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Fragment进阶（4）->参数传递3种写法

分类: IT文章 • 2024-12-25 23:32:31
Fragment进阶（四）----->参数传递3种写法

Fragment进阶（4）->参数传递3种写法

同一个Activity，不同container间的参数传递

第一：在Fragment中如何获得自己控件的引用，比较这里Fragment1里的listview控件。
第二：在Fragment中如何获得其它Fragment页面中控件的引用，比如这里Fragment2里的TextView控件。

直接在fragment中操作

activity_main.xml

<span style="color:#000000;"><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/main_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    android:baselineAligned="false" >

    <fragment
        android:id="@+id/fragment1"
        android:name="com.example.harvicblog5_2.Fragment1"
        android:layout_width="0dip"
        android:layout_height="match_parent"
        android:layout_weight="1" />

    <fragment
        android:id="@+id/fragment2"
        android:name="com.example.harvicblog5_2.Fragment2"
        android:layout_width="0dip"
        android:layout_height="match_parent"
        android:layout_weight="1" />
</LinearLayout></span>

fragment1.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ff00ff"
    android:orientation="vertical" >
    
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="This is fragment 1"
        android:textColor="#000000"
        android:textSize="25sp" />

    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></ListView>
</LinearLayout>

fragment2.xml 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffff00"
    android:orientation="vertical" >
    
    <TextView
        android:id="@+id/fragment2_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="This is fragment 2"
        android:textColor="#000000"
        android:textSize="25sp" />
    
</LinearLayout>

Fragment1 

package com.example.harvicblog5_2;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class Fragment1 extends Fragment {
	private String[] mStrings = { "Abbaye de Belloc",
			"Abbaye du Mont des Cats", "Abertam", "Abondance", "Ackawi",
			"Acorn", "Adelost", "Affidelice au Chablis", "Afuega'l Pitu",
			"Airag", "Airedale", "Aisy Cendre", "Allgauer Emmentaler",
			"Abbaye de Belloc", "Abbaye du Mont des Cats", "Abertam",
			"Abondance", "Ackawi", "Acorn", "Adelost", "Affidelice au Chablis",
			"Afuega'l Pitu", "Airag", "Airedale", "Aisy Cendre",
			"Allgauer Emmentaler" };

	private TextView mFragment2_tv;
	private ListView listView;

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		View rootView = inflater.inflate(R.layout.fragment1, container, false);
		// listView = (ListView)
		// rootView.findViewById(R.id.list);//获取自己视图里的控件引用,方法一
		return rootView;
	}

	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
		super.onActivityCreated(savedInstanceState);

		mFragment2_tv = (TextView) getActivity()
				.findViewById(R.id.fragment2_tv);// 获取其它fragment中的控件引用的唯一方法!!!
		listView = (ListView) getView().findViewById(R.id.list);// 获取自己视图里的控件引用,方法二

		ArrayAdapter arrayAdapter = new ArrayAdapter<String>(getActivity(),
				android.R.layout.simple_list_item_1, mStrings);
		listView.setAdapter(arrayAdapter);
		listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				String str = mStrings[position];
				mFragment2_tv.setText(str);
			}
		});
	}
}

Fragment2 

package com.example.harvicblog5_2;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class Fragment2 extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment2, container, false);
    }

}

MainActivity 

package com.example.harvicblog5_2;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;


public class MainActivity extends FragmentActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}

*************************************************操作2****************************************************

方法二：在各自的fragment中操作

好，我们先想想要怎么解决这个问题，首先，我们把各自的事件放在各自的fragment中处理，即在fragment1中能得到当前用户点击的ITEM的String字符串，在fragment2中可以设置textview的值。那问题来了，各自获得了各自的东东，那通过什么让他们交互呢？
答案显然是activity。

activity_main.xml 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/main_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    android:baselineAligned="false" >

    <fragment
        android:id="@+id/fragment1"
        android:name="com.example.harvicblog5_3.Fragment1"
        android:layout_width="0dip"
        android:layout_height="match_parent"
        android:layout_weight="1" />

    <fragment
        android:id="@+id/fragment2"
        android:name="com.example.harvicblog5_3.Fragment2"
        android:layout_width="0dip"
        android:layout_height="match_parent"
        android:layout_weight="1" />
</LinearLayout>

fragment1.xml 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ff00ff"
    android:orientation="vertical" >
    
