Adapter条目点击,跳转到新的Activity,获取到值之后回显到adapter 条目中的某个控件中去

最新推荐文章于 2021-04-24 20:50:41 发布

原创最新推荐文章于 2021-04-24 20:50:41 发布 · 1.9k 阅读

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CC 4.0 BY-SA版权

文章标签：

#数据 #控件 #界面 #bug

博客内容介绍了如何在Adapter条目被点击后，启动新的Activity并传递数据。在新Activity中处理数据后，返回并将结果显示回Adapter的特定控件中，解决了界面交互和数据同步的问题。

//DEMO 示例   (可以直接复制粘贴验证功能--如有bug或者其他问题,欢迎留言),需要butterknife, recyclerview依赖包

package com.ontime.change;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.TextView;
//显示条目的Activity
public class MainActivity extends AppCompatActivity {
    private MyAdapter adapter;
    private RecyclerView rv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        rv = (RecyclerView) findViewById(R.id.rv);
        rv.setLayoutManager(new LinearLayoutManager(this));
        adapter = new MyAdapter(this);
        rv.setAdapter(adapter);
        adapter.notifyDataSetChanged();

        adapter.setItemClickListener(new MyAdapter.MyItemClickListener() {
            @Override
            public void onItemClick(View view, int position) {
                Intent intent = new Intent(MainActivity.this,TwoActivity.class);
                intent.putExtra("位置", position);
                startActivityForResult(intent,200);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        Bundle allData = data.getExtras();
        int pos = allData.getInt("位置");
        String price = allData.getString("新价格");

        TextView tv2 = rv.getChildAt(pos).findViewById(R.id.tv2);
        tv2.setText(price);
        adapter.notifyDataSetChanged();
    }
}

//获取需要值的Activity
package com.ontime.change;

import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import butterknife.ButterKnife;
import butterknife.InjectView;
import butterknife.OnClick;

public class TwoActivity extends AppCompatActivity{

    @InjectView(R.id.oldPrice)
    TextView oldPrice;
    @InjectView(R.id.newPrice)
    EditText newPrice;

    private SharedPreferences sp;
    private String latest;
    private int position;
    private Intent intent;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_two);
        ButterKnife.inject(this);

        sp = getSharedPreferences("价格", MODE_PRIVATE);

        intent = getIntent();
        position = intent.getIntExtra("位置", 0);

        oldPrice.setText(sp.getString("价格" + position, "暂未设置价格"));
    }

    @OnClick({R.id.btn_confirm, R.id.btn_skip})
    public void onViewClicked(View view) {

        switch (view.getId()) {
            case R.id.btn_confirm:
                latest = newPrice.getText().toString().trim();
                if (!TextUtils.isEmpty(latest)) {
                    SharedPreferences.Editor editor = sp.edit();
                    editor.putString("价格" + position, latest);
                    editor.commit();
                    Toast.makeText(this, "新价格" + latest + "更新成功", Toast.LENGTH_SHORT).show();
                    intent.putExtra("新价格", latest);
                    intent.putExtra("位置", position);
                    setResult(RESULT_OK, intent);
                    finish();
                } else {
                    Toast.makeText(this, "价格不可为空", Toast.LENGTH_SHORT).show();
                }
                break;
            case R.id.btn_skip:
                intent.putExtra("旧价格", sp.getString("价格", "暂无标签绑定"));
                intent.putExtra("位置", position);
                setResult(RESULT_OK, intent);
                finish();
                break;
            default:
                break;
        }
    }
}

//适配器Adapter
package com.ontime.change;

import android.content.Context;
import android.content.SharedPreferences;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import static android.content.Context.MODE_PRIVATE;


public class MyAdapter extends RecyclerView.Adapter {

    public MyAdapter(Context context) {
        this.context = context;
    }
    private Context context;
    private MyItemClickListener mItemClickListener;
    private SharedPreferences sp;

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.item, parent, false);
        ViewHolder viewHolder = new ViewHolder(view,mItemClickListener);
        return viewHolder;
    }

    //绑定数据
    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        final ViewHolder viewHolder = (ViewHolder) holder;
        viewHolder.tv1.setText(position + "号");
        sp = context.getSharedPreferences("价格", MODE_PRIVATE);
        viewHolder.tv2.setText(sp.getString("价格" + position, "还没有设置价格哟"));
    }

    @Override
    public int getItemCount() {
        return 3;
    }

    static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
        private TextView tv1;
        private TextView tv2;

        private MyItemClickListener mListener;

        ViewHolder(View view, MyItemClickListener myItemClickListener) {
            super(view);
            tv1 = view.findViewById(R.id.tv1);
            tv2 = view.findViewById(R.id.tv2);
            this.mListener = myItemClickListener;
            itemView.setOnClickListener(this);
        }

        @Override
        public void onClick(View view) {
            if (mListener != null) {
                mListener.onItemClick(view, getLayoutPosition());
            }
        }
    }

    public interface MyItemClickListener {
        void onItemClick(View view, int position);
    }

    public void setItemClickListener(MyItemClickListener myItemClickListener) {
        this.mItemClickListener = myItemClickListener;
    }
}

 //activity_main  布局文件<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"

    >

    <android.support.v7.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/rv"
        />
</RelativeLayout>

 //activity_two 布局文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    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"
    >

    <TextView
        android:id="@+id/tv_shake"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="10dp"
        android:text="请进行商品价格绑定绑定"
        android:textColor="@android:color/black"
        android:textSize="20sp"
        />

    <RelativeLayout
        android:id="@+id/rl_container"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/tv_shake"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"
        android:gravity="center_vertical"
        >

        <TextView
            android:id="@+id/tv_sentence"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="当前价格:"
            android:textColor="@android:color/black"
            android:textSize="15sp"
            />

        <TextView
            android:id="@+id/oldPrice"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_toRightOf="@+id/tv_sentence"
            android:gravity="center_vertical"
            android:textSize="15sp"
            />
    </RelativeLayout>

    <RelativeLayout
        android:id="@+id/rl_container_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/rl_container"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"
        >

        <TextView
            android:id="@+id/tv_sentence_1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="5dp"
            android:gravity="center_vertical"
            android:text="最新价格:"
            android:textColor="@android:color/black"
            android:textSize="15sp"
            />

        <EditText
            android:id="@+id/newPrice"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:layout_toRightOf="@+id/tv_sentence_1"
            android:gravity="center_vertical"
            android:textSize="15sp"
            />
    </RelativeLayout>


    <Button
        android:id="@+id/btn_confirm"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/rl_container_1"
        android:layout_marginTop="20dp"
        android:gravity="center"
        android:text="绑定 / 更换绑定"
        />

    <Button
        android:id="@+id/btn_skip"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/btn_confirm"
        android:layout_marginTop="20dp"
        android:gravity="center"
        android:text="暂时不更改绑定"
        />
</RelativeLayout>

//条目list 布局文件
<?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="wrap_content"
              android:orientation="vertical"
              android:layout_marginTop="20dp"
    >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="商品:   "
            android:textSize="25dp"
            />

        <TextView
            android:id="@+id/tv1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="25dp"
            />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="价格:   "
            android:textSize="25dp"
            />

        <TextView
            android:id="@+id/tv2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="25dp"
            />
    </LinearLayout>

</LinearLayout>