关于fragment，代码错哪了

YXTS122 2018-01-12 12:57:17

package com.example.gment;





import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.support.v4.app.FragmentActivity;

import android.support.v4.app.FragmentManager;

import android.support.v4.app.FragmentTransaction;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;



public class MainActivity extends FragmentActivity implements OnClickListener {

	private Button btn;

	private Fragment current;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

		btn=(Button)findViewById(R.id.btn);

		btn.setOnClickListener(this);

		current=new Fragment();

	}

	

	 @Override

	    public void onClick(View v) {

	        switch (v.getId()) {

	        case R.id.btn:

	            Fragment1 fragment1=new Fragment1();

	            FragmentManager fragmentManager=getSupportFragmentManager();

	            FragmentTransaction transaction=fragmentManager.beginTransaction();

	            if(current==fragment1)

	            	break;

	            else{

	            	transaction.hide(current);

	            transaction.show(fragment1);

	            transaction.commit();

	            }

	        }

	 }



	@Override

	public boolean onCreateOptionsMenu(Menu menu) {

		// Inflate the menu; this adds items to the action bar if it is present.

		getMenuInflater().inflate(R.menu.main, menu);

		return true;

	}



	@Override

	public boolean onOptionsItemSelected(MenuItem item) {

		// Handle action bar item clicks here. The action bar will

		// automatically handle clicks on the Home/Up button, so long

		// as you specify a parent activity in AndroidManifest.xml.

		int id = item.getItemId();

		if (id == R.id.action_settings) {

			return true;

		}

		return super.onOptionsItemSelected(item);

	}

}

...全文

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YXTS122 2018-02-10

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YXTS122 2018-02-10

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public class MainActivity extends FragmentActivity implements OnClickListener {
    private Button btn;
    private TextView textView5;
    private Fragment current;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn=(Button)findViewById(R.id.btn);
        textView5=(TextView)findViewById(R.id.textView5);
        btn.setOnClickListener(this);
        current=new Fragment();
    }
     
     @Override
        public void onClick(View v) {
            switch (v.getId()) {
            case R.id.btn:
            	try {
                Fragment1 fragment1=new Fragment1();
                FragmentManager fragmentManager=getSupportFragmentManager();
                FragmentTransaction transaction=fragmentManager.beginTransaction();
                if(current==fragment1)
                    break;
                if(!fragment1.isAdded())
                {
                    transaction.hide(current);
                    transaction.add(R.id.cont, fragment1);
                    transaction.commit();
                }
                else{
                    transaction.hide(current);
                transaction.show(fragment1);
                transaction.commit();
                }
                current=fragment1;
                break;
            }
            	catch(Exception e)
            	{
            	     Log.d("报错", e.toString());
            	     textView5.setText(e.toString());
            	}
            }
     }}

public class Fragment1 extends android.support.v4.app.Fragment {
 
private Bitmap bitmap;
private Button btn; 
private Button btn1;
 
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
{
View v=inflater.inflate(R.layout.y1, container, false); //让fragment关联布局文件
//intent = new Intent(getActivity(),Shoppingtrolley.class);//转跳到Shoppingtrolley
 
btn=(Button)v.findViewById(R.id.btn11);//第一个按钮
btn1=(Button)v.findViewById(R.id.btn12);//第二个按钮
bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.abc_ab_bottom_solid_dark_holo);
 
return v;
}
 
@Override 
public void onActivityCreated(Bundle savedInstanceState) { 
// TODO Auto-generated method stub 
super.onActivityCreated(savedInstanceState); 
 
btn.setOnClickListener(new OnClickListener() { 
 
@Override 
public void onClick(View v) { 
// TODO Auto-generated method stub 
Intent	intent1 = new Intent(getActivity(),Shoppingtrolley.class);
intent1.putExtra("bitmap",bitmap);//传一张图片
intent1.putExtra("整数", 38);//传一个int型的数值
startActivity(intent1);//启动转跳
Toast.makeText(getActivity(),"提交至购物车",0).show(); 
} 
}); 
 
btn1.setOnClickListener(new OnClickListener() { 
 
@Override 
public void onClick(View v) { 
// TODO Auto-generated method stub 
	Intent	intent2 = new Intent(getActivity(),Shoppingtrolley.class);
startActivity(intent2);//启动转跳 
Toast.makeText(getActivity(),"提交至购物车",0).show(); 
} 
});
 
