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對於通過Android進行編碼並不瞭解Java的新手來說。我一直在通過發佈的其他問題放在一起，但我很掙扎。 我在我的OnCreate方法的頂部創建了一個名爲'images2'的數組，並將一堆顏色從我的drawable中逐一放入。這部分工作很好，但我一直在試圖創建一個onClickListner，它有一個OnClick方法，當你點擊它到另一種顏色時，它會改變drawable。我希望他們都變成相同的顏色。我知道我可以通過編程設置選擇器：gridview2.setSelector（new ColorDrawable（Color.BLACK））;但是改變選擇器，無論是在後端還是XMl代碼都無法幫助我獲得新的可繪製對象。所以我在適配器中創建了另一個listArray，我可以在main中調用它。我在onClick中有一個索引，它會遍歷所有25個可能的項目位置，並且我想使它能夠將drawable更改爲數組中的每個位置。它還將當前位置添加到數組myarray.add（position）;但我意識到價值可能不會被保存。 arrayList被聲明爲public，但它在適配器中聲明爲public，因此OnCreate中的更改沒有任何影響？對不起。這絕對是一個noobinoob-noob問題。允許用戶在GridView中選擇多個項目
/**
* Created by Jordan on 3/25/2017.
*/
public class Welcome extends AppCompatActivity implements AdapterView.OnItemClickListener {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.welcome);
final List<Integer> images2 = new ArrayList<Integer>();
images2.add(R.drawable.grid1);images2.add(R.drawable.grid6);
images2.add(R.drawable.grid2);images2.add(R.drawable.grid2);
images2.add(R.drawable.grid3);images2.add(R.drawable.grid1);
images2.add(R.drawable.grid4);images2.add(R.drawable.grid3);
images2.add(R.drawable.grid5);images2.add(R.drawable.grid2);
images2.add(R.drawable.grid6);images2.add(R.drawable.grid6);
images2.add(R.drawable.open);images2.add(R.drawable.grid4);
images2.add(R.drawable.grid1);images2.add(R.drawable.grid1);
images2.add(R.drawable.grid6);images2.add(R.drawable.grid4);
images2.add(R.drawable.grid4);images2.add(R.drawable.grid2);
images2.add(R.drawable.grid3);images2.add(R.drawable.grid3);
images2.add(R.drawable.grid6);images2.add(R.drawable.grid1);
images2.add(R.drawable.grid5);
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
final GridView gridview2 = (GridView) findViewById(R.id.welcomeGrid);
final Welcome.ImageAdapter mAdapter = new Welcome.ImageAdapter(this, images2);
gridview2.setAdapter(mAdapter);
gridview2.setChoiceMode(GridView.CHOICE_MODE_MULTIPLE);
gridview2.setItemChecked(2, true);
gridview2.setOnItemClickListener(this);
gridview2.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
// ArrayList<Integer> clickedStatus = new ArrayList<Integer>();
ArrayList<Integer> clickedStatus = new ArrayList<>(25);
clickedStatus.add(position);
if (position == 12){
setContentView(R.layout.login);
}
else if(position != 12) {
// no matter, whether the item has already been clicked or not I want this toast to pop up to promp the user to actually enter the app and sign in
Toast.makeText(Welcome.this, "You selected " + position+ ".. Please select middle tile to enter!",
Toast.LENGTH_SHORT).show();
if(clickedStatus.contains(position)){
// as soon as it's noticed that the an integer matching the current position is currently stored in the
// array list (clickedStatus), I want it removed right below
// was passing item in place of position into the remove(). Don't know why Integer item = (Integer) parent.getItemAtPosition(position);
//I want to go through 25 numbers and
for(int i=0; i<25;i++){
// compare those ints to what is in contained in the clickedstatus
if(clickedStatus.contains(i)){
// Drawable Marker = getResources().getDrawable(R.drawable.celeb1);
images2.set(i, R.drawable.celeb1);
//for every int that is stored in click status I want
// to call the item and change the background of that item to a specified drawable file.
}
}
}
else {
clickedStatus.add(position);
// images2.set(position,);
for(int i=1; i<25;i++){
// compare those ints to what is in contained in the clickedstatus
if(clickedStatus.contains(i)){
// Drawable Marker = getResources().getDrawable(R.drawable.celeb1);
images2.set(i, R.drawable.celeb1);
//for every int that is stored in click status I want
// to call the item and change the background of that item to a specified drawable file.
}
}
}
// gridview2.setSelector(new ColorDrawable(Color.BLACK));
// mAdapter.notifyDataSetChanged();
}
}
}
);
}
// I think this got generated automatically at some point somehow. Might of been with the multichoicemode line above^
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
}
public class ImageAdapter extends BaseAdapter {
private Context mContext;
//IMAGES ARE REFERENCED HERE V---
private List<Integer> mImages2;
public ArrayList<Integer> clickedStatus = new ArrayList<Integer>();
//create array to store whether an item has been clicked or not. needs to be public!!
//check to determine the case in the below method
// IGNORE THIS
// private int selectedPosition = -1;
//public void setSelectedPosition(int position) {
// selectedPosition = position;
//}
public ImageAdapter(final Context c, final List<Integer> images2){
mContext = c;
mImages2 = images2;
}
public int getCount() {
return mImages2.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return 1;
}
// create a new ImageView for each item referenced by the Adapter
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) {
// if it's not recycled, initialize some attributes
imageView = new ImageView(mContext);
imageView.setLayoutParams(new GridView.LayoutParams(140, 120));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(0, 0, 0, 0);
} else {
imageView = (ImageView) convertView;
}
if(clickedStatus.contains(position)){
convertView.setSelected(true);
convertView.setPressed(true);
convertView.setBackgroundColor(Color.GREEN);
}
imageView.setImageResource(mImages2.get(position));
return imageView;
}
;}
}
對不起。我知道我在那裏的代碼有一個絕對的混亂，但我是一個多任務試圖一次做幾件事情。我曾經有過15+個標籤可以一次睜開眼睛，讓我的臉看起來更容易。請儘管幫忙。這是我的MSIS學士學位項目的最後一個項目，我的團隊基本上已經把所有的事情從頭到腳留給了我！ –
我真的很想盡量保持儘可能多的機會（披露那些什麼都不做的事情），但是如果我因爲強烈的直接回答而需要進行徹底改革，我也會因此而失望。我現在還在研究它，所以不要以爲我只是把它放在神的詭計中！我工作了很多，但我會休息幾天，這可能真的有助於本週。 –