如何在 listView 中更新和添加新列表？
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【中文标题】如何在 listView 中更新和添加新列表？【英文标题】：How to update and add a new list in listView? 【发布时间】：2016-02-17 21:51:14 【问题描述】：在我的活动 A 中，它有一个图标 button 和一个 listView。图标button 用于intent 到B 和C，而listView 用于intent B 进行一些编辑。
我有 3 个活动，A，B 和 C。活动的流程是从 A 到 B，然后是 C。从 C，所有图像和值将返回到 B，然后 A。所有返回的值和图像将是加载在listViewA.
现在我想要实现的是将所有从 C 和 B 获取的值加载到 A。接下来，可以在单击 listView 时更新列表。
活动 C
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.image_fit_screen);
selectImage();
b = (ImageView) findViewById(R.id.imageView3);
t = (EditText) findViewById(R.id.editText38);
cancel=(Button)findViewById(R.id.button15);
ok=(Button)findViewById(R.id.button16);
cancel.setOnClickListener(new View.OnClickListener()
public void onClick(View arg0)
finish();
);
ok.setOnClickListener(new View.OnClickListener()
// return to B
public void onClick(View arg0)
Intent returnIntent=new Intent();
text=t.getText().toString();
b.setDrawingCacheEnabled(true);
b.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
b.layout(0, 0, b.getMeasuredWidth(), b.getMeasuredHeight());
b.buildDrawingCache(true);
returnIntent.putExtra("text", text);
if (b.getDrawingCache() != null)
Bitmap bitmap = Bitmap.createBitmap(b.getDrawingCache());
if (bitmap == null)
Log.e("TAG", "getDrawingCache() == null");
Global.img = bitmap;
setResult(Activity.RESULT_OK, returnIntent);
finish();
);
活动 B
ImageButton imageButton;
ImageView viewImage;
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.project);
txt = (EditText) findViewById(R.id.editText36);
txt1=(TextView)findViewById(R.id.textView57);
Button b = (Button) findViewById(R.id.button17);
addListenerOnButton();
viewImage = (ImageView) findViewById(R.id.imageView2);
if(getIntent().getExtras()!=null) //if has value pass from A
final String Amount = getIntent().getExtras().getString("result");
final String description1 = getIntent().getExtras().getString("description");
txt1.setText(description1);
txt.setText(Amount);
b.setOnClickListener(new View.OnClickListener() // return to A
public void onClick(View arg0)
Intent returnIntent = new Intent();
a = "Project";
text = txt.getText().toString(); // amount
returnIntent.putExtra("text", text);
returnIntent.putExtra("a", a);
returnIntent.putExtra("c", c);
setResult(Activity.RESULT_OK, returnIntent);
finish();
);
viewImage.setImageBitmap(Global.img);
public void addListenerOnButton()
imageButton = (ImageButton) findViewById(R.id.imageButton);
imageButton.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View arg0)
Global.img=null;
Intent i = new Intent(B.this,C.class);
startActivityForResult(i, PROJECT_REQUEST_CODE);
);
public void onActivityResult(int requestCode,int resultCode, Intent data)
if(requestCode==PROJECT_REQUEST_CODE) // receive fom C
if(data!=null&&data.hasExtra("text"))
c = data.getStringExtra("text");
txt1.setText(c);
viewImage.setImageBitmap(Global.img); // image from C can be shown here
else if (requestCode==CAMERA_REQUEST_CODE)
活动 A
public class Claims1 extends Fragment
private int mClickedPosition;
ListView listV;
TextView c;
ImageView v;
ArrayAdapter<String> adapter;
ArrayList<String> m_listItems = new ArrayList<String>();
String Text;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
super.onCreate(savedInstanceState);
Bundle bundle = this.getArguments();
setHasOptionsMenu(true);
View claims = inflater.inflate(R.layout.receipt_text, container, false);
v=(ImageView)claims.findViewById(R.id.imageView4);
listV = (ListView) claims.findViewById(R.id.listView1);
android.support.v7.app.ActionBar myActionBar = ((AppCompatActivity) getActivity()).getSupportActionBar();
myActionBar.setHomeButtonEnabled(true);
ImageView imageView = new ImageView(myActionBar.getThemedContext());
imageView.setScaleType(ImageView.ScaleType.CENTER);
imageView.setImageResource(R.mipmap.create);
adapter=new ArrayAdapter<String>(getActivity(),R.layout.claims,R.id.textView1,m_listItems);
android.support.v7.app.ActionBar.LayoutParams layoutParams = new android.support.v7.app.ActionBar.LayoutParams(
android.support.v7.app.ActionBar.LayoutParams.WRAP_CONTENT,
android.support.v7.app.ActionBar.LayoutParams.WRAP_CONTENT, Gravity.RIGHT
