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SwipeMenuListView在ScrollView里上下滑动导致菜单不能显示完全的bug解决方法 public class NoRollSwipeMenuListView extends SwipeMenuListView {private GestureDetector mGestureDetector; public NoRollSwipeMenuListView(Context context) { super(context); mGestureDetector = new GestureDetector(context, onGestureListener); } public NoRollSwipeMenuListView(Context context, AttributeSet attrs) { super(context, attrs); mGestureDetector = new GestureDetector(context, onGestureListener); } public NoRollSwipeMenuListView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); mGestureDetector = new GestureDetector(context, onGestureListener); } public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST); super.onMeasure(widthMeasureSpec, expandSpec); } @Override public boolean onTouchEvent(MotionEvent ev) { boolean b = mGestureDetector.onTouchEvent(ev);// LogUtil.w("onTouchEvent", "mGestureDetector.onTouchEvent(ev)->" + b); return super.onTouchEvent(ev); } private GestureDetector.OnGestureListener onGestureListener = new GestureDetector.SimpleOnGestureListener() { //distanceX 左右滑动距离,左滑动正值,右滑动负值 //distanceY 上下滑动距离,上滑动正值,下滑动负值 @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { if (Math.abs(distanceY) >= Math.abs(distanceX)) {//上下滑动距离大于左右滑动距离,当作上下滑动// LogUtil.w("onScroll", "distanceX=" + distanceX + ":distanceY=" + distanceY);// LogUtil.w("onScroll", "true"); //上下滑动不做任何操作,在这里父ScrollView已经交出onTouch权限,否则如果权限在父ScrollView的话这里接收不到事件 //所以执行到这里是因为下面的setParentScrollAble(false);已经执行过了 return true; } //当滑动NoRollSwipeMenuListView的时候，让父ScrollView交出onTouch权限，也就是让父ScrollView停住不能滚动 setParentScrollAble(false);// LogUtil.w("onScroll", "false"); return false; } }; /** * 是否把滚动事件交给父ScrollView * * @param flag */ private void setParentScrollAble(boolean flag) { //这里的parentScrollView就是NoRollSwipeMenuListView外面的那个ScrollView// LogUtil.w("setParentScrollAble", "flag->" + flag); getParent().requestDisallowInterceptTouchEvent(!flag); }} -
SwipeMenuListView（仿IOS滑动菜单） 使用添加引用dependencies { compile 'com.baoyz.swipemenulistview:library:1.3.0' }1. 在layout xml中替换ListView<com.baoyz.swipemenulistview.SwipeMenuListView android:id="@+id/listView" android:layout_width="match_parent" android:layout_height="match_parent" />2. SwipeMenuCreator创建SwipeMenuCreator creator = new SwipeMenuCreator() { @Override public void create(SwipeMenu menu) { // create "open" item SwipeMenuItem openItem = new SwipeMenuItem( getApplicationContext()); // set item background openItem.setBackground(new ColorDrawable(Color.rgb(0xC9, 0xC9, 0xCE))); // set item width openItem.setWidth(dp2px(90)); // set item title openItem.setTitle("Open"); // set item title fontsize openItem.setTitleSize(18); // set item title font color openItem.setTitleColor(Color.WHITE); // add to menu menu.addMenuItem(openItem); // create "delete" item SwipeMenuItem deleteItem = new SwipeMenuItem( getApplicationContext()); // set item background deleteItem.setBackground(new ColorDrawable(Color.rgb(0xF9, 0x3F, 0x25))); // set item width deleteItem.setWidth(dp2px(90)); // set a icon deleteItem.setIcon(R.drawable.ic_delete); // add to menu menu.addMenuItem(deleteItem); } }; // set creator listView.setMenuCreator(creator);3. 添加点击事件listView.setOnMenuItemClickListener(new OnMenuItemClickListener() { @Override public boolean onMenuItemClick(int position, SwipeMenu menu, int index) { switch (index) { case 0: // open break; case 1: // delete break; } // false : close the menu; true : not close the menu return false; } });源码https://github.com/baoyongzhang/SwipeMenuListView
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android 自定义网络变化时全局提醒(转） 实现思路定时获取当前网络状态利用广播发送当前网络状态，并且触发网络状态改变的监听在baseActivity中实现网络状态改变的监听，并作出相应的响应（例如显示没有网络的布局）代码实现定义网络状态变化监听接口public interface CheckNetworkStatusChangeListener { /* 网络变化会调用 */ void onEvent(Status status); /** * 网络状态 * TYPE_UN_NETWORK 沒有网络 * TYPE_WIFI WiFi连接 * TYPE_MOBILE 移动数据 */ enum Status { TYPE_UN_NETWORK, TYPE_WIFI, TYPE_MOBILE, } }定义接收网络变化的广播public class CheckNetworkStatusChangeReceiver extends BroadcastReceiver { public static final String EVENT = "event"; public static final String ACTION="action"; private CheckNetworkStatusChangeListener mCheckNetworkStatusChangeListener; public CheckNetworkStatusChangeReceiver() { } public void setCheckNetworkStatusChangeListener(CheckNetworkStatusChangeListener mCheckNetworkStatusChangeListener) { this.mCheckNetworkStatusChangeListener = mCheckNetworkStatusChangeListener; } @Override public void onReceive(Context context, Intent intent) { CheckNetworkStatusChangeListener.Status mStatus = (CheckNetworkStatusChangeListener.Status) intent.getSerializableExtra(EVENT); mCheckNetworkStatusChangeListener.onEvent(mStatus); } }检测当前网络状态工具类public class NetworkUtil { /** * 获取当前网络类型 CheckNetworkStatusChangeListener.Status * * @return 返回网络类型 CheckNetworkStatusChangeListener.Status */ public static CheckNetworkStatusChangeListener.Status getNetworkConnectionType(Context context) { //获取连接管理器 ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); if (connectivityManager == null) return CheckNetworkStatusChangeListener.Status.TYPE_UN_NETWORK; //获取网络连接信息 NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo(); if (networkInfo != null && networkInfo.isAvailable()) { if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI) { return CheckNetworkStatusChangeListener.Status.TYPE_WIFI; } if (networkInfo.getType() == ConnectivityManager.TYPE_MOBILE) { return CheckNetworkStatusChangeListener.Status.TYPE_MOBILE; } } return CheckNetworkStatusChangeListener.Status.TYPE_UN_NETWORK; } }自定义Handler，发送广播public class SimpleHandler<T extends Activity> extends Handler { WeakReference<T> weakReference; public SimpleHandler(T t) { this.weakReference = new WeakReference<>(t); } @Override public void handleMessage(Message msg) { super.handleMessage(msg); if (weakReference.get() != null) { //发送广播 Intent mCheckNetworkIntent = new Intent(); mCheckNetworkIntent.setAction(CheckNetworkStatusChangeReceiver.ACTION); CheckNetworkStatusChangeListener.Status status= (CheckNetworkStatusChangeListener.Status) msg.obj; mCheckNetworkIntent.putExtra(CheckNetworkStatusChangeReceiver.EVENT,status); weakReference.get().sendBroadcast(mCheckNetworkIntent); } } }实现每秒检测1次网络状态，因为是耗时操作所有在子线程中去获取当前网络状态@Override protected void onResume() { super.onResume(); new Thread(mRunnable).start(); } Runnable mRunnable = new Runnable() { @Override public void run() { //实现每隔一秒检测一次网络 while (true){ try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } CheckNetworkStatusChangeListener.Status status = NetworkUtil.getNetworkConnectionType(BaseActivity.this); Message message = new Message(); message.obj = status; simpleHandler.sendMessage(message); } } };检测网络状态后发送Message到handle，handle去发送广播，这注意handle内存泄漏public class SimpleHandler<T extends Activity> extends Handler { WeakReference<T> weakReference; public SimpleHandler(T t) { this.weakReference = new WeakReference<>(t); } @Override public void handleMessage(Message msg) { super.handleMessage(msg); if (weakReference.get() != null) { //发送广播 Intent mCheckNetworkIntent = new Intent(); mCheckNetworkIntent.setAction(CheckNetworkStatusChangeReceiver.ACTION); CheckNetworkStatusChangeListener.Status status= (CheckNetworkStatusChangeListener.Status) msg.obj; mCheckNetworkIntent.putExtra(CheckNetworkStatusChangeReceiver.EVENT,status); weakReference.get().sendBroadcast(mCheckNetworkIntent); } } } BaseActivity完整代码public class BaseActivity extends AppCompatActivity implements CheckNetworkStatusChangeListener { private CheckNetworkStatusChangeReceiver mCheckNetworkStatusChangeReceiver; private String LOG = BaseActivity.class.getSimpleName(); private SimpleHandler<BaseActivity> simpleHandler; private NetworkStatusLayout mNetworkStatusLayout; private boolean checkNetworkStatusChangeListenerEnable=true; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); super.setContentView(R.layout.activity_base); init(); new Thread(mRunnable).start(); } @Override public void setContentView(int layoutResID) { LinearLayout mRootLayout = findViewById(R.id.root_linear_layout); //将网络状态view添加到根视图 mNetworkStatusLayout = new NetworkStatusLayout(this); //默认隐藏状态 mNetworkStatusLayout.setVisibility(View.GONE); mRootLayout.addView(mNetworkStatusLayout, new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)); //将子类的layout，添加到根目录 View mContentView = LayoutInflater.from(this).inflate(layoutResID, null); mRootLayout.addView(mContentView, new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); } private void init() { mCheckNetworkStatusChangeReceiver = new CheckNetworkStatusChangeReceiver(); mCheckNetworkStatusChangeReceiver.setCheckNetworkStatusChangeListener(this); IntentFilter mIntentFilter = new IntentFilter(); mIntentFilter.addAction(CheckNetworkStatusChangeReceiver.ACTION); registerReceiver(mCheckNetworkStatusChangeReceiver, mIntentFilter); simpleHandler = new SimpleHandler<BaseActivity>(this); } public void setCheckNetworkStatusChangeListenerEnable(boolean checkNetworkStatusChangeListener) { this.checkNetworkStatusChangeListenerEnable = checkNetworkStatusChangeListener; } @Override protected void onResume() { super.onResume(); } Runnable mRunnable = new Runnable() { @Override public void run() { //实现每隔一秒检测一次网络 while (true) { try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } CheckNetworkStatusChangeListener.Status status = NetworkUtil.getNetworkConnectionType(BaseActivity.this); Message message = new Message(); message.obj = status; simpleHandler.sendMessage(message); } } }; @Override public void onEvent(Status status) { Log.w(LOG, "status: " + status.name()); if (!checkNetworkStatusChangeListenerEnable) return; if (status == Status.TYPE_UN_NETWORK) { if (mNetworkStatusLayout.getVisibility() == View.GONE) mNetworkStatusLayout.setVisibility(View.VISIBLE); } else { if (mNetworkStatusLayout.getVisibility() == View.VISIBLE) mNetworkStatusLayout.setVisibility(View.GONE); } } @Override protected void onDestroy() { super.onDestroy(); unregisterReceiver(mCheckNetworkStatusChangeReceiver); simpleHandler.removeCallbacks(mRunnable); } } 那么下一步就是在onEvent()判断网络状态，没有网络时的页面提示<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:background="@color/gray" android:layout_height="50dp"> <TextView android:id="@+id/tv_network_status" android:layout_centerInParent="true" android:text="@string/not_network" android:textColor="@color/red" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </RelativeLayout>使用activity继承自BaseActivitypublic class MainActivity extends BaseActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); setTitle("我是首页"); } }源码下载链接: https://pan.baidu.com/s/1G0A1Irlk0Iw_DjtKPhrWUA 密码: jmfh
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android Button动态修改背景图 我们在布局文件中，设置Button的背景图片时，一般是通过如下方式<ImageButton android:id="@+id/buttonListTopMenuSave" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/detail_save" android:layout_centerVertical="true" android:layout_alignParentRight="true" />如果我们需要动态设置图片，可以通过如下方式buttonListTopMenuSave = findViewById(R.id.buttonListTopMenuSave); buttonListTopMenuSave.setBackgroundResource(R.drawable.detail_ok); buttonListTopMenuSave.setOnClickListener(this);
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android Button修改背景色 问题描述在修改Button的背景颜色时，始终无法修改颜色为设置的颜色，且颜色始终为默认的蓝紫色。比如如下定义一个椭圆形的按钮。样式btn_bg_red.xml<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android"> <solid android:color="@color/teal_200"/> <corners android:topLeftRadius="10dip" android:topRightRadius="10dip" android:bottomRightRadius="10dip" android:bottomLeftRadius="10dip" /> <!--圆角矩形白色背景--> </shape>MainActivity.xml<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="5dip" android:layout_weight="1" android:background="@drawable/btn_bg_red" android:textColor="@color/purple_200" android:gravity="center" android:text="圆角Button" /> </androidx.constraintlayout.widget.ConstraintLayout>可以看到，虽然修改了背景色，但是根本没起作用。解决默认的颜色设置来自于res/values/themes.xml与夜间模式（应该是）下的res/values-night/themes.xml修改为（或其它能够实现非默认颜色的主题）再次预览
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Android LinearLayout权重布局 Android开发时，我们经常使用ListView展示一些附属信息，比如文章标题下，可能显示作者、发布日期等信息。像人名可能比较短，而对于年月日时分秒的这种日期格式，显示就比较长，所以我们可以通过控制LinearLayout里面的权重，分配不同控件的宽度。<!-- 单据附属信息--> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center_vertical"> <!--收集人--> <LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="3" android:gravity="center_vertical"> <ImageView android:layout_width="16sp" android:layout_height="16sp" android:background="@drawable/list_item_user" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/textViewCollectedByName" android:text="@string/str_const_collected_by" android:textSize="@dimen/font_16" android:ellipsize="end"/> </LinearLayout> <!-- 收集时间--> <LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="8" android:gravity="center_vertical"> <ImageView android:layout_width="16sp" android:layout_height="16sp" android:background="@drawable/list_item_time" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/str_const_collect_time" android:id="@+id/textViewCollectedTime" android:textSize="@dimen/font_16" android:ellipsize="end"/> </LinearLayout> <!--科室--> <LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="4" android:gravity="center_vertical"> <ImageView android:layout_width="16sp" android:layout_height="16sp" android:background="@drawable/list_item_department" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/str_const_depart" android:id="@+id/textViewDepartmentName" android:textSize="@dimen/font_16" android:ellipsize="end" android:maxLines="1"/> </LinearLayout> </LinearLayout>实现权重，主要注意两个参数android:layout_width="0dp"和 android:layout_weight="3"$$ 控件1宽度 = 控件1权重/(控件1权重+控件2权重+...控件n权重) $$每个控件的占比，等于控件的权重/所有控件权重的和。
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