gravity.TOP|Gravity.RIGHT;
int skipButtonMargin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
skipBtnMarginInDip, activity.getResources().getDisplayMetrics());
skipLayoutParams.setMargins(0, skipButtonMargin, skipButtonMargin, 0);
skipBtnBg.setShape(GradientDrawable.OVAL); // 設置計時器控件背景圖片圓形
skipBtnBg.setColor(Color.parseColor("#66232323"));
skipBtn.setGravity(Gravity.CENTER);
skipBtn.setTextColor(activity.getResources().getColor(android.R.color.white));
skipBtn.setBackgroundDrawable(skipBtnBg);
skipBtn.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 10);
addView(skipBtn, skipLayoutParams);
skipBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
skipOutSplash();
}
});
setDuration(duration);
handler.postDelayed(runnable, delayTime); // 觸發器計時器
}
/**
* 顯示歡迎界面控件
*
* @params
* */
public static void showSplashView(Activity activity, Integer duration, String imgUrl,String actUrl,
Integer defaultImgResouse, SplashViewOnClickListener listener) {
// 獲取歡迎界面的容器對象
ViewGroup contentView = activity.getWindow().getDecorView().findViewById(android.R.id.content);
if (null == contentView || 0 == contentView.getChildCount()) {
throw new IllegalStateException("You should call showSplashView() after setContentView() in Activity instance");
}
// 創建 SplashView 對象，開始將圖片和文字添加到 layoutparams 中，計時器開始計時
SplashView splashView = new SplashView(activity);
// 定義 SplashView 布局大小
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams
(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
// 設置接口回調
splashView.setListener(listener);
splashView.setActUrl(actUrl);
if (null != duration)
splashView.setDuration(duration);
Drawable drawable = null;
if (null != defaultImgResouse) {
drawable = activity.getResources().getDrawable(defaultImgResouse);
}
// 通過 Glide 加載歡迎圖片
Glide.with(activity).load(imgUrl).error(drawable).placeholder(drawable).into(splashView.splashImg);
// 設置當前 activity 窗口的標記，充滿屏幕
activity.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
// 將 SplashView 添加到當前 Activity 布局界面
contentView.addView(splashView, params);
}
private void skipOutSplash() {
if (null != listener)
listener.splashSkipClick();
// 移除計時器
handler.removeCallbacks(runnable);
// 將 splashView 移除歡迎界面，設置動畫
final ViewGroup parent = (ViewGroup) this.getParent();
if (parent != null) {
ObjectAnimator animator = ObjectAnimator.ofFloat(this,"alpha",1.0f, 0.0f)
.setDuration(600);
animator.start();
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
}
});
animator.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animator) {
}
@Override
public void onAnimationEnd(Animator animator) {
parent.removeView(SplashView.this);
}
@Override
public void onAnimationCancel(Animator animator) {
parent.removeView(SplashView.this);
}
@Override
public void onAnimationRepeat(Animator animator) {
}
});
}
}
// 歡迎界面的動作監聽器
public interface SplashViewOnClickListener {
void splashImgClick(String actionUrl); // 點擊歡迎界面圖片跳轉到 actionUrl
void splashSkipClick(); // 點擊跳轉過歡迎界面進入主界面
}
}
在啟動界面 Activity 中
public class SplashActivity extends AppCompatActivity {
String imgUrl = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1505905221463&di=67cfa9f3a08a5359fa86a243fc6aebdb&imgtype=0&src=http%3A%2F%2Ff1.topitme.com%2F1%2Fed%2F14%2F1129731340b7414ed1o.jpg";
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);
SplashView.showSplashView(SplashActivity.this, 6, imgUrl,"點我上哪兒？", R.drawable.splash_df, new SplashView.SplashViewOnClickListener() {
@Override
public void splashImgClick(String actionUrl) {
Toast.makeText(SplashActivity.this, actionUrl, Toast.LENGTH_SHORT).show();
}
@Override
public void splashSkipClick() {
startActivity(new Intent(SplashActivity.this, MainActivity.class));
finish();
}
});
}
@Override
public void onBackPressed() {
// super.onBackPressed();
}
}
總結
在功能的實現過程中，我們通過代碼動態添加控件到布局容器，Handler 計時器管理者動態修改倒計時文字顯示，使用 Glide 加載圖片信息，通過創建接口監聽界面的動作。重點還是在通過代碼動態添加控件的過程。
