我正在制作一个预测足球比赛获胜者的应用程序。我是android编程新手，所有recyclerview教程都有点令人困惑，但我需要将每个用户预测的所有信息放入cardview中，所以我将所有xml代码转移到java中，但是当我进行此 Activity 时，它说立即关闭虚拟机，但我没有收到任何输入的日志消息。预测中的所有用户数据都位于 SQLite 数据库中，可以读取该数据库以获取信息。下面是我的 java 和 xml 文件，如果可能的话，我希望最终不必使用 xml 文件。
历史 Activity Java 文件:
package com.winansbros.soccerpredictor;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.res.TypedArray;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v7.widget.CardView;
import android.text.method.ScrollingMovementMethod;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdSize;
import com.google.android.gms.ads.AdView;
public class History extends Activity {
TextView historyTextView;
Context CTX = this;
AdView mAdView;
AdRequest adRequest;
Button clearButton;
Button tipsButton;
StringBuilder sb;
DatabaseOperations DOP;
Integer team1image = 1;
Integer team2image = 1;
AdView adview = new AdView(CTX);
Button clearHistory = new Button(CTX);
Button tips = new Button(CTX);
RelativeLayout mainrl = new RelativeLayout(CTX);
TypedArray imgs = getResources().obtainTypedArray(R.array.images);
public void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
DOP = new DatabaseOperations(CTX);
Cursor CR = DOP.getInformation(DOP);
CR.moveToFirst();
if( CR != null && CR.moveToFirst() ){
RelativeLayout.LayoutParams mainrlp = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
mainrl.setLayoutParams(mainrlp);
String adid = getResources().getString(R.string.banner_ad_unit_id);
RelativeLayout.LayoutParams adviewlayoutparams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
adviewlayoutparams.addRule(RelativeLayout.CENTER_HORIZONTAL);
adviewlayoutparams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
RelativeLayout.LayoutParams clearHistoryLP = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
clearHistoryLP.addRule(RelativeLayout.ABOVE, adview.getId());
clearHistoryLP.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
RelativeLayout.LayoutParams tipsbuttonlp = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
tipsbuttonlp.addRule(RelativeLayout.ABOVE, adview.getId());
tipsbuttonlp.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
adview.setAdSize(AdSize.BANNER);
adview.setAdUnitId(adid);
adview.setLayoutParams(adviewlayoutparams);
clearHistory.setLayoutParams(clearHistoryLP);
tips.setLayoutParams(tipsbuttonlp);
clearHistory.setText("Clear History");
tips.setText("Tips");
mainrl.addView(adview);
mainrl.addView(clearHistory);
mainrl.addView(tips);
setContentView(mainrl);
CR.close();
getHistory();
} else
{
setContentView(R.layout.activity_history);
clearButton = (Button) findViewById(R.id.clearSQLite);
tipsButton = (Button) findViewById(R.id.TipsButton);
}
mAdView = (AdView) this.findViewById(R.id.adView);
adRequest = new AdRequest.Builder()
.addTestDevice("8AC41E108CD62B7703FF28358AEEC8BC")
.build();
mAdView.loadAd(adRequest);
clearButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
DatabaseOperations DOB = new DatabaseOperations(CTX);
DOB.DeleteInformation(CTX);
DOB.close();
finish();
}
});
//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);
}
});
DOP.close();
}
public void getHistory() {
Log.i("GetHistory", "Initialized");
Cursor CR = DOP.getInformation(DOP);
CR.moveToFirst();
List<String> winners = new ArrayList<>();
List<String> hometeams = new ArrayList<>();
List<String> awayteams = new ArrayList<>();
List<String> scores = new ArrayList<>();
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");
setImages(hometeams, awayteams);
Log.d("GetHistory", "Images set");
int size = winners.size();
Log.d("Cloud Files", Integer.toString(size));
for (int i = 0; i < size; i++) {
Log.d("GetHistory", "Starting For Loop");
CardView cv = new CardView(CTX);
RelativeLayout ll = new RelativeLayout(CTX);
TextView team1name = new TextView(CTX);
TextView team2name = new TextView(CTX);
ImageView team1imageview = new ImageView(CTX);
ImageView team2imageview = new ImageView(CTX);
TextView cardscore = new TextView(CTX);
Log.d("GetHistory", "Views set up");
RelativeLayout.LayoutParams rlp = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
lp.addRule(RelativeLayout.CENTER_IN_PARENT);
RelativeLayout.LayoutParams imageview1 = new RelativeLayout.LayoutParams(60, 60);
imageview1.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
imageview1.addRule(RelativeLayout.ALIGN_PARENT_START);
imageview1.addRule(RelativeLayout.CENTER_VERTICAL);
RelativeLayout.LayoutParams imageview2 = new RelativeLayout.LayoutParams(60, 60);
imageview2.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
