团队项目——和谐共生(4)

今天对我做的界面进行了完善,由于我的个人习惯问题,只是在样例项目中进行了完成,自己的项目还没有进行完善,先来看一下完善前后的对比

 

 完善之后最主要的区别是内容能够在主界面进行显示,不在只显示文本内容。

之前自己使用的是viewPager+fragmenBlank+适配器,这次只使用了Fragment+事务

核心代码

import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.viewpager2.widget.ViewPager2;

import android.annotation.SuppressLint;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

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

public class MainActivity extends FragmentActivity implements View.OnClickListener {

    private WeixinFragment firstFragment = null;// 用于显示微信界面
    private ContactListFragment secondFragment = null;// 用于显示通讯录界面
    private FindFragment thirdFragment = null;// 用于显示发现界面
    private SelfFragment fourthFragment = null;// 用于显示我界面

    private View firstLayout = null;// 微信显示布局
    private View secondLayout = null;// 通讯录显示布局
    private View thirdLayout = null;// 发现显示布局
    private View fourthLayout = null;// 我显示布局

    /*声明组件变量*/
    private ImageView weixinImg = null;
    private ImageView contactImg = null;
    private ImageView findImg = null;
    private ImageView selfImg = null;

    private TextView weixinText = null;
    private TextView contactText = null;
    private TextView  findText = null;
    private TextView selfText = null;
    private FragmentManager fragmentManager = null;// 用于对Fragment进行管理
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);// 初始化布局元素
        initViews();
        fragmentManager = getFragmentManager();//用于对Fragment进行管理
        // 设置默认的显示界面
        setTabSelection(0);
    }

    /**
     * 在这里面获取到每个需要用到的控件的实例,并给它们设置好必要的点击事件
     */
    @SuppressLint("NewApi")
    public void initViews() {
        fragmentManager = getFragmentManager();
        firstLayout = findViewById(R.id.weixin_layout);
        secondLayout = findViewById(R.id.contacts_layout);
        thirdLayout = findViewById(R.id.find_layout);
        fourthLayout = findViewById(R.id.self_layout);

        weixinImg = (ImageView) findViewById(R.id.weixin_img);
        contactImg = (ImageView) findViewById(R.id.contact_img);
        findImg = (ImageView) findViewById(R.id.find_img);
        selfImg = (ImageView) findViewById(R.id.self_img);

        weixinText = (TextView) findViewById(R.id.weixin_text);
        contactText = (TextView) findViewById(R.id.contact_text);
        findText = (TextView) findViewById(R.id.find_text);
        selfText = (TextView) findViewById(R.id.self_text);

        //处理点击事件
        firstLayout.setOnClickListener(this);
        secondLayout.setOnClickListener(this);
        thirdLayout.setOnClickListener(this);
        fourthLayout.setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {
//        changeTab(view.getId());
        switch (v.getId()) {
            case R.id.weixin_layout:
                setTabSelection(0);// 当点击了微信时,选中第1个tab
                break;
            case R.id.contacts_layout:
                setTabSelection(1);// 当点击了通讯录时,选中第2个tab
                break;
            case R.id.find_layout:
                setTabSelection(2);// 当点击了发现时,选中第3个tab
                break;
            case R.id.self_layout:
                setTabSelection(3);// 当点击了我时,选中第4个tab
                break;
            default:
                break;
        }
    }


