阳光沙滩-让学习编程变得更加简单

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2024-07-05 18:28 · 1panel / minio / oss / java / 运维

Android开发Jetpack-Databinding基本使用官方文档地址：https://developer.android.com/topic/libraries/data-binding人类自从有Android系统以来，我们绑定数据从findViewById开始，需要强转控件类型，随着SDK的升级，不再需要强转类型。顺带还有黄油刀，就是为了简化我们的开发。我们可以不再使用findViewById去找控件，然后再设置数据了。如果数据更新了,还得重新设置。接下来我们就了解一下Databinding吧。所以接下来我们要通过Databinding实现一般页面的数据绑定，列表的数据绑定，图片的数据绑定等常见的场景。让你的项目支持Databindingandroid{...dataBinding{enabled=true}}基本使用先来一个布局，我们要显示用户的信息，包括姓名，年龄和性别创建bean类，用于封装用户数据packagecom.sunofbeaches.databindingdemo.domaindataclassUser(varname:String,varage:Int,vargender:Gender)enumclassGender{FEMALE,MALE}布局代码<?xmlversion="1.0"encoding="utf-8"?><layout><data><variablename="user"type="com.sunofbeaches.databindingdemo.domain.User"/></data><androidx.constraintlayout.widget.ConstraintLayoutxmlns: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"><androidx.constraintlayout.widget.Guidelineandroid:id="@+id/guideline"android:layout_width="wrap_content"android:layout_height="wrap_content"android:orientation="horizontal"app:layout_constraintGuide_percent="0.10259918"/><androidx.constraintlayout.widget.Guidelineandroid:id="@+id/guideline2"android:layout_width="wrap_content"android:layout_height="wrap_content"android:orientation="horizontal"app:layout_constraintGuide_percent="0.2"/><androidx.constraintlayout.widget.Guidelineandroid:id="@+id/guideline3"android:layout_width="wrap_content"android:layout_height="wrap_content"android:orientation="horizontal"app:layout_constraintGuide_percent="0.3"/><androidx.constraintlayout.widget.Guidelineandroid:id="@+id/guideline4"android:layout_width="wrap_content"android:layout_height="wrap_content"android:orientation="vertical"app:layout_constraintGuide_percent="0.3"/><TextViewandroid:id="@+id/textView"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/text_name"app:layout_constraintBottom_toTopOf="@+id/guideline"app:layout_constraintEnd_toStartOf="@+id/guideline4"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent"/><TextViewandroid:id="@+id/textView2"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/text_age"app:layout_constraintBottom_toTopOf="@+id/guideline2"app:layout_constraintEnd_toStartOf="@+id/guideline4"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="@+id/guideline"/><TextViewandroid:id="@+id/textView3"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/text_gender"app:layout_constraintBottom_toTopOf="@+id/guideline3"app:layout_constraintEnd_toStartOf="@+id/guideline4"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="@+id/guideline2"/><TextViewandroid:id="@+id/textView4"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@{user.name}"app:layout_constraintBottom_toTopOf="@+id/guideline"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="@+id/guideline4"app:layout_constraintTop_toTopOf="parent"/><TextViewandroid:id="@+id/textView6"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@{user.gender.toString()}"app:layout_constraintBottom_toTopOf="@+id/guideline3"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="@+id/guideline4"app:layout_constraintTop_toTopOf="@+id/guideline2"/><TextViewandroid:id="@+id/textView7"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@{String.valueOf(user.age)}"app:layout_constraintBottom_toTopOf="@+id/guideline2"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="@+id/guideline4"app:layout_constraintTop_toTopOf="@+id/guideline"/></androidx.constraintlayout.widget.ConstraintLayout></layout>MainActivity.kt的代码classMainActivity:AppCompatActivity(){overridefunonCreate(savedInstanceState:Bundle?){super.onCreate(savedInstanceState)//把布局交给DataBindingUtilvalactivityMainBinding:ActivityMainBinding=DataBindingUtil.setContentView(this,R.layout.activity_main)//设置数据activityMainBinding.user=User("TrillGates",30,Gender.MALE)}}运行结果由此，我们就完成了数据的绑定，我们没有给控件起id，里面的id是自动生成的，我们不用也行。这是不是跟vue.js里一样呀，绑定数据就可以了，非常简单。说明这里面我们布局最外层使用Layout标签进行包裹layout你可以手动写，或者按alt+回车提示你自动改data标签<data><variablename="user"type="com.sunofbeaches.databindingdemo.domain.User"/></data>这里面我们用于置顶bean类，也可以这样写：<data><importtype="com.sunofbeaches.databindingdemo.domain.User"/><variablename="user"type="User"/></data>ActivityMainBinding是自动生成的类，大家可以看看以下代码，对应着以上的布局代码//Generatedbydatabindingcompiler.Donotedit!packagecom.sunofbeaches.databindingdemo.databinding;importandroid.view.LayoutInflater;importandroid.view.View;importandroid.view.ViewGroup;importandroid.widget.TextView;importandroidx.annotation.NonNull;importandroidx.annotation.Nullable;importandroidx.constraintlayout.widget.Guideline;importandroidx.databinding.Bindable;importandroidx.databinding.DataBindingUtil;importandroidx.databinding.ViewDataBinding;importcom.sunofbeaches.databindingdemo.R;importcom.sunofbeaches.databindingdemo.domain.User;importjava.lang.Deprecated;importjava.lang.Object;publicabstractclassActivityMainBindingextendsViewDataBinding{@NonNullpublicfinalGuidelineguideline;@NonNullpublicfinalGuidelineguideline2;@NonNullpublicfinalGuidelineguideline3;@NonNullpublicfinalGuidelineguideline4;@NonNullpublicfinalTextViewtextView;@NonNullpublicfinalTextViewtextView2;@NonNullpublicfinalTextViewtextView3;@NonNullpublicfinalTextViewtextView4;@NonNullpublicfinalTextViewtextView6;@NonNullpublicfinalTextViewtextView7;@BindableprotectedUsermUser;protectedActivityMainBinding(Object_bindingComponent,View_root,int_localFieldCount,Guidelineguideline,Guidelineguideline2,Guidelineguideline3,Guidelineguideline4,TextViewtextView,TextViewtextView2,TextViewtextView3,TextViewtextView4,TextViewtextView6,TextViewtextView7){super(_bindingComponent,_root,_localFieldCount);this.guideline=guideline;this.guideline2=guideline2;this.guideline3=guideline3;this.guideline4=guideline4;this.textView=textView;this.textView2=textView2;this.textView3=textView3;this.textView4=textView4;this.textView6=textView6;this.textView7=textView7;}publicabstractvoidsetUser(@NullableUseruser);@NullablepublicUsergetUser(){returnmUser;}@NonNullpublicstaticActivityMainBindinginflate(@NonNullLayoutInflaterinflater,@NullableViewGrouproot,booleanattachToRoot){returninflate(inflater,root,attachToRoot,DataBindingUtil.getDefaultComponent());}/***ThismethodreceivesDataBindingComponentinstanceastypeObjectinsteadof*typeDataBindingComponenttoavoidcausingtoomanycompilationerrorsif*compilationfailsforanotherreason.*https://issuetracker.google.com/issues/116541301*@DeprecatedUseDataBindingUtil.inflate(inflater,R.layout.activity_main,root,attachToRoot,component)*/@NonNull@DeprecatedpublicstaticActivityMainBindinginflate(@NonNullLayoutInflaterinflater,@NullableViewGrouproot,booleanattachToRoot,@NullableObjectcomponent){returnViewDataBinding.<ActivityMainBinding>inflateInternal(inflater,R.layout.activity_main,root,attachToRoot,component);}@NonNullpublicstaticActivityMainBindinginflate(@NonNullLayoutInflaterinflater){returninflate(inflater,DataBindingUtil.getDefaultComponent());}/***ThismethodreceivesDataBindingComponentinstanceastypeObjectinsteadof*typeDataBindingComponenttoavoidcausingtoomanycompilationerrorsif*compilationfailsforanotherreason.*https://issuetracker.google.com/issues/116541301*@DeprecatedUseDataBindingUtil.inflate(inflater,R.layout.activity_main,null,false,component)*/@NonNull@DeprecatedpublicstaticActivityMainBindinginflate(@NonNullLayoutInflaterinflater,@NullableObjectcomponent){returnViewDataBinding.<ActivityMainBinding>inflateInternal(inflater,R.layout.activity_main,null,false,component);}publicstaticActivityMainBindingbind(@NonNullViewview){returnbind(view,DataBindingUtil.getDefaultComponent());}/***ThismethodreceivesDataBindingComponentinstanceastypeObjectinsteadof*typeDataBindingComponenttoavoidcausingtoomanycompilationerrorsif*compilationfailsforanotherreason.*https://issuetracker.google.com/issues/116541301*@DeprecatedUseDataBindingUtil.bind(view,component)*/@DeprecatedpublicstaticActivityMainBindingbind(@NonNullViewview,@NullableObjectcomponent){return(ActivityMainBinding)bind(component,view,R.layout.activity_main);}}

