如何顯示導航抽屜中的片段？

Question

我在查找使用Android Studio中此特定的AUTO生成代碼的問題時遇到問題。 我想弄清楚如何顯示從導航抽屜中單擊按鈕時的布局？

這是生成的MainActivity

    package com.oxinc.android.classaverage;

    import android.app.FragmentManager;
    import android.os.Bundle;
    import android.support.design.widget.FloatingActionButton;
    import android.support.design.widget.Snackbar;
    import android.view.View;
    import android.support.design.widget.NavigationView;
    import android.support.v4.view.GravityCompat;
    import android.support.v4.widget.DrawerLayout;
    import android.support.v7.app.ActionBarDrawerToggle;
    import android.support.v7.app.AppCompatActivity;
    import android.support.v7.widget.Toolbar;
    import android.view.Menu;
    import android.view.MenuItem;

    public class MainActivity extends AppCompatActivity
            implements NavigationView.OnNavigationItemSelectedListener {

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
            setSupportActionBar(toolbar);

            FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
            fab.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                            .setAction("Action", null).show();
                }
            });

            DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
            ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                    this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
            drawer.setDrawerListener(toggle);
            toggle.syncState();

            NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
            navigationView.setNavigationItemSelectedListener(this);
        }

        @Override
        public void onBackPressed() {
            DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
            if (drawer.isDrawerOpen(GravityCompat.START)) {
                drawer.closeDrawer(GravityCompat.START);
            } else {
                super.onBackPressed();
            }
        }

        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            // Inflate the menu; this adds items to the action bar if it is present.
            getMenuInflater().inflate(R.menu.main, menu);
            return true;
        }

        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            // Handle action bar item clicks here. The action bar will
            // automatically handle clicks on the Home/Up button, so long
            // as you specify a parent activity in AndroidManifest.xml.
            int id = item.getItemId();

            //noinspection SimplifiableIfStatement
            if (id == R.id.action_settings) {
                return true;
            }

            return super.onOptionsItemSelected(item);
        }

        @SuppressWarnings("StatementWithEmptyBody")
        @Override
        public boolean onNavigationItemSelected(MenuItem item) {
            // Handle navigation view item clicks here.
            int id = item.getItemId();

//This is the part I am having trouble with

            if (id == R.id.nav_camera) {
                // Handle the camera action
            } else if (id == R.id.nav_gallery) {

            } else if (id == R.id.nav_slideshow) {


            } else if (id == R.id.nav_manage) {

            } else if (id == R.id.nav_share) {

            } else if (id == R.id.nav_send) {
                //This is what I have come up with
                setContentView(R.layout.MyLayout)
            }

            DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
            drawer.closeDrawer(GravityCompat.START);
            return true;
        }
    }

先感謝您。

Answer 1

要顯示至少要更新的片段，請執行下一步。讓您的Android Studio默認類繼承FragmentActivity，對其進行相應更改，或者您可以跳過此步驟。在實際放置內容的根視圖內放置一個FrameLayout（android studio默認情況下是使用抽屜為您創建的）並必須獲取該FrameLayout的實例。創建一個類，例如說MyFragmenNumberOne.class並讓其繼承FRAGMENT，並確保將v4用作對較舊版本的目標支持。將會從fragmentManager調用模式代碼以添加/刪除/替換片段，您將在其中傳遞片段類和容器框架布局實例。重要的是，在調用beginTransaction.replace（）時，第一個參數不會顯示您的容器，但是它的資源ID（例如R.id.myContainer），第二個參數是fragment的實例，可以使用new關鍵字直接對其進行初始化，也可以使用靜態的newInst 片段類內部的ance（）方法將創建一次實例，並在應用程序li​​frcycle中使用它，這是更好的實踐。希望我能為您提供幫助。