Android使用Navigation的小例子

郑州app开发使用Navigation的小例子，也正是通过用Navigation来进行ViewModel的操作。下面是java代码：

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MainActivity.java

package cn.xhhkj.cao;

import androidx.appcompat.app.AppCompatActivity;

import androidx.databinding.DatabindingUtil;

import androidx.lifecycle.ViewModelproviders;

import android.os.bundle;

public class MainActivity extends AppCompatActivity {

@Override

protected void onCreate(bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

}

可以看出，基本没有变化。

MyViewModel.java

package cn.xhhkj.cao;

import androidx.lifecycle.MutableLiveData;

import androidx.lifecycle.ViewModel;

public class MyViewModel extends ViewModel {

private MutableLiveData<Integer> number;

public MutableLiveData<Integer>getNumber(){

if (number == null){

number = new MutableLiveData<>();

number.setValue(0);

}

return number;

}

public void add(int x){

number.setValue(number.getValue()+x);

if (number.getValue()<0){

number.setValue(0);

}

这里就能看出，数据处理都在这里了。

MasterFragment.java

package cn.xhhkj.cao;

import android.os.bundle;

import androidx.databinding.DatabindingUtil;

import androidx.fragment.app.Fragment;

import androidx.lifecycle.ViewModelprovider;

import androidx.lifecycle.ViewModelproviders;

import androidx.navigation.NavController;

import androidx.navigation.Navigation;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.Seekbar;

import cn.xhhkj.cao.databinding.FragmentMasterbinding;

/**

* A simple {@link Fragment} subclass.

public class MasterFragment extends Fragment {

public MasterFragment() {

// Required empty public constructor

}

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

bundle savedInstanceState) {

final MyViewModel myViewModel;

myViewModel= ViewModelproviders.of(getActivity()).get(MyViewModel.class);

FragmentMasterbinding binding;

binding= DatabindingUtil.inflate(inflater,R.layout.fragment_master,container,false);

binding.setData(myViewModel);

binding.setLifecycleOwner(getActivity());

binding.button.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

NavController controller= Navigation.findNavController(v);

controller.navigate(R.id.action_masterFragment_to_detailFragment);

}

});

// binding.seekbar.setprogress(myViewModel.getNumber().getValue());

binding.seekbar.setOnSeekbarChangeListener(new Seekbar.OnSeekbarChangeListener() {

@Override

public void onprogressChanged(Seekbar seekbar, int progress, boolean fromUser) {

myViewModel.getNumber().setValue(progress);

}

@Override

public void onStartTrackingTouch(Seekbar seekbar) {

}

@Override

public void onStopTrackingTouch(Seekbar seekbar) {

}

});

return binding.getRoot();

}

DetailFragment.java

package cn.xhhkj.cao;

import android.os.bundle;

import androidx.databinding.DatabindingUtil;

import androidx.fragment.app.Fragment;

import androidx.lifecycle.ViewModelprovider;

import androidx.lifecycle.ViewModelproviders;

import androidx.navigation.NavController;

import androidx.navigation.Navigation;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import cn.xhhkj.cao.databinding.FragmentDetailbinding;

/**

* A simple {@link Fragment} subclass.

public class DetailFragment extends Fragment {

public DetailFragment() {

// Required empty public constructor

}

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

bundle savedInstanceState) {

MyViewModel myViewModel;

myViewModel= ViewModelproviders.of(getActivity()).get(MyViewModel.class);

FragmentDetailbinding binding;

binding= DatabindingUtil.inflate(inflater,R.layout.fragment_detail,container,false);

binding.setData(myViewModel);

binding.setLifecycleOwner(getActivity());

binding.button4.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

NavController controller= Navigation.findNavController(v);

controller.navigate(R.id.action_detailFragment_to_masterFragment);

}

});

return binding.getRoot();

// Inflate the layout for this fragment

//return inflater.inflate(R.layout.fragment_detail, container, false);

}

下面是布局代码

activity_main.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"

android:orientation="vertical" android:layout_width="match_parent"

android:layout_height="match_parent"}

{fragment

android:id="@+id/fragment2"

android:name="androidx.navigation.fragment.NavHostFragment"

android:layout_width="match_parent"

android:layout_height="match_parent"

app:defaultNavHost="true"

app:navGraph="@navigation/nav" /}

{/androidx.constraintlayout.widget.ConstraintLayout}

fragment_master.xml

{?xml version="1.0" encoding="utf-8"?}

{layout 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"}

{data}

{variable

name="data"

type="cn.xhhkj.cao.MyViewModel" /}

{/data}

{androidx.constraintlayout.widget.ConstraintLayout

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MasterFragment"}

{TextView

android:id="@+id/textView"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:maxLength="10"

android:text="@{String.valueOf(data.number)}"

android:textSize="30sp"

app:layout_constraintbottom_tobottomOf="parent"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintHorizontal_bias="0.538"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toTopOf="parent"

app:layout_constraintVertical_bias="0.255" /}

{Seekbar

android:id="@+id/seekbar"

android:layout_width="0dp"

android:layout_height="wrap_content"

android:max="30"

app:layout_constraintbottom_tobottomOf="parent"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintHorizontal_bias="0.0"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toTopOf="parent"

app:layout_constraintVertical_bias="0.431" /}

{button

android:id="@+id/button"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginStart="132dp"

android:text="进入"

app:layout_constraintbottom_tobottomOf="parent"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintHorizontal_bias="0.219"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toTopOf="parent"

app:layout_constraintVertical_bias="0.579" /}

{/androidx.constraintlayout.widget.ConstraintLayout}

{/layout}

fragment_detail.xml

{?xml version="1.0" encoding="utf-8"?}

{layout 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"}

{data}

{variable

name="data"

type="cn.xhhkj.cao.MyViewModel" /}

{/data}

{androidx.constraintlayout.widget.ConstraintLayout

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".DetailFragment"}

{TextView

android:id="@+id/textView2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@{String.valueOf(data.number)}"

android:textSize="30sp"

app:layout_constraintbottom_tobottomOf="parent"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toTopOf="parent"

app:layout_constraintVertical_bias="0.21" /}

{button

android:id="@+id/button2"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="+"

android:textSize="30sp"

android:onClick="@{()-}data.add(+1)}"

app:layout_constraintbottom_tobottomOf="parent"

app:layout_constraintEnd_toStartOf="@+id/button3"

app:layout_constraintHorizontal_bias="0.5"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toTopOf="parent"

app:layout_constraintVertical_bias="0.43" /}

{button

android:id="@+id/button3"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="-"

android:textSize="30sp"

android:onClick="@{()-}data.add(-1)}"

app:layout_constraintbottom_tobottomOf="@+id/button2"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintHorizontal_bias="0.5"

app:layout_constraintStart_toEndOf="@+id/button2"

app:layout_constraintTop_toTopOf="@+id/button2"

app:layout_constraintVertical_bias="0.0" /}

{button

android:id="@+id/button4"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="返回"

app:layout_constraintbottom_tobottomOf="parent"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintHorizontal_bias="0.513"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toTopOf="parent"

app:layout_constraintVertical_bias="0.67" /}

{/androidx.constraintlayout.widget.ConstraintLayout}

{/layout}

以上就是全部代码了。

补充下，需要在gradle scripts这个文件夹里面build.gradle(module:app)这个文件里面添加这行代码

databinding {

enabled true

}

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