我正在制作一个带有RecyclerView的应用程序，需要显示2个图像视图和3个文本视图。我按照developers.android.com网站上的教程进行操作。然后我尝试编辑适配器，现在我的活动不起作用。
这是我的适配器.java文件：
package com.winansbros.soccerpredictor;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private String[] mDataset1;
private String[] mDataset2;
private String[] mDataset3;
private Drawable[] mDataset4;
private Drawable[] mDataset5;
// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
public static class ViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
public TextView team1textview;
public TextView team2textview;
public TextView scoretextview;
public ImageView team1imageview;
public ImageView team2imageview;
public ViewHolder(View v) {
super(v);
team1textview = (TextView) v.findViewById(R.id.team1name);
team2textview = (TextView) v.findViewById(R.id.team2name);
scoretextview = (TextView) v.findViewById(R.id.card1score);
team1imageview = (ImageView) v.findViewById(R.id.team1imageview);
team2imageview = (ImageView) v.findViewById(R.id.team2imageview);
}
}
// Provide a suitable constructor (depends on the kind of dataset)
public MyAdapter(String[] myDataset, String[] myDataset2, String[] myDataset3, Drawable[] myDataset4, Drawable[] myDataset5) {
mDataset1 = myDataset;
mDataset2 = myDataset2;
mDataset3 = myDataset3;
mDataset4 = myDataset4;
mDataset5 = myDataset5;
}
// Create new views (invoked by the layout manager)
@Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.cardviewwidget, parent, false);
// set the view's size, margins, paddings and layout parameters
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
layoutParams.setMargins(10, 20, 10, 20);
v.setLayoutParams(layoutParams);
ViewHolder vh = new ViewHolder(v);
return vh;
}
// Replace the contents of a view (invoked by the layout manager)
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
// - get element from your dataset at this position
// - replace the contents of the view with that element
holder.team1textview.setText(mDataset1[position]);
holder.team2textview.setText(mDataset2[position]);
holder.scoretextview.setText(mDataset3[position]);
holder.team1imageview.setImageDrawable(mDataset4[position]);
holder.team2imageview.setImageDrawable(mDataset5[position]);
}
// Return the size of your dataset (invoked by the layout manager)
@Override
public int getItemCount() {
return mDataset1.length;
}
}
这是我的历史活动.java文件
package com.winansbros.soccerpredictor;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.database.Cursor;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import java.util.ArrayList;
import java.util.List;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;
public class History extends Activity {
Context CTX = this;
AdView mAdView;
AdRequest adRequest;
Button clearButton;
Button tipsButton;
StringBuilder sb;
DatabaseOperations DOP;
Integer team1image;
Integer team2image;
TypedArray imgs;
List<String> winners;
List<String> hometeams;
List<String> awayteams;
List<String> scores;
List<Drawable> homeimages;
List<Drawable> awayimages;
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
Resources res;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_history);
res = getResources();
DOP = new DatabaseOperations(CTX);
Cursor CR = DOP.getInformation(DOP);
CR.moveToFirst();
winners = new ArrayList<>();
hometeams = new ArrayList<>();
awayteams = new ArrayList<>();
scores = new ArrayList<>();
homeimages = new ArrayList<>();
awayimages = new ArrayList<>();
if( CR.moveToFirst() ) {
getHistory();
}
mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(CTX);
mRecyclerView.setLayoutManager(mLayoutManager);
String[] myDataset = hometeams.toArray(new String[hometeams.size()]);
String[] myDataset2 = awayteams.toArray(new String[awayteams.size()]);
String[] myDataset3 = scores.toArray(new String[scores.size()]);
Drawable[] myDataset4 = homeimages.toArray(new Drawable[homeimages.size()]);
Drawable[] myDataset5 = awayimages.toArray(new Drawable[awayimages.size()]);
mAdapter = new MyAdapter(myDataset, myDataset2, myDataset3, myDataset4, myDataset5);
mRecyclerView.setAdapter(mAdapter);
clearButton = (Button) findViewById(R.id.clearSQLite);
tipsButton = (Button) findViewById(R.id.TipsButton);
mAdView = (AdView) findViewById(R.id.adView);
adRequest = new AdRequest.Builder()
.addTestDevice("8AC41E108CD62B7703FF28358AEEC8BC")
.build();
mAdView.loadAd(adRequest);
Log.d("Progress", "Far");
clearButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
DatabaseOperations DOB = new DatabaseOperations(CTX);
DOB.DeleteInformation(CTX);
DOB.close();
finish();
}
});
Log.d("Progress", "First On Click Listener");
//sb = new StringBuilder();
//historyTextView = (TextView) findViewById(R.id.historyText);
//historyTextView.setMovementMethod(new ScrollingMovementMethod());
tipsButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(getApplicationContext(), TipsActivity.class);
startActivity(intent);
}
});
Log.d("Progress", "second On Click Listener");
DOP.close();
}
public void getHistory() {
Log.i("GetHistory", "Initialized");
Cursor CR = DOP.getInformation(DOP);
CR.moveToFirst();
do {
winners.add(CR.getString(0));
hometeams.add(CR.getString(1));
awayteams.add(CR.getString(2));
scores.add(CR.getString(3));
Log.d("Cloud Files", "OBJECT ID SET");
} while (CR.moveToNext());
Log.d("GetHistory", "Lists all set");
int size = winners.size();
for (int i = 0; i < size; i++)
{
if (hometeams.get(i) == "Arsenal")
{
int resID = res.getIdentifier("arsenal", "drawable", getPackageName());
homeimages.add(res.getDrawable(resID));
}
...
