#4 #542 第四次实验

students/soft1714080902420/app/src/main/AndroidManifest.xml

@@ -9,9 +9,9 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
-        <activity android:name=".Soft1714080902420SearceActivity"></activity>
-        <activity android:name=".Soft1714080902420SourceActivity" />
-        <activity android:name=".Soft1714080902420Activity">
+        <activity
+            android:name=".Soft1714080902420Activity"
+            android:label="@string/app_name">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 

students/soft1714080902420/app/src/main/java/edu/hzuapps/androidlabs/soft1714080902420/Soft1714080902420Activity.java

@@ -1,38 +1,96 @@
 package edu.hzuapps.androidlabs.soft1714080902420;
 
-import android.app.Activity;
-import android.content.Intent;
-import android.support.v7.app.AppCompatActivity;
+
 import android.os.Bundle;
-import android.view.View;
-import android.widget.Button;
+import android.support.annotation.NonNull;
+import android.support.design.widget.BottomNavigationView;
+import android.support.v4.app.Fragment;
+import android.support.v4.app.FragmentTransaction;
+import android.support.v7.app.AppCompatActivity;
+import android.view.MenuItem;
 
 public class Soft1714080902420Activity extends AppCompatActivity {
+    private BottomNavigationView bottomNavigationView;
+    private searceFragment fragment1;
+    private sourceFragment fragment2;
+    private newsFragment fragment3;
+    private Fragment[] fragments;
+    private int lastfragment;//用于记录上个选择的Fragment
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.soft_1714080902420_activity);
-        Button bt1 = (Button) findViewById(R.id.button1);
-        Button bt2=(Button)findViewById(R.id.button2);
-        bt1.setOnClickListener(listener);
-        bt2.setOnClickListener(listener2);
+        initFragment();
+    }
+
+    //初始化fragment和fragment数组
+    private void initFragment() {
+
+        fragment1 = new searceFragment();
+        fragment2 = new sourceFragment();
+        fragment3 = new newsFragment();
+        fragments = new Fragment[]{fragment1, fragment2, fragment3};
+        lastfragment = 0;
+        getSupportFragmentManager().beginTransaction().replace(R.id.container, fragment1).show(fragment1).commit();
+        bottomNavigationView = (BottomNavigationView) findViewById(R.id.navigation);
+
+        bottomNavigationView.setOnNavigationItemSelectedListener(changeFragment);
     }
 
-    Button.OnClickListener listener = new Button.OnClickListener() {
-        public void onClick(View v) {
-            Intent intent = new Intent(Soft1714080902420Activity.this, Soft1714080902420SourceActivity.class);
-            startActivity(intent);
-            Soft1714080902420Activity.this.finish();
+    //判断选择的菜单
+    private BottomNavigationView.OnNavigationItemSelectedListener changeFragment = new BottomNavigationView.OnNavigationItemSelectedListener() {
+        @Override
+        public boolean onNavigationItemSelected(@NonNull MenuItem item) {
+
+            switch (item.getItemId()) {
+                case R.id.navigation_home: {
+                    if (lastfragment != 0) {
+                        switchFragment(lastfragment, 0);
+                        lastfragment = 0;
+
+                    }
+
+                    return true;
+                }
+                case R.id.navigation_dashboard: {
+                    if (lastfragment != 1) {
+                        switchFragment(lastfragment, 1);
+                        lastfragment = 1;
+
+                    }
+
+                    return true;
+                }
+                case R.id.navigation_notifications: {
+                    if (lastfragment != 2) {
+                        switchFragment(lastfragment, 2);
+                        lastfragment = 2;
+
+                    }
+
+                    return true;
+                }
+
+
+            }
+
+
+            return false;
         }
     };
-    Button.OnClickListener listener2 = new Button.OnClickListener() {
-        public void onClick(View v) {
-            Intent intent = new Intent(Soft1714080902420Activity.this, Soft1714080902420SearceActivity.class);
-            startActivity(intent);
-            Soft1714080902420Activity.this.finish();
+
+    //切换Fragment
+    private void switchFragment(int lastfragment, int index) {
+        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
+        transaction.hide(fragments[lastfragment]);//隐藏上个Fragment
+        if (fragments[index].isAdded() == false) {
+            transaction.add(R.id.container, fragments[index]);
+
+
         }
-    };
+        transaction.show(fragments[index]).commitAllowingStateLoss();
 
 
-}
+    }
+}

students/soft1714080902420/app/src/main/java/edu/hzuapps/androidlabs/soft1714080902420/newsFragment.java

@@ -0,0 +1,21 @@
+package edu.hzuapps.androidlabs.soft1714080902420;
+
+import android.content.Context;
+import android.net.Uri;
+import android.os.Bundle;
+import android.support.v4.app.Fragment;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+
+public class newsFragment extends Fragment {
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        // Inflate the layout for this fragment
+        return inflater.inflate(R.layout.fragment_news, container, false);
+    }
+
+}

students/soft1714080902420/app/src/main/java/edu/hzuapps/androidlabs/soft1714080902420/searceFragment.java

@@ -0,0 +1,21 @@
+package edu.hzuapps.androidlabs.soft1714080902420;
+
+import android.content.Context;
+import android.net.Uri;
+import android.os.Bundle;
+import android.support.v4.app.Fragment;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+
+public class searceFragment extends Fragment {
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        // Inflate the layout for this fragment
+        return inflater.inflate(R.layout.fragment_searce, container, false);
+    }
+
+}

students/soft1714080902420/app/src/main/java/edu/hzuapps/androidlabs/soft1714080902420/sourceFragment.java

@@ -0,0 +1,21 @@
+package edu.hzuapps.androidlabs.soft1714080902420;
+
+import android.content.Context;
+import android.net.Uri;
+import android.os.Bundle;
+import android.support.v4.app.Fragment;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+
+public class sourceFragment extends Fragment {
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        // Inflate the layout for this fragment
+        return inflater.inflate(R.layout.fragment_source, container, false);
+    }
+
+}