}
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.gment.MainActivity"
    android:orientation="vertical" >
    <FrameLayout 
               android:id="@+id/cont"
               android:layout_width="match_parent"
               android:layout_height="410dp">
     </FrameLayout>
    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/textView5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

为谁点墨成痴 2018-02-08

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是v4和v7的问题吧

Yunc2 2018-01-19

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把 Fragment1 的Fragment 改成 android.support.v4.app.Fragment

一纸荒年-and 2018-01-19

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Fragment1 要继承v4包Fragment（android.support.v4.app.Fragment）

YXTS122 2018-01-12

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package com.example.gment;

import android.app.Fragment;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;

public class Fragment1 extends Fragment {

private Bitmap bitmap;
private Button btn; 
private Button btn1;
Intent intent;

@Override
public View onCreateView(LayoutInflater inflater,@Nullable ViewGroup container, @Nullable Bundle savedInstanceState) 
{
View v=inflater.inflate(R.layout.y1, container, false); //让fragment关联布局文件
intent = new Intent(getActivity(),Shoppingtrolley.class);//转跳到Shoppingtrolley

btn=(Button)v.findViewById(R.id.btn11);//第一个按钮
btn1=(Button)v.findViewById(R.id.btn12);//第二个按钮
bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.abc_ab_bottom_solid_dark_holo);

return v;
}

@Override 
public void onActivityCreated(Bundle savedInstanceState) { 
// TODO Auto-generated method stub 
super.onActivityCreated(savedInstanceState); 

btn.setOnClickListener(new OnClickListener() { 

@Override 
public void onClick(View v) { 
// TODO Auto-generated method stub 
intent.putExtra("bitmap",bitmap);//传一张图片
intent.putExtra("整数", 38);//传一个int型的数值
startActivity(intent);//启动转跳
Toast.makeText(getActivity(),"提交至购物车",0).show(); 
} 
}); 

btn1.setOnClickListener(new OnClickListener() { 

@Override 
public void onClick(View v) { 
// TODO Auto-generated method stub 
startActivity(intent);//启动转跳 
Toast.makeText(getActivity(),"提交至购物车",0).show(); 
} 
});

}
}

package com.example.gment;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.TextView;

public class Shoppingtrolley extends Activity {

private Bitmap bitmap,bitmap1;
ImageView imageview,imageview1;
TextView tv;
int price;

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

imageview=(ImageView)findViewById(R.id.imageView1);
tv=(TextView) findViewById(R.id.textView2);

Intent intent=getIntent();
if(intent!=null)
{
bitmap=intent.getParcelableExtra("bitmap");
imageview.setImageBitmap(bitmap);
//price=getIntent().getExtras().getInt("整数");
price=intent.getIntExtra("整数", 0);
tv.setText("¥"+price+"");

}

}

}

Jing丶無雙 2018-01-12

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如果你想比较当前Fragment是不是同一个Fragment 可以这样做举个例子：

Class<Fragment> c1 = Fragment.class;
Class<Fragment1> c2 = Fragment1.class; 
if(c1.toString().equals(c2.toString())){

}

顽固已死_有事烧纸 2018-01-12

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一个是Fragment 一个是Fragment1 当然不能比较。。。而且比较对象这件事本身也不推荐

请参考： Android学习小Demo（17）关于ViewPager和Fragment的使用 http://blog.csdn.net/linmiansheng/article/details/23282797

原来做的一个练手的项目，里面主要是Fragment的嵌套，需要的朋友可以看下，如果遇到不能运行的状况可酌量删除些代码。

FragmentPagerAdapter刷新fragment最完美解决方案源代码

此为示例代码，详细讲解请参考： http://blog.csdn.net/guolin_blog/article/details/13171191 如对资源内容有疑问，请到博客里留言。

此为示例代码，详细讲解请参考 http://blog.csdn.net/sinyu890807/article/details/8744943

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