DialogFragment的传值问题，2年以上经验必看

于 2021-12-20 16:34:40 发布
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分类专栏： 程序员 文章标签： 面试 android 移动开发
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本文链接：https://blog.youkuaiyun.com/flutter001/article/details/122044658
本文详细介绍了如何在Android中使用DialogFragment进行数据传递，包括Activity向DialogFragment传值的两种方法，以及DialogFragment向Activity回传值的回调方法，适合有一定经验的开发者参考。

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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

  • Description:

  • date: 2021/7/12 15:47

  • @author yiqi

  • @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 an

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droidx.fragment.app.DialogFragment;

import org.w3c.dom.Text;

/**

  • ClassName: MyDialogFragment

  • Description:

  • date: 2021/7/12 15:47

  • @author yiqi

  • @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

  • Description:

  • date: 2021/7/12 15:47

  • @author yiqi

  • @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) {

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