的Android应用程序崩溃,一旦重新打开
我不仅是新的到Android工作室,我是新来的,一般的编程(我一直在慢慢地教自己,我能在过去一年左右作为业余爱好)。的Android应用程序崩溃,一旦重新打开
我碰到我的Android应用程序的问题,我无法找到答案 - 尽管我知道很多人都问过类似的问题,我似乎无法理解的解决方案,足以使其适应我的特殊问题。编译时,我的应用程序将运行良好,并做我希望它“正确”做的所有事情(除了一个小工具,但我会后来哈哈)。
的一件事它没有做到的是开放的,我关闭后,其正确。我可以进入主屏幕并返回到应用程序,但如果我完全关闭应用程序并尝试重新打开,则表示它“一直停止”。
现在,我认为这将是给你我的代码(也有在此应用程序只有两个活动),我的“logcat的”有用。然而,我目前正试图读取和理解如何检索我的“logcat”在第一个地方哈哈,所以希望我会很快在这里。
从我读我的理解是,我的问题是,要么我声明了全局变量或东西与按钮ID时,我做的按钮动态的。我遇到了与他们的“主题”有关的人,但我无法将其与我的特定位置相关联。但是,如果这些问题中的任何一个是问题,我很难理解问题实际上是什么。
这里是我的主要活动......
package com.example.getcoins;
import android.content.Intent;
import android.icu.text.DecimalFormat;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.jjoe64.graphview.GraphView;
import com.jjoe64.graphview.series.DataPoint;
import com.jjoe64.graphview.series.PointsGraphSeries;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
int intialCoins = 21;
int coins;
int buttonColor = android.graphics.Color.rgb(0, 150, 150);
int textColor = android.graphics.Color.rgb(255, 255, 255);
ArrayList<Integer> coinsOverTime = new ArrayList<Integer>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
setSupportActionBar(myToolbar);
Intent intent = getIntent();
coins = intent.getIntExtra("COINS", 1);
if (intent.getExtras() != null)
{
Boolean winner = intent.getBooleanExtra("WINNER", true);
int gambleamount = intent.getIntExtra("GAMBLE", 1);
Bundle bundle = intent.getExtras();
coinsOverTime = bundle.getIntegerArrayList("COIN_HISTORY");
if (winner == true)
{
coins = coins + gambleamount;
coinsOverTime.add(coins);
}
if (winner == false && gambleamount == 1)
{
coins = coins;
coinsOverTime.add(coins);
}
else if(winner == false)
{
coins = coins - gambleamount;
coinsOverTime.add(coins);
}
}
else
{
coins = intialCoins;
coinsOverTime.add(coins);
}
String number = Integer.toString(coins);
double amount = Double.parseDouble(number);
DecimalFormat formatter = new DecimalFormat("#,###");
String formatted = formatter.format(amount);
TextView textView = (TextView) findViewById(R.id.textView);
textView.setText(formatted);
GraphView graph = (GraphView) findViewById(R.id.graph);
PointsGraphSeries<DataPoint> series = new PointsGraphSeries<>(generateData());
graph.addSeries(series);
series.setShape(PointsGraphSeries.Shape.POINT);
graph.getViewport().setXAxisBoundsManual(true);
graph.getViewport().setMinX(0);
graph.getViewport().setMaxX(coinsOverTime.size());
if (coins >= 0 && coins < 101)
{
Button getCoinButton = addButton("Get 1 coin");
getCoinButton.setId(R.id.one);
getCoinButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
getOneCoin(v);
}
});
}
if (coins >= 11 && coins < 501)
{
Button getCoinButton = addButton("Get 10 coins");
getCoinButton.setId(R.id.ten);
getCoinButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
getTenCoins(v);
}
});
}
if (coins >= 21 && coins < 2001)
{
Button getCoinButton = addButton("Get 20 coins");
getCoinButton.setId(R.id.twenty);
getCoinButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
getTwentyCoins(v);
}
});
}
if (coins >= 101 && coins < 5001)
{
Button getCoinButton = addButton("Get 100 coins");
getCoinButton.setId(R.id.one_hundred);
getCoinButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
getOneHundredCoins(v);
}
});
}
if (coins >= 501 && coins < 10001)
{
Button getCoinButton = addButton("Get 500 coins");
getCoinButton.setId(R.id.five_hundred);
getCoinButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
getFiveHundredCoins(v);
}
});
}
if (coins >= 2001)
{
Button getCoinButton = addButton("Get 2,000 coins");
getCoinButton.setId(R.id.two_thousand);
getCoinButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
getTwoThousandCoins(v);
}
});
}
if (coins >= 5001)
{
Button getCoinButton = addButton("Get 5,000 coins");
getCoinButton.setId(R.id.five_thousand);
getCoinButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
getFiveThousandCoins(v);
}
});
}
if (coins >= 10001)
{
Button getCoinButton = addButton("Get 10,000 coins");
getCoinButton.setId(R.id.ten_thousand);
getCoinButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
getTenThousandCoins(v);
}
});
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.action_items, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.rules:
// User chose the "Settings" item, show the app settings UI...