    /**
     * 根据传入的index参数来设置选中的tab页 每个tab页对应的下标。0表示微信,1表示通讯录,2表示发现,3表示我
     */
    @SuppressLint("NewApi")
    private void setTabSelection(int index) {
        clearSelection();// 每次选中之前先清除掉上次的选中状态
        FragmentTransaction transaction = fragmentManager.beginTransaction();// 开启一个Fragment事务
        hideFragments(transaction);// 先隐藏掉所有的Fragment,以防止有多个Fragment显示在界面上的情况
        switch (index) {
            case 0:
                // 当点击了我的微信tab时改变控件的图片和文字颜色
                weixinImg.setImageResource(R.drawable.tab_weixin);//修改布局中的图片
                weixinText.setTextColor(Color.parseColor("#0090ff"));//修改字体颜色

                if (firstFragment == null) {
                    /*获取登录activity传过来的微信号*/
                    Intent intent = getIntent();
                    String number = intent.getStringExtra("weixin_number");
                    // 如果FirstFragment为空,则创建一个并添加到界面上
                    firstFragment = new WeixinFragment(number);
                    transaction.add(R.id.fragment, firstFragment);

                } else {
                    // 如果FirstFragment不为空,则直接将它显示出来
                    transaction.show(firstFragment);//显示的动作
                }
                break;
            // 以下和firstFragment类同
            case 1:
                contactImg.setImageResource(R.drawable.tab_contact);
                contactText.setTextColor(Color.parseColor("#0090ff"));
                if (secondFragment == null) {
                    /*获取登录activity传过来的微信号*/
                    Intent intent = getIntent();
                    String number = intent.getStringExtra("weixin_number");
                    secondFragment = new ContactListFragment(number);
                    transaction.add(R.id.fragment, secondFragment);
                } else {
                    transaction.show(secondFragment);
                }
                break;
            case 2:
                findImg.setImageResource(R.drawable.tab_find);
                findText.setTextColor(Color.parseColor("#0090ff"));
                if (thirdFragment == null) {
                    thirdFragment = new FindFragment();
                    transaction.add(R.id.fragment, thirdFragment);
                } else {
                    transaction.show(thirdFragment);
                }
                break;
            case 3:
                selfImg.setImageResource(R.drawable.tab_me);
                selfText.setTextColor(Color.parseColor("#0090ff"));
                if (fourthFragment == null) {
                    fourthFragment = new SelfFragment();
                    transaction.add(R.id.fragment, fourthFragment);
                } else {
                    transaction.show(fourthFragment);
                }
                break;
        }
        transaction.commit();

    }

    /**
     * 清除掉所有的选中状态
     */
    private void clearSelection() {
        weixinImg.setImageResource(R.drawable.tab_weixin);
        weixinText.setTextColor(Color.parseColor("#82858b"));

        contactImg.setImageResource(R.drawable.tab_contact);
        contactText.setTextColor(Color.parseColor("#82858b"));

        findImg.setImageResource(R.drawable.tab_find);
        findText.setTextColor(Color.parseColor("#82858b"));

        selfImg.setImageResource(R.drawable.tab_me);
        selfText.setTextColor(Color.parseColor("#82858b"));
    }

    /**
     * 将所有的Fragment都设置为隐藏状态 用于对Fragment执行操作的事务
     */
    @SuppressLint("NewApi")
    private void hideFragments(FragmentTransaction transaction) {
        if (firstFragment != null) {
            transaction.hide(firstFragment);
        }
        if (secondFragment != null) {
            transaction.hide(secondFragment);
        }
        if (thirdFragment != null) {
            transaction.hide(thirdFragment);
        }
        if (fourthFragment != null) {
            transaction.hide(fourthFragment);
        }
    }

    //封装一个AlertDialog
    private void exitDialog() {
        Dialog dialog = new AlertDialog.Builder(this)
                .setTitle("温馨提示")
                .setMessage("您确定要退出程序吗?")
                .setPositiveButton("关闭微信", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface arg0, int arg1) {
                        finish();
                    }
                })
                .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface arg0, int arg1) {
                    }
                }).create();
        dialog.show();//显示对话框
    }

    /**
     * 返回菜单键监听事件
     */
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {//如果是返回按钮
            exitDialog();
        }
        return super.onKeyDown(keyCode, event);
    }
}

 

 参考内容

posted on 2022-04-29 22:29  跨越&尘世  阅读(23)  评论(0编辑  收藏  举报