android 防朋友圈功能吗,android 防微信朋友圈TopBar状态栏渐变模式

说白了没啥高深的东西简单的一笔。。。。

首先呢弄一个ScrollView并并重写方法 onScrollChanged 监听滑动的状态，然后根据自己需求改变其状态。

其次，看代码：

public class ObservableScrollView extends ScrollView {

//底部图片

private View viewHeigh;

private View viewTopBar;

private View decor;

float f = -1;

int height;

private ScrollViewListener scrollViewListener = null;

public ObservableScrollView(Context context) {

super(context);

}

public ObservableScrollView(Context context, AttributeSet attrs) {

super(context, attrs);

}

public ObservableScrollView(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

// decor = this.getWindow().getDecorView();

}

public void setScrollViewListener(ScrollViewListener listener) {

this.scrollViewListener = listener;

}

@Override

protected void onScrollChanged(int x, int y, int oldx, int oldy) {

super.onScrollChanged(x, y, oldx, oldy);

setalph(y);

// if(scrollViewListener != null) {

// scrollViewListener.onScrollChanged(this, x, y, oldx, oldy);

// }

}

private void setalph(int y){

if (height == 0) {

height = viewHeigh.getMeasuredHeight()-viewTopBar.getMeasuredHeight();

} else if (y <= height*2/3) {

setTopBar(0);

} else if (y <= height) {

if (y < 0) {

y = 0;

}

f = (float) (y-height*2/3) / (float) (height/3);

if(f<0.2){

f = 0;

}

if (f > 1) {

f = 1;

}

setTopBar(f);

}else if(f<1){

f = 1;

setTopBar(f);

}

}

private void setTopBar(float f) {

viewTopBar.getBackground().setAlpha((int) (f * 255));

// 通知标题栏刷新显示

viewTopBar.invalidate();

if (decor == null) {

return;

}

//设置状态栏字体颜色

if (f > 0.5) {

decor.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);

} else {

decor.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR);

}

}

public void setViewBase(View viewHeigh,View viewTopBar,View window){

this.viewHeigh = viewHeigh;

this.viewTopBar = viewTopBar;

this.decor = window;

}

public interface ScrollViewListener {

void onScrollChanged(ObservableScrollView scrollView, int x, int y, int oldx, int oldy);

}

}

Activity代码：

public class FillScreenActivity extends BaseTwoActivity {

ObservableScrollView scrollView;

LinearLayout topBar;

ImageView view;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_myscrollview);

innitview();

}

private void innitview() {

scrollView = findViewById(R.id.myscrollview);

topBar = findViewById(R.id.tipbar_linea);

view = findViewById(R.id.toolbar_image);

topBar.getBackground().setAlpha(0);

topBar.setPadding(0,getStatusBarHeigh(),0,0);

scrollView.setViewBase(view,topBar,getWindow().getDecorView());

}

}

public class BaseTwoActivity extends AppCompatActivity {

private static String TAG = "BaseActivity";

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

this.requestWindowFeature(Window.FEATURE_NO_TITLE);//| Window.FEATURE_SWIPE_TO_DISMISS

setStatusBarTranslucent();

//一个创建、一个销毁时 exitAnim:预销毁的activity的动画

}

/**

* 设置透明状态栏

*

*/

private void setStatusBarTranslucent() {

/**

* 设置状态栏透明后： {windowIsTranslucent=(Manifest activity Theme中

* android:windowIsTranslucent=true/false)}

* 1：windowIsTranslucent对其不能产生任何影响 2：windowIsTranslucent

* 可以解决弹出键盘时暂时出现的黑屏问题 3：xml中 fitsSystemWindows 能产生效果(状态栏空出自然色)

*/

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {

Window window = getWindow();

window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS

| WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);

window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN

| View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR);

window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);

window.setStatusBarColor(Color.TRANSPARENT);

window.setNavigationBarColor(Color.TRANSPARENT);

} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {

setTranslucentStatus(true);

// 透明状态栏

getWindow().addFlags(

WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);

// // 透明导航栏

// getWindow().addFlags(

// WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);

// 让虚拟导航栏一直不显示

// Window window = getWindow();

// WindowManager.LayoutParams params = window.getAttributes();

// params.systemUiVisibility =

// View.SYSTEM_UI_FLAG_HIDE_NAVIGATION|View.SYSTEM_UI_FLAG_IMMERSIVE;

// window.setAttributes(params);

}

}

/**

* 获取状态栏高度

*

* @return

*/

public int getStatusBarHeigh() {

/**

* 获取状态栏高度——方法1

* */

int statusBarHeight1 = -1;

// 获取status_bar_height资源的ID

int resourceId = getResources().getIdentifier("status_bar_height",

"dimen", "android");

if (resourceId > 0) {

// 根据资源ID获取响应的尺寸值

statusBarHeight1 = getResources().getDimensionPixelSize(resourceId);

}

if (statusBarHeight1 != -1) {

return statusBarHeight1;

} else {

/**

* 获取状态栏高度——方法3 应用区的顶端位置即状态栏的高度 *注意*该方法不能在初始化的时候用

* */

Rect rectangle = new Rect();

getWindow().getDecorView().getWindowVisibleDisplayFrame(rectangle);

return rectangle.top;

}

}

}

大功告成。