if (awayteams.get(i) == "Arsenal")
{
int resID = res.getIdentifier("arsenal", "drawable", getPackageName());
awayimages.add(res.getDrawable(resID));
}
if (awayteams.get(i) == "West Ham")
{
int resID = res.getIdentifier("westham", "drawable", getPackageName());
awayimages.add(res.getDrawable(resID));
}
}
Log.d("GetHistory", "Images set");
Log.d("Cloud Files", Integer.toString(size));
Log.d("Cloud Files", awayimages.get(0).toString());
}
}
这是适配器中使用的cardview：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.CardView
tools:context="com.winansbros.soccerpredictor.History"
android:id="@+id/card_view"
android:layout_gravity="center"
card_view:cardCornerRadius="4dp"
card_view:cardElevation="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:layout_width="60dp"
android:layout_height="60dp"
android:id="@+id/team1imageview"
android:layout_alignParentTop="true"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/team1name"
android:layout_centerVertical="true"
android:layout_below="@+id/team2name"
android:layout_toRightOf="@+id/team1imageview"
android:layout_toEndOf="@+id/team1imageview"
android:width="100dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/card1score"
android:width="20dp"
android:layout_centerVertical="true"
android:layout_alignTop="@+id/team1name"
android:layout_toRightOf="@+id/team1name"
android:layout_toEndOf="@+id/team1name"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/team2name"
android:width="100dp"
android:layout_centerVertical="true"
android:layout_toLeftOf="@+id/team2imageview"
android:layout_toStartOf="@+id/team2imageview"/>
<ImageView
android:layout_width="60dp"
android:layout_height="60dp"
android:id="@+id/team2imageview"
android:layout_centerVertical="true"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"/>
</RelativeLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
以下是History Activity XML文件：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
xmlns:ads="http://schemas.android.com/apk/res-auto" xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin">
<com.google.android.gms.ads.AdView
android:id="@+id/adView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
ads:adSize="BANNER"
ads:adUnitId="@string/banner_ad_unit_id">
</com.google.android.gms.ads.AdView>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Clear History"
android:id="@+id/clearSQLite"
android:layout_above="@+id/adView"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:width="150dp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Tips"
android:id="@+id/TipsButton"
android:width="150dp"
android:layout_above="@+id/adView"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"/>
<android.support.v7.widget.RecyclerView
android:id="@+id/my_recycler_view"
android:scrollbars="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@+id/clearSQLite"/>
</RelativeLayout>
最后，logcat：
...
06-13 16:51:47.510 2085-2085/com.winansbros.soccerpredictor I/GetHistory﹕ Initialized
06-13 16:51:47.510 2085-2085/com.winansbros.soccerpredictor D/Cloud Files﹕ OBJECT ID SET
06-13 16:51:47.511 2085-2085/com.winansbros.soccerpredictor D/Cloud Files﹕ OBJECT ID SET
06-13 16:51:47.511 2085-2085/com.winansbros.soccerpredictor D/GetHistory﹕ Lists all set
06-13 16:51:47.511 2085-2085/com.winansbros.soccerpredictor D/GetHistory﹕ Images set
06-13 16:51:47.511 2085-2085/com.winansbros.soccerpredictor D/Cloud Files﹕ 2
06-13 16:51:47.511 2085-2085/com.winansbros.soccerpredictor D/AndroidRuntime﹕ Shutting down VM
06-13 16:52:07.545 2085-2095/com.winansbros.soccerpredictor I/art﹕ Thread[5,tid=2095,WaitingInMainSignalCatcherLoop,Thread*=0xb4a33c00,peer=0x12c000a0,"Signal Catcher"]: reacting to signal 3
06-13 16:52:07.545 2085-2095/com.winansbros.soccerpredictor I/art﹕ [ 06-13 16:52:07.745 546: 569 I/Process ]
Sending signal. PID: 546 SIG: 3