return true;
case R.id.action_settings:
// User chose the "Favorite" action, mark the current item
// as a favorite...
return true;
case android.R.id.home:
return true;
default:
// If we got here, the user's action was not recognized.
// Invoke the superclass to handle it.
return super.onOptionsItemSelected(item);
}
}
public void getOneCoin(View view){
Intent intent = new Intent(this, gamble.class);
Bundle bundle = new Bundle();
bundle.putIntegerArrayList("COIN_HISTORY", coinsOverTime);
intent.putExtra("GAMBLE", 1);
intent.putExtra("COINS", coins);
intent.putExtras(bundle);
startActivity(intent);
}
public void getTenCoins(View view){
Intent intent = new Intent(this, gamble.class);
Bundle bundle = new Bundle();
bundle.putIntegerArrayList("COIN_HISTORY", coinsOverTime);
intent.putExtra("GAMBLE", 10);
intent.putExtra("COINS", coins);
intent.putExtras(bundle);
startActivity(intent);
}
public void getTwentyCoins(View view){
Intent intent = new Intent(this, gamble.class);
Bundle bundle = new Bundle();
bundle.putIntegerArrayList("COIN_HISTORY", coinsOverTime);
intent.putExtra("GAMBLE", 20);
intent.putExtra("COINS", coins);
intent.putExtras(bundle);
startActivity(intent);
}
public void getOneHundredCoins(View view){
Intent intent = new Intent(this, gamble.class);
Bundle bundle = new Bundle();
bundle.putIntegerArrayList("COIN_HISTORY", coinsOverTime);
intent.putExtra("GAMBLE", 100);
intent.putExtra("COINS", coins);
intent.putExtras(bundle);
startActivity(intent);
}
public void getFiveHundredCoins(View view){
Intent intent = new Intent(this, gamble.class);
Bundle bundle = new Bundle();
bundle.putIntegerArrayList("COIN_HISTORY", coinsOverTime);
intent.putExtra("GAMBLE", 500);
intent.putExtra("COINS", coins);
intent.putExtras(bundle);
startActivity(intent);
}
public void getTwoThousandCoins(View view){
Intent intent = new Intent(this, gamble.class);
Bundle bundle = new Bundle();
bundle.putIntegerArrayList("COIN_HISTORY", coinsOverTime);
intent.putExtra("GAMBLE", 2000);
intent.putExtra("COINS", coins);
intent.putExtras(bundle);
startActivity(intent);
}
public void getFiveThousandCoins(View view){
Intent intent = new Intent(this, gamble.class);
Bundle bundle = new Bundle();
bundle.putIntegerArrayList("COIN_HISTORY", coinsOverTime);
intent.putExtra("GAMBLE", 5000);
intent.putExtra("COINS", coins);
intent.putExtras(bundle);
startActivity(intent);
}
public void getTenThousandCoins(View view){
Intent intent = new Intent(this, gamble.class);
Bundle bundle = new Bundle();
bundle.putIntegerArrayList("COIN_HISTORY", coinsOverTime);
intent.putExtra("GAMBLE", 10000);
intent.putExtra("COINS", coins);
intent.putExtras(bundle);
startActivity(intent);
}
public Button addButton(String name)
{
LinearLayout linearLayout = (LinearLayout) findViewById(R.id.linearLayout);
Button newCoinButton = new Button(this);
newCoinButton.setText(name);
newCoinButton.setTextSize(30);
//newCoinButton.setBackgroundColor(buttonColor);
newCoinButton.setTextColor(textColor);
//newCoinButton.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));
linearLayout.addView(newCoinButton);
return newCoinButton;
}
public DataPoint[] generateData()
{
int size = coinsOverTime.size();
DataPoint[] values = new DataPoint[size];
for (int i=0; i<size; i++)
{
int y1 = coinsOverTime.get(i);
DataPoint v = new DataPoint(i, y1);
values[i] = v;
}
return values;
}
}
和这里的赌博活动也会谈...
