java - 关于 ImageButtons 滞后且不合适的 2 个问题

Question

因此，我制作了一个 fragment 的 XML 文件，其中包含以下内容:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <ImageButton
        android:layout_width="match_parent"
        android:layout_height="110dp"
        app:srcCompat="@drawable/flourbutton"
        android:id="@+id/imageButton"
        android:background="@android:color/transparent"
        android:scaleType="fitXY"
        style="?attr/borderlessButtonStyle"/>
        <ImageButton
        android:layout_width="match_parent"
        android:layout_height="110dp"
        app:srcCompat="@drawable/sugara"
        android:id="@+id/flour"
        android:background="@android:color/transparent"
        android:scaleType="fitXY"
        style="?attr/borderlessButtonStyle"/>
</LinearLayout>

问题是:

1. 我的应用程序中有抽屉导航，这使得它非常滞后...可能是图片...我能做什么？

2. 现在，按钮周围有白色边框，但按钮之间没有白色边框 如下图所示: buttons problem 我怎样才能让它们适应整个布局的宽度和高度？

谢谢大家!!

Java代码:

package com.example.matancohen.sg50;

import android.content.Intent;
import android.graphics.Camera;
import android.os.Bundle;
import android.os.Handler;
import android.os.MessageQueue;
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.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.app.FragmentManager;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.Toast;



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);

    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.addDrawerListener(toggle);
    toggle.syncState();

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

    displayView(R.id.nav_home);


}

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


private void displayView(int itemId) {
    Fragment fragment = null;

    switch (itemId) {
        case R.id.nav_home:
            fragment = new Article();
            break;
        case R.id.nav_Recipes:
            fragment = new Recipes();
            break;

    }
    if (fragment != null) {
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        ft.replace(R.id.content_main, fragment);
        ft.commit();
    }
            DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
            drawer.closeDrawer(GravityCompat.START);

}

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {

    displayView(item.getItemId());
    return true;
}

}

Answer 1

首先不要在每个项目选择上初始化DrawerLayout。在 onCreate 中执行一次，然后像 drawer.closeDrawers(); 一样使用它。

其次，我在您的 fragment 中没有看到任何巨大的数据，但是对于拥有大量数据的 fragment ，您可以使用 Runnable 替换 fragment 。那么 fragment 加载了淡入淡出效果，下面是如何实现的。

private void displayView(int itemId) {
    Fragment fragment = null;

    switch (itemId) {
        case R.id.nav_home:
            fragment = new Article();
            break;
        case R.id.nav_Recipes:
            fragment = new Recipes();
            break;

    }

    if(fragment != null) {
            Runnable mPendingRunnable = new Runnable() {
                @Override
                public void run() {
                    FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
                    fragmentTransaction.setCustomAnimations(android.R.anim.fade_in,
                            android.R.anim.fade_out);
                    fragmentTransaction.replace(R.id.frame, fragment);
                    fragmentTransaction.commitAllowingStateLoss();
                }
            };
            mHandler.post(mPendingRunnable);
            drawer.closeDrawers();
        }
}