Android开发丶使用DialogFragment完成炫酷的弹窗登录界面并完成DialogFragment与宿主Fragment的通信

在上篇文档中，我主要记录了通过接口回调实现了DialogFragment与宿主Acitivity的通信，但是在实际开发过程中，登录界面往往是从“我的”这个Fragment打开的，这里发现接口回调不是很好用，查阅了很多文档，都没有很好的解决办法，因此，怎样把输入的账户名和密码由DialogFragment传递给宿主Fragment以便完成进一步的网络请求等操作就成了我们亟待解决的问题，这里我们通过setTartgetFragment()这个方法即可解决。

这里因为界面等基本与上篇与Activity交互的文档相同，所以不再详细赘述，可以参考如下文档。

http://blog.csdn.net/u014078990/article/details/79286850

首先看下实际效果。

实现步骤：

1.在DialogFragment这个方法里，在登录按钮的onClick点击事件里设置监听。

@Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.login_btn:
                if (getTargetFragment()== null){
                    return;
                }
                Intent intent= new Intent();
                intent.putExtra(USERNAME, mUsername.getText().toString());
                intent.putExtra(USERPASSWORD, mPassword.getText().toString());
                getTargetFragment().onActivityResult(MainFragment.REQUEST_CODE, Activity.RESULT_OK, intent);
                break;
        }
    }

完整代码：

package com.fantasychong.dialogfragmentlogin2;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;

/**
 * Created by lenovo on 2018/2/8.
 */

public class LoginDailogFragment extends DialogFragment implements View.OnClickListener {

    public static final String USERNAME = "userName";
    public static final String USERPASSWORD = "userPassword";
    private EditText mUsername;
    private EditText mPassword;
    private Button btn;
    private ImageView iv;
    private TextView toReg;
    private ProgressBar pb;
    private LoginDailogFragment fragment;


    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        //设置背景透明
        getDialog().getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
        return super.onCreateView(inflater, container, savedInstanceState);
    }

    @NonNull
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        View view= LayoutInflater.from(getActivity()).inflate(R.layout.dialog_login, null);
        iv= view.findViewById(R.id.login_iv);
        toReg= view.findViewById(R.id.login_register);
        mUsername= view.findViewById(R.id.login_et1);
        btn= view.findViewById(R.id.login_btn);
        mPassword= view.findViewById(R.id.login_et2);
        iv.setOnClickListener(this);
        toReg.setOnClickListener(this);
        btn.setOnClickListener(this);

        builder.setView(view);
        return builder.create();
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.login_btn:
                if (getTargetFragment()== null){
                    return;
                }
                Intent intent= new Intent();
                intent.putExtra(USERNAME, mUsername.getText().toString());
                intent.putExtra(USERPASSWORD, mPassword.getText().toString());
                getTargetFragment().onActivityResult(MainFragment.REQUEST_CODE, Activity.RESULT_OK, intent);
                break;
        }
    }
}

2.在宿主Fragment里设置onActivityResult方法设置回调的参数。

 @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode== REQUEST_CODE){
            String userName= data.getStringExtra(LoginDailogFragment.USERNAME);
            String userPassword= data.getStringExtra(LoginDailogFragment.USERPASSWORD);
            name.setText(userName);
            password.setText(userPassword);
            fragment.dismiss();
        }
    }

3.在宿主Fragment打开DialogFragment的入口处设置监听。

login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                fragment= new LoginDailogFragment();
                fragment.setTargetFragment(MainFragment.this, REQUEST_CODE);
                fragment.show(getFragmentManager(), "login");
            }
        });

完整代码：

package com.fantasychong.dialogfragmentlogin2;

import android.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

public class MainFragment extends Fragment {

    public static final int REQUEST_CODE = 1;

    private Button login;
    private TextView name;
    private TextView password;
    private LoginDailogFragment fragment;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view= LayoutInflater.from(getActivity()).inflate(R.layout.fragment_main, container, false);
        login= view.findViewById(R.id.main_login);
        name= view.findViewById(R.id.main_name);
        password= view.findViewById(R.id.main_password);

        login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                fragment= new LoginDailogFragment();
                fragment.setTargetFragment(MainFragment.this, REQUEST_CODE);
                fragment.show(getFragmentManager(), "login");
            }
        });
        return view;
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode== REQUEST_CODE){
            String userName= data.getStringExtra(LoginDailogFragment.USERNAME);
            String userPassword= data.getStringExtra(LoginDailogFragment.USERPASSWORD);
            name.setText(userName);
            password.setText(userPassword);
            fragment.dismiss();
        }
    }
}

至此全部完成，我们可以看到无论是宿主Activity还是宿主Fragment都可以接收到DialogFragment回调过来的参数，我们根据实际开发需求去选取即可。

源码下载：点击打开链接