Android Studio中新項目上的Android Material Design

Question

我已經使用Eclipse構建了一些Android應用，現在我開始使用Android Studio進行開發

我已遵循此構建材料設計應用程序教程

我使用導入功能在Android Studio上成功運行了本教程，並在設備中完美運行

所以，我重新安裝了最新的Android Studio，也下載了最新的SDK。

現在，我想在我的應用中實現它

我嘗試過的步驟

1. 建立新專案

2. 將教程中的所有活動復制到我的應用中

3. 將教程中的所有其余文件夾復制到我的應用中

4. 將教程中的Android清單中的應用程序設置復制到我的應用程序

5. 將教程中的build.gradle（模塊應用）復制到我的應用中

但是它顯示錯誤，然后我開始跟蹤問題所在，並發現了一些問題

    import android.os.Bundle;
    import android.support.design.widget.FloatingActionButton;
    import android.support.design.widget.NavigationView;
    import android.support.design.widget.Snackbar;
    import android.support.design.widget.TabLayout;
    import android.support.graphics.drawable.VectorDrawableCompat;
    import android.support.v4.app.Fragment;
    import android.support.v4.app.FragmentManager;
    import android.support.v4.app.FragmentPagerAdapter;
    import android.support.v4.content.res.ResourcesCompat;
    import android.support.v4.view.GravityCompat;
    import android.support.v4.view.ViewPager;
    import android.support.v4.widget.DrawerLayout;
    import android.support.v7.app.ActionBar;
    import android.support.v7.app.AppCompatActivity;
    import android.support.v7.widget.Toolbar;
    import android.view.Menu;
    import android.view.MenuItem;
    import android.view.View;

    import java.util.ArrayList;
    import java.util.List;


    /**
     * Provides UI for the main screen.
     */
    public class MainActivity extends AppCompatActivity {

        private DrawerLayout mDrawerLayout;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            // Adding Toolbar to Main screen
            Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
            setSupportActionBar(toolbar);
            // Setting ViewPager for each Tabs
            ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
            setupViewPager(viewPager);
            // Set Tabs inside Toolbar
            TabLayout tabs = (TabLayout) findViewById(R.id.tabs);
            tabs.setupWithViewPager(viewPager);


            // Create Navigation drawer and inlfate layout
            NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
            mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer);
            // Adding menu icon to Toolbar
            ActionBar supportActionBar = getSupportActionBar();

            if (supportActionBar != null) {

                // Start from this line, if I leave it uncommented, it will make the app crash

                //VectorDrawableCompat indicator
                //      = VectorDrawableCompat.create(getResources(), R.drawable.ic_menu, getTheme());
                //indicator.setTint(ResourcesCompat.getColor(getResources(),R.color.white,getTheme()));
                //supportActionBar.setHomeAsUpIndicator(indicator);
                //supportActionBar.setDisplayHomeAsUpEnabled(true);
            }



            // Set behavior of Navigation drawer
            navigationView.setNavigationItemSelectedListener(
                    new NavigationView.OnNavigationItemSelectedListener() {
                        // This method will trigger on item Click of navigation menu
                        @Override
                        public boolean onNavigationItemSelected(MenuItem menuItem) {
                            // Set item in checked state
                            menuItem.setChecked(true);

                            // TODO: handle navigation

                            // Closing drawer on item click
                            mDrawerLayout.closeDrawers();
                            return true;
                        }
                    });
            // Adding Floating Action Button to bottom right of main view
            FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
            fab.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Snackbar.make(v, "Hello Snackbar!",
                            Snackbar.LENGTH_LONG).show();
                }
            });             
        }


        // Add Fragments to Tabs
        private void setupViewPager(ViewPager viewPager) {
            Adapter adapter = new Adapter(getSupportFragmentManager());
            adapter.addFragment(new ListContentFragment(), "List");
            adapter.addFragment(new TileContentFragment(), "Tile");
            adapter.addFragment(new CardContentFragment(), "Card");
            viewPager.setAdapter(adapter);
        }

        static class Adapter extends FragmentPagerAdapter {
            private final List<Fragment> mFragmentList = new ArrayList<>();
            private final List<String> mFragmentTitleList = new ArrayList<>();

            public Adapter(FragmentManager manager) {
                super(manager);
            }

            @Override
            public Fragment getItem(int position) {
                return mFragmentList.get(position);
            }

            @Override
            public int getCount() {
                return mFragmentList.size();
            }

            public void addFragment(Fragment fragment, String title) {
                mFragmentList.add(fragment);
                mFragmentTitleList.add(title);
            }

            @Override
            public CharSequence getPageTitle(int position) {
                return mFragmentTitleList.get(position);
            }
        }

        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            // Inflate the menu; this adds items to the action bar if it is present.
            getMenuInflater().inflate(R.menu.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;
            } else if (id == android.R.id.home) {
                mDrawerLayout.openDrawer(GravityCompat.START);
            }
            return super.onOptionsItemSelected(item);
        }

    }

我已經在上面的源代碼中注釋了一些代碼，並且該應用在設備上運行良好

如果我激活該代碼，將顯示如下錯誤

    E/AndroidRuntime: FATAL EXCEPTION: main
  java.lang.RuntimeException: Unable to start activity ComponentInfo{package.name.MainActivity}: android.content.res.Resources$NotFoundException: File res/drawable-mdpi-v4/ic_menu.png from xml type xml resource ID #0x7f02005e

造成問題的代碼，從這里開始

    **//VectorDrawableCompat indicator
    //  = VectorDrawableCompat.create(getResources(), R.drawable.ic_menu, getTheme());**

如果我不加注釋，它將使應用程序崩潰

到目前為止，NavigationView，FloatingActionButton等效果良好

那么，VectorDrawableCompat有什么問題，以及如何解決呢？

之前感謝

Answer 1

安裝Android 5.0 SDK的SDK平台，然后通過SDK-Manager將支持庫和支持存儲庫更新為最新版本。

看看這個用於創建實質性應用程序的鏈接

http://developer.android.com/training/material/index.html

使用支持庫，您可以在較舊的設備上提供類似的行為，例如：

使用UI小部件（例如EditText Spinner RadioButton）的Material Theme子集還可以查看android設計支持庫。

更多信息：此處有更多庫

https://android-arsenal.com/

Answer 2

答案很簡單，問題是主題

    VectorDrawableCompat indicator = VectorDrawableCompat.create(getResources(), R.drawable.ic_menu, null);
    indicator.setTint(ResourcesCompat.getColor(getResources(),R.color.white, null));
    supportActionBar.setHomeAsUpIndicator(indicator);
    supportActionBar.setDisplayHomeAsUpEnabled(true);

我將主題設置為空值，現在可以正常工作了