2020-11-16 12:12 · Databinding / android / 安卓开发 / MVVM / Jetpack

[问答] 如何实现功德+1木鱼的动态添加view

各位大佬们好！

试了下实现下图弹出多个textView的效果失败了。

我个人的理解是它的轨迹是横向和纵向平移动画；

它这种创建多个textView应该是用的 rootView.addview(textview = new Textview(getContext))；

我的代码如下：

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private static final String TAG = "MainActivity";
    private TextView textView;
    private ConstraintLayout mConstraintLayout;
    private Animation showtext;
    private ImageButton muyu;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.black_background);
        initView();
        initData();
        UtilsReadWrite.verifyStoragePermissions(this);//动态获取外部存储读取权限
    }


    private void initData() {
        showtext = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.show_text);//动画
        muyu = findViewById(R.id.muyu);
        muyu.setOnClickListener(this);
    }


    private void initView() {
        mConstraintLayout = findViewById(R.id.black_background);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.muyu:
                textView.startAnimation(showtext);
                textView.setText("测试一...");
                textView.setTextColor(Color.WHITE);
                mConstraintLayout.addView(textView = new TextView(getApplicationContext()));
                break;
        }
    }


}

//动画
<set xmlns:android="http://schemas.android.com/apk/res/android">


    <translate
        android:fromXDelta="20"
        android:toXDelta="500"
        android:fromYDelta="1000"
        android:toYDelta="0"
        android:duration="1000" />


    <translate
        android:fromXDelta="500"
        android:toXDelta="1200"
        android:fromYDelta="0"
        android:toYDelta="800"
        android:duration="1000" />

</set>

动画还没写好就随便写了个坐标但是持续点击木鱼时不会像上面一样创建多个textView 不太懂是为啥....有大佬知道么，我是刚接触动画相关的技术...查了下百度没找到合理的解决方案。

我的效果：

2023-01-09 17:27 · Android / 功德+1 / 动画 / 移动开发