【置顶】Android代码收藏（持续更新）
2017-12-28 本文已影响88人
Arison
EditText设置点击事件
有些时候搜索一些商品 为了美观会跳转到另一个页面进行搜索
所以需要支持edittext的点击事件，但是前提要让edittext失去焦点要不然会弹出软键盘
EditText seachEditText = (EditText) findViewById(R.id.my_chat_seach);
seachEditText.setFocusable(false);//让EditText失去焦点，然后获取点击事件
seachEditText.setOnClickListener(this);
Bitmap转File
public static File saveBitmapFile(Bitmap bitmap, String filepath) {
File file = new File(filepath);//将要保存图片的路径
try {
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bos);
bos.flush();
bos.close();
} catch (IOException e) {
e.printStackTrace();
}
return file;
}
ListView判断是否滚到顶部或者底部
mListView.setOnScrollListener(new OnScrollListener() {
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
if (firstVisibleItem == 0) {
View firstVisibleItemView = mListView.getChildAt(0);
if (firstVisibleItemView != null && firstVisibleItemView.getTop() == 0) {
Log.d("ListView", "##### 滚动到顶部 #####");
}
} else if ((firstVisibleItem + visibleItemCount) == totalItemCount) {
View lastVisibleItemView = mListView.getChildAt(mListView.getChildCount() - 1);
if (lastVisibleItemView != null && lastVisibleItemView.getBottom() == mListView.getHeight()) {
Log.d("ListView", "##### 滚动到底部 ######");
}
}
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
//do nothing
}
});
Android icon桌面图标更改无效的问题
方案一：Android icon正确更改，删除多余旧icon，clean项目
方案二：载app清除手机缓存，重启手机。
方案三：手机切换主题样式。由A主题换成B主题，再换回A主题
ListView滚动时itemview背景色变成黑色的解决方式
android:scrollingCache="false"
android:cacheColorHint="#00000000"
判断APP是否被打开
/**
* 判断程序是否打开
* @return
*/
public static boolean isRunningInForeground() {
boolean isActivityFound = false;
ActivityManager activityManager = (ActivityManager) MyApplication.getInstance().getSystemService(Context.ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo> services = activityManager
.getRunningTasks(1);
if (services.get(0).topActivity.getPackageName().toString()
.equalsIgnoreCase(MyApplication.getInstance().getPackageName().toString())) {
isActivityFound = true;
}
return isActivityFound;
}
Android WebView 电话，邮件UIR链接处理
webView.setWebViewClient(new WebViewClient(){
public boolean shouldOverrideUrlLoading(WebView view, String url) {
LogUtil.d(TAG,"转发url："+url);
if (url.startsWith(WebView.SCHEME_TEL) || url.startsWith("sms:") || url.startsWith(WebView.SCHEME_MAILTO)) {
try {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse(url));
mContext.startActivity(intent);
} catch (ActivityNotFoundException ignored) {
}
return true;
}
webView.loadUrl(url);
return true;
}
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
}
});
Android WebView网页端内部登录Cookies保持
@SuppressWarnings("static-method")
public void setCookiesEnabled(final boolean enabled) {
CookieManager.getInstance().setAcceptCookie(enabled);
}
@SuppressLint("NewApi")
public void setThirdPartyCookiesEnabled(final boolean enabled) {
if (Build.VERSION.SDK_INT >= 21) {
CookieManager.getInstance().setAcceptThirdPartyCookies(webView, enabled);
}else{
CookieManager.getInstance().setAcceptCookie(enabled);
}
}
Android WebView客户端登录传递Cookie给网页端
public void synCookies(Context context, String url) {
CookieSyncManager.createInstance(context);
CookieManager cookieManager = CookieManager.getInstance();
cookieManager.setAcceptCookie(true);
cookieManager.removeSessionCookie();//移除
cookieManager.setCookie(url, cookies);
CookieSyncManager.getInstance().sync();
}
浏览器URL链接打开本地APP，没有安装就调转下载界面。
Android
<!-- 启动页面 -->
<activity android:name=".ui.SplashActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
<action android:name="cat.ereza.customactivityoncrash.RESTART" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.VIEW"></action>
<category android:name="android.intent.category.DEFAULT"></category>
<category android:name="android.intent.category.BROWSABLE"></category>
