android-support-v7-appcompat 和 android-support-v4 之间的区别

android-support-v7-appcompat 和 android-support-v4 的区别

java
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;
import android.support.design.widget.NavigationView;
public class MainActivity extends AppCompatActivity {
    private Toolbar toolbar;
    private ViewPager viewPager;
    private DrawerLayout drawerLayout;
    private NavigationView navigationView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // 初始化 Toolbar
        toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        // 初始化 ViewPager
        viewPager = findViewById(R.id.viewPager);
        MyPagerAdapter adapter = new MyPagerAdapter(getSupportFragmentManager());
        viewPager.setAdapter(adapter);
        // 初始化 DrawerLayout 和 NavigationView
        drawerLayout = findViewById(R.id.drawerLayout);
        navigationView = findViewById(R.id.navigationView);
        navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(MenuItem item) {
                // 处理导航菜单项的点击事件
                return true;
            }
        });
    }
}