Android开发Tips(3)

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我会介绍关于Android的一些有趣的小知识点. 本文是第三篇, 其余第一篇, 第二篇.

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1. UIAutomatorViewer

自动化测试是Android测试的趋势, 稳定\复用, 最常用的工具就是Espresso.
使用UIAutomatorViewer获取资源的Id,
位置/android-sdk/tools/uiautomatorviewer, 点击即可使用.

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2. GitHub标签

网址, 比如:

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3. 有趣的修改SVG库

地址, 加载SVG格式的图片, 修改颜色属性.

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4. 请求和生成的Json插件

JSONOnlineViewer, 网络请求插件, 获取Json数据, 位置View->JSONViewer.
GsonFormat, 根据Json自动生成类的插件, 在Command+N里面.

附一张插件的截图, 其他随意.

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5. Retrofit2+Okhttp3的Interceptor设置方式

Retrofit升级到beta3版本, 使用了最新Okhttp3, Interceptor的设置方式发生改变.

旧版

OkHttpClient client = new OkHttpClient().Builder();    HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();  loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BASIC);  MarvelSigningInterceptor signingInterceptor = new MarvelSigningInterceptor(      BuildConfig.MARVEL_PUBLIC_KEY, BuildConfig.MARVEL_PRIVATE_KEY);    client.interceptors().add(signingInterceptor);  client.interceptors().add(loggingInterceptor);

替换, 新版

        HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();          loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BASIC);            MarvelSigningInterceptor signingInterceptor = new MarvelSigningInterceptor(                  BuildConfig.MARVEL_PUBLIC_KEY, BuildConfig.MARVEL_PRIVATE_KEY);            OkHttpClient client = new OkHttpClient.Builder()                  .addInterceptor(signingInterceptor)                  .addInterceptor(loggingInterceptor)                  .build();

否则可能会发生: HTTP 409 Conflict, 未输入正确的验证方式, 私钥错误.

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6. okhttp-logging-interceptor输出log信息

参考, 可以输出log信息, 使用, 当前版本是3.0.1.

compile "com.squareup.okhttp3:logging-interceptor:${libs.okhttp}"

输出参考:

D/OkHttp: <-- 200 OK http://gateway.marvel.com/v1/public/characters?offset=0&... (1552ms, unknown-length body)

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7. 透明statusbar和全屏ImageView

status bar设置成为透明颜色.

    <style name="AppTheme.NoStatusBar">          <item name="android:windowTranslucentStatus">true</item>      </style>

页面的根布局是CollapsingToolbarLayout.

<android.support.design.widget.CollapsingToolbarLayout      xmlns:android="http://schemas.android.com/apk/res/android"      android:layout_width="match_parent"      android:layout_height="match_parent"      android:fitsSystemWindows="true">        <ImageView          android:layout_width="match_parent"          android:layout_height="match_parent"          android:contentDescription="@null"          android:fitsSystemWindows="true"          android:scaleType="centerCrop"          android:src="@drawable/christmas"/>    </android.support.design.widget.CollapsingToolbarLayout>

效果

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8. Android Studio模板

位置: File->Other Settings->Default Settings->Editor->Live Templates
熟练之后, 根据简写+Tab就可以使用了, 当然也可以自己添加.

自定义模板:
缩写(Abbreviation), 描述(Description), 内容(Template text), 应用场景, 格式化.

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9. 推荐动画效果的网站

网址, 网站里面有很多好玩的动画效果, 而且都是编程实现, 方便移植, 如雪花效果.

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10. ListView的ViewHolder

Android官方推荐使用RecyclerView代替ListView, 但是很多守旧的人不想这么做, 那么, 也需要使用ViewHolder提升加载速度. 参考.

基本用法.

static class ViewHolder() {      TextView testName;      TextView testDesc;  }    ...    @Override  public View getView(int position, View convertView, ViewGroup parent) {      View rowView = convertView;        // 初始化ViewHolder      if (convertView == null) {          LayoutInflater inflater = (LayoutInflater) parent.getContext()              .getSystemService(Context.LAYOUT_INFLATER_SERVICE);          rowView = inflater.inflate(R.layout.view_test_row, parent, false);          ViewHolder viewHolder = new ViewHolder();          viewHolder.testName = (TextView) rowView.findViewById(R.id.test_tv_name);          viewHolder.testDesc = (TextView) rowView.findViewById(R.id.test_tv_desc);          rowView.setTag(viewHolder);      }        // 使用ViewHolder      ViewHolder holder = (ViewHolder) rowView.getTag();      holder.testName.setText("Test: " + position);      holder.testDesc.setText("This is number " + position + ". ");        return rowView;  }

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OK, that’s all! Enjoy it.