<data android:scheme="app"
android:host="usoftchina.com">
</data>
</intent-filter>
</activity>
网页端
<html>
<head>
<meta charset="utf-8">
<script type="text/javascript">
window.onload = function()//用window的onload事件，窗体加载完毕的时候
{
if (navigator.userAgent.match(/(iPhone|iPod|iPad);?/i)) {
window.location.href = "com.baidu.tieba://";//ios url打开地址
window
.setTimeout(
function() {
window.location.href = "https://itunes.apple.com/cn/app/id477927812";//ios下载地址
}, 1000)
} else if (navigator.userAgent.match(/android/i)) {
window.location = "app://usoftchina.com";//android url打开地址
window
.setTimeout(
function() {
window.location.href = "http://shouji.baidu.com/software/23017307.html";//android 下载地址
}, 1000)
}
}
</script>
</head>
<body>
<!-- 测试打开移动APP -->
<!-- <a href="app://test0812">打开UU互联！[测试网页链接打开移动APP] 测试成功！ window.location</a> -->
</body>
</html>
注意：如果是从一个APP打开另外一个APP：
Uri uri = Uri.parse("app://usoftchina.com");
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);//如果不存在app://usoftchina.com 会产生异常，需处理
浏览器URL链接打开本地APP，调转指定界面传递参数
Android端-接收参数
public class IntentUrlActivity extends Activity {
private static final String TAG = "IntentUrlActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_intent_url);
Intent i_getvalue = getIntent();
String action = i_getvalue.getAction();
if(Intent.ACTION_VIEW.equals(action)){
Uri uri = i_getvalue.getData();
if(uri != null){
String pagekind = uri.getQueryParameter("pagekind");
String id= uri.getQueryParameter("id");
LogUtil.d(TAG,"pagekind:"+pagekind+" id:"+id);
if ("A".equals(pagekind)){
Intent intent=new Intent(this, SimpleWebActivity.class);
intent.putExtra("id",id);
intent.putExtra("url","https://www.baidu.com");
intent.putExtra("p","询价单");
startActivity(intent);
}
if ("B".equals(pagekind)){
Intent intent=new Intent(this, SimpleWebActivity.class);
intent.putExtra("id",id);
intent.putExtra("url","https://github.com");
intent.putExtra("p","公共询价单");
startActivity(intent);
}
if ("C".equals(pagekind)){
Intent intent=new Intent(this, SimpleWebActivity.class);
intent.putExtra("id",id);
intent.putExtra("url","https://www.jianshu.com/u/7cfc7246c714");
intent.putExtra("p","采购单");
startActivity(intent);
}
overridePendingTransition(0,0);
finish();
}
}
}
}
清单文件配置：
<activity android:name=".IntentUrlActivity">
<intent-filter>
<action android:name="android.intent.action.VIEW"></action>
<category android:name="android.intent.category.DEFAULT"></category>
<category android:name="android.intent.category.BROWSABLE"></category>
<data android:scheme="app"
android:host="usoftchina.com">
</data>
</intent-filter>
</activity>
网页端-传递参数
<html>
<head>
<meta charset="utf-8">
<script type="text/javascript">
window.onload = function()//用window的onload事件，窗体加载完毕的时候
{
var params=window.location.href;
//window.alert(params.split("?")[1]);
//document.write(params.split("?")[1]);
if (navigator.userAgent.match(/(iPhone|iPod|iPad);?/i)) {
window.location.href = "com.baidu.tieba://"+params.split("?")[1];//ios url打开地址
window
.setTimeout(
function() {
window.location.href = "https://itunes.apple.com/cn/app/id477927812";//ios下载地址
}, 1000)
} else if (navigator.userAgent.match(/android/i)) {
window.location.href = "app://usoftchina.com?"+params.split("?")[1];//android url打开地址
window
.setTimeout(
function() {
window.location.href = "http://shouji.baidu.com/software/23017307.html";//android 下载地址
}, 1000)
}
}
</script>
</head>
<body>
<!-- 测试打开移动APP -->
<!-- <a href="app://test0812">打开UU互联！[测试网页链接打开移动APP] 测试成功！ window.location</a> -->
</body>
</html>
WebView返回处理
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && mWebView.canGoBack()) {
mWebView.goBack();// 返回前一个页面
return true;
}
return super.onKeyDown(keyCode, event);
}
TextView设置和隐藏Drawableleft
image