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="This is fragment 1"
        android:textColor="#000000"
        android:textSize="25sp" />

    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></ListView>
</LinearLayout>


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffff00"
    android:orientation="vertical" >
    
    <TextView
        android:id="@+id/fragment2_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="This is fragment 2"
        android:textColor="#000000"
        android:textSize="25sp" />
    
</LinearLayout>

Fragment1 

package com.example.harvicblog5_3;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class Fragment1 extends Fragment {
	private String[] mStrings = { "Abbaye de Belloc",
			"Abbaye du Mont des Cats", "Abertam", "Abondance", "Ackawi",
			"Acorn", "Adelost", "Affidelice au Chablis", "Afuega'l Pitu",
			"Airag", "Airedale", "Aisy Cendre", "Allgauer Emmentaler",
			"Abbaye de Belloc", "Abbaye du Mont des Cats", "Abertam",
			"Abondance", "Ackawi", "Acorn", "Adelost", "Affidelice au Chablis",
			"Afuega'l Pitu", "Airag", "Airedale", "Aisy Cendre",
			"Allgauer Emmentaler" };

	private ListView listView;

	// 定义接口变量
	private titleSelectInterface mSelectInterface;

	// Fragment间传递参数方法三，定义接口
	public interface titleSelectInterface {
		public void onTitleSelect(String title);
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		return inflater.inflate(R.layout.fragment1, container, false);
	}

	/**
	 * 将点击事件，写成一个接口，让外部去实现
	 */
	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
		super.onActivityCreated(savedInstanceState);

		listView = (ListView) getView().findViewById(R.id.list);// 获取自己视图里的控件引用,方法二
		ArrayAdapter arrayAdapter = new ArrayAdapter<String>(getActivity(),
				android.R.layout.simple_list_item_1, mStrings);
		listView.setAdapter(arrayAdapter);
		listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				String str = mStrings[position];
				mSelectInterface.onTitleSelect(str);
			}
		});
	}

	/**
	 * （2）、接口变量赋值
	 * 接口是给activity用的，所以要在activity中给这里的接口变量赋值，可以有很多方法，当然可以选择写一个setXXX(
	 * )函数来赋值,也可以要强制用户赋值。所以采用强转的方式，在fragment与activity相关联时，进行强转赋值：
	 */
	// onAttach() 回调方法(当添加fragment到activity时由系统调用)
	@Override
	public void onAttach(Activity activity) {
		super.onAttach(activity);

		try {
			mSelectInterface = (titleSelectInterface) activity;
		} catch (Exception e) {
			throw new ClassCastException(activity.toString()
					+ "must implement OnArticleSelectedListener");
		}
	}
}

Fragment2 

package com.example.harvicblog5_3;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class Fragment2 extends Fragment {
    private TextView mTv;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment2, container, false);
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        mTv = (TextView) getView().findViewById(R.id.fragment2_tv);
    }

    public void setText(String text) {
        mTv.setText(text);
    }
}

MainActivity

package com.example.harvicblog5_3;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;

public class MainActivity extends FragmentActivity implements Fragment1.titleSelectInterface {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public void onTitleSelect(String title) {
        FragmentManager manager = getSupportFragmentManager();
        Fragment2 fragment2 = (Fragment2)manager.findFragmentById(R.id.fragment2);
        fragment2.setText(title);
    }
}

***************************************方式3*********************************************************

Fragment进阶（4）->参数传递3种写法

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.harvic.fragmentarguments.MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</RelativeLayout>

fragment1.xml 

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffffff"
    android:orientation="vertical">
    <ImageView
        android:id="@+id/img_result"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:scaleType="center"/>

    <Button
        android:id="@+id/load_fragment2_btn"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="加载第二个Fragment"/>

</LinearLayout>

fragment2.xml 

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffffff"
    android:orientation="vertical">

    <TextView
        android:id="@+id/textview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="This is fragment 2"
        android:textColor="#000000"
        android:textSize="25sp" />

    <ImageView
        android:id="@+id/img1"
        android:layout_width="100dip"
        android:layout_height="100dp"
        android:scaleType="center"
        android:src="@drawable/animal1"/>

