DialogFragment的传值问题

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继 DialogFragment的简单使用 之后，我们来聊聊 DialogFragment的传值问题。

效果展示：

Activity 向 DialogFragment 传值

方法一：使用 newInstance() + Bundle + setArguments()

第一步：完善 MyDialogFragment 代码

package com.wust.mydialog;


import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.DialogFragment;

import org.w3c.dom.Text;

/**
 * ClassName: MyDialogFragment <br/>
 * Description: <br/>
 * date: 2021/7/12 15:47<br/>
 *
 * @author yiqi<br />
 * @QQ 1820762465
 */
public class MyDialogFragment extends DialogFragment {
    private View mRootView;
    private Button btn_close;
    private stateListener mStateListener;
    private String mStr;
    private TextView tv_title;

    //这个是 Activity 向 DialogFragment 传值的关键代码段
    public static MyDialogFragment newInstance(String str) {
        MyDialogFragment myDialogFragment = new MyDialogFragment();
        Bundle bundle = new Bundle();
        bundle.putString("title",str);
        myDialogFragment.setArguments(bundle);
        return myDialogFragment;
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //设置样式
        setStyle(DialogFragment.STYLE_NORMAL, R.style.BottomDialog);
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        if (mRootView == null){
            //获取布局
            mRootView = getLayoutInflater().inflate(R.layout.dialog_fragment,container,false);
        }

        btn_close = mRootView.findViewById(R.id.btn_close);
        btn_close.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //调用回调
                mStateListener.close();
            }
        });

        tv_title = mRootView.findViewById(R.id.tv_title);
        //设置传过来的值
        Bundle arguments = this.getArguments();
        tv_title.setText(arguments.getString("title"));

        return mRootView;
    }

    @Override
    public void onStart() {
        //以下代码必须在 onStart() 方法中才有效
        Window window = getDialog().getWindow();
        WindowManager.LayoutParams params = window.getAttributes();
        params.gravity = Gravity.BOTTOM;
        params.width = WindowManager.LayoutParams.MATCH_PARENT;
        params.height = 500;
        window.setAttributes(params);
        super.onStart();
    }

    //创建回调，监听dialog的关闭
    public interface stateListener{
        void close();
    }
    //暴露接口
    public void setStateListener(stateListener listener){
        this.mStateListener = listener;
    }
}

第二步：在Activity中传值

package com.wust.mydialog;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import org.w3c.dom.Text;

public class MainActivity extends AppCompatActivity {

    private TextView tv_text;
    private EditText et_text;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv_text = findViewById(R.id.tv_text);
        et_text = findViewById(R.id.et_text);
    }

    public void showDialog(View v){
        //这句代码是传值关键
        final MyDialogFragment myDialogFragment = MyDialogFragment.newInstance(et_text.getText().toString());
        myDialogFragment.show(getSupportFragmentManager(),"123456");
        myDialogFragment.setStateListener(new MyDialogFragment.stateListener() {
            @Override
            public void close() {
                myDialogFragment.dismiss();
            }
        });
    }
}

方法二：使用 构造方法 传值

第一步：完善 MyDialogFragment 代码

package com.wust.mydialog;


import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.DialogFragment;

import org.w3c.dom.Text;

/**
 * ClassName: MyDialogFragment <br/>
 * Description: <br/>
 * date: 2021/7/12 15:47<br/>
 *
 * @author yiqi<br />
 * @QQ 1820762465
 */
public class MyDialogFragment extends DialogFragment {
    private View mRootView;
    private Button btn_close;
    private stateListener mStateListener;
    private String mStr;
    private TextView tv_title;

    //这个是 Activity 向 DialogFragment 传值的关键代码段
    public MyDialogFragment(String str) {
        this.mStr = str;
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //设置样式
        setStyle(DialogFragment.STYLE_NORMAL, R.style.BottomDialog);
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        if (mRootView == null){
            //获取布局
            mRootView = getLayoutInflater().inflate(R.layout.dialog_fragment,container,false);
        }

        btn_close = mRootView.findViewById(R.id.btn_close);
        btn_close.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //调用回调
                mStateListener.close();
            }
        });

        tv_title = mRootView.findViewById(R.id.tv_title);
        tv_title.setText(mStr);

        return mRootView;
    }

    @Override
    public void onStart() {
        //以下代码必须在 onStart() 方法中才有效
        Window window = getDialog().getWindow();
        WindowManager.LayoutParams params = window.getAttributes();
        params.gravity = Gravity.BOTTOM;
        params.width = WindowManager.LayoutParams.MATCH_PARENT;
        params.height = 500;
        window.setAttributes(params);
        super.onStart();
    }

    //创建回调，监听dialog的关闭
    public interface stateListener{
        void close();
    }
    //暴露接口
    public void setStateListener(stateListener listener){
        this.mStateListener = listener;
    }
}

第二步：在Activity中传值

package com.wust.mydialog;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import org.w3c.dom.Text;

public class MainActivity extends AppCompatActivity {

    private TextView tv_text;
    private EditText et_text;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv_text = findViewById(R.id.tv_text);
        et_text = findViewById(R.id.et_text);
    }

    public void showDialog(View v){
        //这句代码是传值关键
        final MyDialogFragment myDialogFragment = new MyDialogFragment(et_text.getText().toString());
        myDialogFragment.show(getSupportFragmentManager(),"123456");
        myDialogFragment.setStateListener(new MyDialogFragment.stateListener() {
            @Override
            public void close() {
                myDialogFragment.dismiss();
            }
        });
    }
}