package com.example.getcoins;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.View;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.Collections;
public class gamble extends AppCompatActivity {
ArrayList<Integer> buttonValues = getButtonValues();
//ArrayList<Integer> coinHistory = getCoinHistory();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_gamble);
Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
setSupportActionBar(myToolbar);
ActionBar ab = getSupportActionBar();
ab.setDisplayHomeAsUpEnabled(false);
TextView textViewLeft = (TextView) findViewById(R.id.textView2);
TextView textViewRight = (TextView) findViewById(R.id.textView3);
TextView textViewCoins = (TextView) findViewById(R.id.textView4);
textViewCoins.setText("Good Luck!");
if (buttonValues.get(0) == 0)
{
textViewLeft.setText("Winner");
}
else
{
textViewLeft.setText("Loser");
}
if (buttonValues.get(1) == 0)
{
textViewRight.setText("Winner");
}
else
{
textViewRight.setText("Loser");
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.action_items, menu);
return true;
}
public ArrayList<Integer> getButtonValues()
{
ArrayList<Integer> buttonvalues = new ArrayList<Integer>();
buttonvalues.add(0);
buttonvalues.add(1);
Collections.shuffle(buttonvalues);
return buttonvalues;
}
public void leftButtonClick(View view)
{
if (buttonValues.get(0) == 0)
{
winner();
}
else
{
loser();
}
}
public void rightButtonClick(View view)
{
if (buttonValues.get(1) == 0)
{
winner();
}
else
{
loser();
}
}
public void winner()
{
Intent oldintent = getIntent();
Bundle oldbundle = oldintent.getExtras();
int gambleamount = oldintent.getIntExtra("GAMBLE", 1);
int coins = oldintent.getIntExtra("COINS", 1);
ArrayList<Integer> coinHistory = oldbundle.getIntegerArrayList("COIN_HISTORY");
Intent intent = new Intent(this, MainActivity.class);
Bundle bundle = new Bundle();
bundle.putIntegerArrayList("COIN_HISTORY", coinHistory);
intent.putExtra("WINNER", true);
intent.putExtra("GAMBLE", gambleamount);
intent.putExtra("COINS", coins);
intent.putExtras(bundle);
startActivity(intent);
}
public void loser()
{
Intent oldintent = getIntent();
Bundle oldbundle = oldintent.getExtras();
int gambleamount = oldintent.getIntExtra("GAMBLE", 1);
int coins = oldintent.getIntExtra("COINS", 1);
ArrayList<Integer> coinHistory = oldbundle.getIntegerArrayList("COIN_HISTORY");
Intent intent = new Intent(this, MainActivity.class);
Bundle bundle = new Bundle();
bundle.putIntegerArrayList("COIN_HISTORY", coinHistory);
intent.putExtra("WINNER", false);
intent.putExtra("GAMBLE", gambleamount);
intent.putExtra("COINS", coins);
intent.putExtras(bundle);
startActivity(intent);
}
}
我感谢所有帮助任何人都可能能够提供。
卢克
更新:这是我的logcat的......或者至少是我认为这是相关部分。一旦发生事故,我抓住了它给我的文字。
04-06 16:10:39.091 3897-3897/? I/art: Late-enabling -Xcheck:jni
04-06 16:10:39.322 3897-3897/com.example.getcoins W/System: ClassLoader referenced unknown path: /data/app/com.example.getcoins-1/lib/arm64
04-06 16:10:39.363 3897-3897/com.example.getcoins I/InstantRun: Starting Instant Run Server for com.example.getcoins
04-06 16:10:42.158 3897-3897/com.example.getcoins W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
04-06 16:10:42.643 3897-3897/com.example.getcoins D/AndroidRuntime: Shutting down VM
04-06 16:10:42.645 3897-3897/com.example.getcoins E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.getcoins, PID: 3897
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.getcoins/com.example.getcoins.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.util.ArrayList.add(java.lang.Object)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2671)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2736)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1478)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6154)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.util.ArrayList.add(java.lang.Object)' on a null object reference
at com.example.getcoins.MainActivity.onCreate(MainActivity.java:50)
at android.app.Activity.performCreate(Activity.java:6683)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1140)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2624)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2736)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1478)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6154)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
UPDATE:
首先,感谢您的答复!这对我来说非常有教育意义!我想按照我目前的想法运行,看看我是否在正确的轨道上。看起来,当应用程序首次编译到我的手机上时,一切都可以(即主要活动中的全局变量可以正确查看和处理)。
然而,看着链接后帕维尔B.建议我看看,好像是通过这个过程...... A simplified illustration of the activity lifecycle.
