method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
需要配置因特网的权限
xml
Unexpected error while executing: am start -n "com.example.user.ypologismosmoriwn/com.example.user.ypologismosmoriwn.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER Error while Launching activity
因为我将那个 apk 冻结了，于是启动不了 activity
Fragment，类似于 iframe 的使用方式
1
在 layout 中新建 Activvity->Fragment+ViewModel 创建新页面
2
在主页面布局中 common 中就可以使用 fragment 控件了
Java get 请求
一定要注意 127.0.0.1 只能在本机用啊，最好养成用局域网 ip 的习惯
java
public static String getHtml(String path) throws Exception {
HttpURLConnection connection = null;
BufferedReader reader = null;
URL url = new URL(path);
connection = (HttpURLConnection) url.openConnection();
//设置请求方法
connection.setRequestMethod("GET");
//设置连接超时时间（毫秒）
connection.setConnectTimeout(5000);
//设置读取超时时间（毫秒）
connection.setReadTimeout(5000);
//返回输入流
InputStream in;
if(connection.getResponseCode()==HttpURLConnection.HTTP_OK){
in = connection.getInputStream();
}else{//读取错误流 错误了，但服务器还是返回了数据
in = connection.getErrorStream();
}
//读取输入流
reader = new BufferedReader(new InputStreamReader(in));
StringBuilder result = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
result.append(line);
}
return (result.toString());
}