    <ImageView
        android:id="@+id/img2"
        android:layout_width="100dip"
        android:layout_height="100dp"
        android:scaleType="center"
        android:src="@drawable/animal2"/>

    <ImageView
        android:id="@+id/img3"
        android:layout_width="100dip"
        android:layout_height="100dp"
        android:scaleType="center"
        android:src="@drawable/animal3"/>

    <ImageView
        android:id="@+id/img4"
        android:layout_width="100dip"
        android:layout_height="100dp"
        android:scaleType="center"
        android:src="@drawable/animal4"/>

</LinearLayout>

MainActivity 

package com.harvic.fragmentarguments;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;


public class MainActivity extends Activity {

	/**
	 * 初始化显示fragmen1
	 */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Fragment1 fragment1 = new Fragment1();
        getFragmentManager().beginTransaction().replace(R.id.main_layout, fragment1).commit();
    }
}

Fragment1 

package com.harvic.fragmentarguments;

import android.app.FragmentTransaction;
import android.os.Bundle;
import android.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;

public class Fragment1 extends Fragment {

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		View view = inflater.inflate(R.layout.fragment1, container, false);
		Button btn = (Button) view.findViewById(R.id.load_fragment2_btn);
		//按钮点击是生成fragment2页面，
		btn.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(final View view) {
				//创建fragment2对象
				Fragment2 fragment2 = Fragment2.newInstance("从Fragment1传来的参数");

				//点击fragment2中任何一张图片进行的回调实现方法
				fragment2
						.setResultListener(new Fragment2.ICustomDialogEventListener() {
							@Override
							public void customDialogEvent(int selectID) {
								//在fragment1中显示选中的图片即可
								ImageView imageView = (ImageView) getView()
										.findViewById(R.id.img_result);
								imageView.setImageResource(selectID);
							}
						});
				//开始事物
				FragmentTransaction transaction = getFragmentManager()
						.beginTransaction();
				//替换成fragment2布局视图控件
				transaction.add(R.id.main_layout, fragment2);
				//添加到回退栈
				transaction.addToBackStack(null);
				//提交事物即可
				transaction.commit();
			}
		});
		return view;
	}
}

Fragment2 

package com.harvic.fragmentarguments;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class Fragment2 extends Fragment implements View.OnClickListener{
	/**
	 * 回调结果值
	 * @param listener
	 */
    public interface ICustomDialogEventListener {
        public void customDialogEvent(int selectID);
    }
    private ICustomDialogEventListener mCustomDialogEventListener;
    public void setResultListener(ICustomDialogEventListener listener){
    	mCustomDialogEventListener = listener;
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view =  inflater.inflate(R.layout.fragment2, container, false);
        //获取携带过来的参数
        if (getArguments() != null) {
            String mParam1 = getArguments().getString("param");
            TextView tv =  (TextView)view.findViewById(R.id.textview);
            tv.setText(mParam1);
        }
        view.findViewById(R.id.img1).setOnClickListener(this);
        view.findViewById(R.id.img2).setOnClickListener(this);
        view.findViewById(R.id.img3).setOnClickListener(this);
        view.findViewById(R.id.img4).setOnClickListener(this);
        return view;
    }

    //生成fragment2的实例对象---接收传递过来的参数
    public static Fragment2 newInstance(String text) {
        Fragment2 fragment = new Fragment2();
        Bundle args = new Bundle();
        args.putString("param", text);
        fragment.setArguments(args);
        return fragment;
    }


    @Override
    public void onClick(View view) {
        int id = view.getId();
        switch (id){
            case R.id.img1:{
            	//imageview图片参数回传！！！！！！
                mCustomDialogEventListener.customDialogEvent(R.drawable.animal1);
            }
            break;
            case R.id.img2:{
                mCustomDialogEventListener.customDialogEvent(R.drawable.animal2);
            }
            break;
            case R.id.img3:{
                mCustomDialogEventListener.customDialogEvent(R.drawable.animal3);
            }
            break;
            case R.id.img4:{
                mCustomDialogEventListener.customDialogEvent(R.drawable.animal4);
            }
            break;
        }
      //点击后，退出当前fragment
        getFragmentManager().popBackStack();
    }
}



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