......一旦我终止该应用并打开它回来了,它会直接到onCreate()方法(并且似乎跳过了上面定义的全局变量)。这是怎么回事?
我投了评论,我发现有用的,但它说,因为我的名声小于15也不会公开。
再次谢谢你太棒了!
卢克
这可能会或可能不会解决您的问题,但是当你从你的主要活动打电话给你的“赌博”的活动,你应该使用startActivityForResult(),并注册一个回调接收处理结果.. 。
即你目前“正在启动”您的主要活动本身上,而不是仅仅通过的setResult
见传递结果返回给它:
https://developer.android.com/training/basics/intents/result.html
和
https://developer.android.com/reference/android/os/ResultReceiver.html
UPDATE:
考虑创建一个静态的最终请求的代码,你可以使用:
public static final int REQUEST_CODE_GAMBLE = 172;
改变你的getCoin方法startActivityForResult( ),使用你的st ATIC请求代码:
public void getOneCoin(View view){
Intent intent = new Intent(this, gamble.class);
Bundle bundle = new Bundle();
bundle.putIntegerArrayList("COIN_HISTORY", coinsOverTime);
intent.putExtra("GAMBLE", 1);
intent.putExtra("COINS", coins);
intent.putExtras(bundle);
startActivityForResult(intent, REQUEST_CODE_GAMBLE);
}
然后重写onActivityResult()在您的MainActivity:
@Override
protected void onActivityResult(final int requestCode, final int resultCode, final Intent intent){
super.onActivityResult(requestCode, resultCode, intent);
if(requestCode == REQUEST_CODE_GAMBLE){
if(resultCode == RESULT_OK){
//do all that same stuff you were doing in onCreate() in your MainActivity
//i.e. :
coins = intent.getIntExtra("COINS", 1);
//etc
}
}
}
然后在冠军()和输家()在赌博活动的方法,简单地设置结果并致电完成():
public void winner()
{
Intent oldintent = getIntent();
Bundle oldbundle = oldintent.getExtras();
int gambleamount = oldintent.getIntExtra("GAMBLE", 1);
int coins = oldintent.getIntExtra("COINS", 1);
ArrayList<Integer> coinHistory = oldbundle.getIntegerArrayList("COIN_HISTORY");
Intent intent = new Intent();
Bundle bundle = new Bundle();
bundle.putIntegerArrayList("COIN_HISTORY", coinHistory);
intent.putExtra("WINNER", true);
intent.putExtra("GAMBLE", gambleamount);
intent.putExtra("COINS", coins);
intent.putExtras(bundle);
getParent().setResult(Activity.RESULT_OK, intent);
finish();
}
当您的赌博活动y“完成”,它会将所有意图数据发送到您的MainActivity的新的onActivityResult()方法,并且您可以使用它执行您想要的操作
非常感谢你为这个信息buradd!我还没有听说过这个功能,但它肯定听起来像是即使这不是我目前问题的解决方法,也是我想要做的事情,所以谢谢!我也在上面添加了我的logcat。 –
不客气,如果它可以帮助你考虑投票 - 如果它最终解决了你的问题,考虑接受答案..在查看你的logcat后,我相信这会解决你的问题,因为你的崩溃是因为你的数组列表为空,因为它没有从意图中得到任何东西,因为你的主要活动已经在没有它的情况下创建了。将这些数据放入onActivityResult()的回调接收器中很可能会解决这个问题 – buradd
在与一位朋友交谈后,他暗示我没有“ t正确地声明一旦我结束应用程序会发生什么(听起来像他说我应该在应用程序被要求销毁时清除我的数组列表)。 我目前主要感兴趣的是没有得到aoo运行,但更好地理解为什么我的arraylist是空的,当我试图重新打开它。我无法理解我的手机正在做什么哈哈 –
看来错误在于您的coinsOverTime数组为空。当您的活动以将数组存储为额外的意图开始时,它工作正常,但是当您的应用程序正在关闭屏幕并返回时,情况并非如此。
当您按下home时,您的活动应保存其状态并在屏幕上恢复。 请阅读保存和恢复活动状态节在这里: https://developer.android.com/guide/components/activities/activity-lifecycle.html
让我们解决您的问题的最简单方法是分享您的日志猫。 –
您可以在左侧屏幕底部的栏中点击_Android Monitor_,以查看logcat – Sunshinator
谢谢Sunshinator指引我找到logcat的正确方向。我已经把它贴在上面了! –