imageview2.addRule(RelativeLayout.ALIGN_PARENT_END);
imageview2.addRule(RelativeLayout.CENTER_VERTICAL);
RelativeLayout.LayoutParams textview1 = new RelativeLayout.LayoutParams(100, RelativeLayout.LayoutParams.WRAP_CONTENT);
textview1.addRule(RelativeLayout.CENTER_VERTICAL);
textview1.addRule(RelativeLayout.RIGHT_OF, team1imageview.getId());
textview1.addRule(RelativeLayout.END_OF, team1imageview.getId());
textview1.addRule(RelativeLayout.BELOW, team2name.getId());
RelativeLayout.LayoutParams textview2 = new RelativeLayout.LayoutParams(100, RelativeLayout.LayoutParams.WRAP_CONTENT);
textview2.addRule(RelativeLayout.CENTER_VERTICAL);
textview2.addRule(RelativeLayout.LEFT_OF, team2imageview.getId());
textview2.addRule(RelativeLayout.START_OF, team2imageview.getId());
textview2.addRule(RelativeLayout.BELOW, team2name.getId());
RelativeLayout.LayoutParams textview3 = new RelativeLayout.LayoutParams(20, RelativeLayout.LayoutParams.WRAP_CONTENT);
textview3.addRule(RelativeLayout.CENTER_VERTICAL);
textview3.addRule(RelativeLayout.RIGHT_OF, team1name.getId());
textview3.addRule(RelativeLayout.END_OF, team1name.getId());
textview3.addRule(RelativeLayout.BELOW, team2name.getId());
Log.d("GetHistory", "Layout params set");
team1name.setText(hometeams.get(i));
team2name.setText(awayteams.get(i));
team1imageview.setImageResource(imgs.getResourceId(team1image, -1));
cardscore.setText(scores.get(i));
team2imageview.setImageResource(imgs.getResourceId(team2image, -1));
team1imageview.setLayoutParams(imageview1);
team2imageview.setLayoutParams(imageview2);
team2name.setLayoutParams(textview1);
team1name.setLayoutParams(textview2);
cardscore.setLayoutParams(textview3);
Log.d("GetHistory", "views set to parents");
mainrl.addView(cv);
cv.setLayoutParams(lp);
ll.setLayoutParams(rlp);
cv.addView(ll);
ll.addView(team1imageview);
ll.addView(team1name);
ll.addView(team2imageview);
ll.addView(team2name);
ll.addView(cardscore);
Log.d("GetHistory", "views set to objects");
Log.d("GetHistory", "views values set");
setContentView(mainrl);
imgs.recycle();
/**if (appendSeparator) sb.append("\n");
appendSeparator = true;
sb.append(hometeams.get(i));
sb.append(" ");
sb.append(scores.get(i));
sb.append(" ");
sb.append(awayteams.get(i));
historyTextView.setText(sb.toString());*/
}
}
public void setImages(List<String> hometeams, List<String> awayteams)
{
String[] bplteams = new String[20];
bplteams[0] = "Arsenal";
bplteams[1] = "Aston Villa";
bplteams[2] = "Burnley";
bplteams[3] = "Chelsea";
bplteams[4] = "Crystal Palace";
bplteams[5] = "Everton";
bplteams[6] = "Hull City";
bplteams[7] = "Leicester City";
bplteams[8] = "Liverpool";
bplteams[9] = "Man City";
bplteams[10] = "Man United";
bplteams[11] = "Newcastle";
bplteams[12] = "QPR";
bplteams[13] = "Southampton";
bplteams[14] = "Stoke City";
bplteams[15] = "Sunderland";
bplteams[16] = "Swansea City";
bplteams[17] = "Tottenham";
bplteams[18] = "West Brom";
bplteams[19] = "West Ham";
String[] laligateams = new String[20];
laligateams[0] = "Almería";
laligateams[1] = "Athletic Bilbao";
laligateams[2] = "Athlético Madrid";
laligateams[3] = "Barcalona";
laligateams[4] = "Celta Vigo";
laligateams[5] = "Córdoba";
laligateams[6] = "Deportivo La Coruña";
laligateams[7] = "Eibar";
laligateams[8] = "Elche";
laligateams[9] = "Espanyol";
laligateams[10] = "Getafe";
laligateams[11] = "Granada";
laligateams[12] = "Levante";
laligateams[13] = "Málaga";
laligateams[14] = "Rayo Vallecano";
laligateams[15] = "Real Madrid";
laligateams[16] = "Real Sociedad";
laligateams[17] = "Sevilla";
laligateams[18] = "Valencia";
laligateams[19] = "Villarreal";
for (int i = 0; i < hometeams.size(); i++)
{
if (hometeams.get(i) == bplteams[i])
{
team1image = i;
} else if (hometeams.get(i) == laligateams[i])
{
team1image = i;
} else if (awayteams.get(i) == bplteams[i])
{
team1image = i;
} else if (awayteams.get(i) == laligateams[i])
{
team2image = i;
}
}
}
}
历史 Activity 的 XML 文件:
<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.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>
</RelativeLayout>
有什么建议吗？我还是 Android 开发新手，所以这可能是非常简单的事情。预先感谢您。
最佳答案
仅保留这些声明
AdView adview = new AdView(CTX);
Button clearHistory = new Button(CTX);
Button tips = new Button(CTX);
RelativeLayout mainrl = new RelativeLayout(CTX);
TypedArray imgs = getResources().obtainTypedArray(R.array.images);
并至少在 super.onCreate() 之后移动赋值(和初始化)。
关于java - Android 应用程序在转而使用 java 创建布局后停止工作，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30821328/