方法三：使用 public方法 传值

第一步：完善 MyDialogFragment 代码

package com.wust.mydialog;


import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.DialogFragment;

import org.w3c.dom.Text;

/**
 * ClassName: MyDialogFragment <br/>
 * Description: <br/>
 * date: 2021/7/12 15:47<br/>
 *
 * @author yiqi<br />
 * @QQ 1820762465
 */
public class MyDialogFragment extends DialogFragment {
    private View mRootView;
    private Button btn_close;
    private stateListener mStateListener;
    private String mStr;
    private TextView tv_title;

    //这个是 Activity 向 DialogFragment 传值的关键代码段
    public void setTitle(String str) {
        this.mStr = str;
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //设置样式
        setStyle(DialogFragment.STYLE_NORMAL, R.style.BottomDialog);
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        if (mRootView == null){
            //获取布局
            mRootView = getLayoutInflater().inflate(R.layout.dialog_fragment,container,false);
        }

        btn_close = mRootView.findViewById(R.id.btn_close);
        btn_close.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //调用回调
                mStateListener.close();
            }
        });

        tv_title = mRootView.findViewById(R.id.tv_title);
        tv_title.setText(mStr);

        return mRootView;
    }

    @Override
    public void onStart() {
        //以下代码必须在 onStart() 方法中才有效
        Window window = getDialog().getWindow();
        WindowManager.LayoutParams params = window.getAttributes();
        params.gravity = Gravity.BOTTOM;
        params.width = WindowManager.LayoutParams.MATCH_PARENT;
        params.height = 500;
        window.setAttributes(params);
        super.onStart();
    }

    //创建回调，监听dialog的关闭
    public interface stateListener{
        void close();
    }
    //暴露接口
    public void setStateListener(stateListener listener){
        this.mStateListener = listener;
    }
}

第二步：在Activity中传值

package com.wust.mydialog;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import org.w3c.dom.Text;

public class MainActivity extends AppCompatActivity {

    private TextView tv_text;
    private EditText et_text;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv_text = findViewById(R.id.tv_text);
        et_text = findViewById(R.id.et_text);
    }

    public void showDialog(View v){
        final MyDialogFragment myDialogFragment = new MyDialogFragment();
        //这句代码是传值关键
        myDialogFragment.setTitle(et_text.getText().toString());
        myDialogFragment.show(getSupportFragmentManager(),"123456");
        myDialogFragment.setStateListener(new MyDialogFragment.stateListener() {
            @Override
            public void close() {
                myDialogFragment.dismiss();
            }
        });
    }
}

DialogFragment 向 Activity 传值

方法：回调

这里我们就借用 DialogFragment的简单使用 中的 close() 回调方法用一下，将我们刚才设置给 DialogFragment 的值 传给 Activity。

第一步：完善 MyDialogFragment 代码

package com.wust.mydialog;


import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.DialogFragment;

import org.w3c.dom.Text;

/**
 * ClassName: MyDialogFragment <br/>
 * Description: <br/>
 * date: 2021/7/12 15:47<br/>
 *
 * @author yiqi<br />
 * @QQ 1820762465
 */
public class MyDialogFragment extends DialogFragment {
    private View mRootView;
    private Button btn_close;
    private stateListener mStateListener;
    private String mStr;
    private TextView tv_title;
    private TextView tv_title1;

    //这个是 Activity 向 DialogFragment 传值的关键代码段
    public void setTitle(String str) {
        this.mStr = str;
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //设置样式
        setStyle(DialogFragment.STYLE_NORMAL, R.style.BottomDialog);
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        if (mRootView == null){
            //获取布局
            mRootView = getLayoutInflater().inflate(R.layout.dialog_fragment,container,false);
            tv_title1 = mRootView.findViewById(R.id.tv_title);
        }

        btn_close = mRootView.findViewById(R.id.btn_close);
        btn_close.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //调用回调 传值
                mStateListener.close(tv_title1.getText().toString());
            }
        });

        tv_title = mRootView.findViewById(R.id.tv_title);
        tv_title.setText(mStr);

        return mRootView;
    }

    @Override
    public void onStart() {
        //以下代码必须在 onStart() 方法中才有效
        Window window = getDialog().getWindow();
        WindowManager.LayoutParams params = window.getAttributes();
        params.gravity = Gravity.BOTTOM;
        params.width = WindowManager.LayoutParams.MATCH_PARENT;
        params.height = 500;
        window.setAttributes(params);
        super.onStart();
    }

    //创建回调，监听dialog的关闭
    public interface stateListener{
        void close(String str);
    }
    //暴露接口
    public void setStateListener(stateListener listener){
        this.mStateListener = listener;
    }
}

第二步：在Activity中接收值

package com.wust.mydialog;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import org.w3c.dom.Text;

public class MainActivity extends AppCompatActivity {

    private TextView tv_text;
    private EditText et_text;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv_text = findViewById(R.id.tv_text);
        et_text = findViewById(R.id.et_text);
    }

    public void showDialog(View v){
        final MyDialogFragment myDialogFragment = new MyDialogFragment();
        //这句代码是传值关键
        myDialogFragment.setTitle(et_text.getText().toString());
        myDialogFragment.show(getSupportFragmentManager(),"123456");
        myDialogFragment.setStateListener(new MyDialogFragment.stateListener() {
            @Override
            public void close(String str) {
                //接收值的关键
                tv_text.setText(str);
                myDialogFragment.dismiss();
            }
        });
    }
}

效果展示：

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