| Gravity.CENTER_VERTICAL); // for icon in action bar
layoutParams.rightMargin = 40;
imageView.setLayoutParams(layoutParams);
myActionBar.setCustomView(imageView);
listV.setOnItemClickListener(new AdapterView.OnItemClickListener()
mClickedPosition = position;
public void onItemClick(AdapterView<?> listView, View view,
int position, long id)
if(name.equals("Project"))
Intent intent = new Intent(Claims1.this.getActivity(), B.class);
intent.putExtra("bitmap",true);
intent.putExtra("name",name);
intent.putExtra("result",result);
startActivityForResult(intent,0);
);
return claims;
@Override
public boolean onOptionsItemSelected(MenuItem item)
switch (item.getItemId())
case R.id.create1: // icon is clicked
AlertDialogRadio();
return true;
return (super.onOptionsItemSelected(item));
public void AlertDialogRadio()
final CharSequence[] ClaimsModel = "B", "Petrol";
AlertDialog.Builder alt_bld = new AlertDialog.Builder(getActivity());
alt_bld.setTitle("Select a Class");
alt_bld.setSingleChoiceItems(ClaimsModel, -1, new DialogInterface
.OnClickListener()
public void onClick(DialogInterface dialog, int item)
if (item == 0)
Intent intent = new Intent(getActivity().getApplicationContext(),B.class);
startActivityForResult(intent, 0);
else if (item == 1)
Intent intent = new Intent(getActivity().getApplicationContext(), Petrol.class);
startActivityForResult(intent, 1);
dialog.dismiss();
);
AlertDialog alert = alt_bld.create();
alert.show();
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data)
switch (requestCode)
case 0:
result = data.getStringExtra("text");
name = data.getStringExtra("a");
description = data.getStringExtra("c");
as = Long.parseLong(result);
Log.d("FIRST", "result:"+result);
Text=" "+name+" "+"RM"+result+"";
if (m_listItems.size() == 0)
m_listItems.add(Text);
else
m_listItems.set(mClickedPosition,Text);
adapter.notifyDataSetChanged();
listV.setAdapter(adapter);
break;
但是现在，当我单击图标 button 以意图类 B 和 C 并将值从 C 和 B 返回到 A 时，它只会更新 listView 而不是创建一个新的。为什么会这样？
【问题讨论】：
在下面查看我的答案。添加了一个名为 setAdapter() 的方法；确保替换您的 onCreateView() 和 onActivityResult() 并添加 setAdapter() 究竟什么是无法解决的？为我复制并粘贴该行。 【参考方案1】：检查我的编辑
public class Claims1 extends Fragment
private int mClickedPosition;
ListView listV;
TextView c;
ImageView v;
ArrayAdapter<String> adapter;
ArrayList<String> m_listItems = new ArrayList<String>();
String Text;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
super.onCreate(savedInstanceState);
Bundle bundle = this.getArguments();
setHasOptionsMenu(true);
View claims = inflater.inflate(R.layout.receipt_text, container, false);
v=(ImageView)claims.findViewById(R.id.imageView4);
listV = (ListView) claims.findViewById(R.id.listView1);
android.support.v7.app.ActionBar myActionBar = ((AppCompatActivity) getActivity()).getSupportActionBar();
myActionBar.setHomeButtonEnabled(true);
ImageView imageView = new ImageView(myActionBar.getThemedContext());
imageView.setScaleType(ImageView.ScaleType.CENTER);
imageView.setImageResource(R.mipmap.create);
android.support.v7.app.ActionBar.LayoutParams layoutParams = new android.support.v7.app.ActionBar.LayoutParams(
android.support.v7.app.ActionBar.LayoutParams.WRAP_CONTENT,
android.support.v7.app.ActionBar.LayoutParams.WRAP_CONTENT, Gravity.RIGHT
| Gravity.CENTER_VERTICAL); // for icon in action bar
layoutParams.rightMargin = 40;
imageView.setLayoutParams(layoutParams);
myActionBar.setCustomView(imageView);
setMyAdapter();
return claims;
public void setMyAdapter()
adapter=new ArrayAdapter<String>(getActivity(),R.layout.claims,R.id.textView1,m_listItems);
listV.setAdapter(adapter);
listV.setOnItemClickListener(new AdapterView.OnItemClickListener()
public void onItemClick(AdapterView<?> listView, View view,
int position, long id)
mClickedPosition = position;
if(name.equals("Project"))
Intent intent = new Intent(Claims1.this.getActivity(), B.class);
intent.putExtra("bitmap",true);
intent.putExtra("name",name);
intent.putExtra("result",result);
startActivityForResult(intent,0);
);
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data)
switch (requestCode)
case 0:
result = data.getStringExtra("text");
name = data.getStringExtra("a");
description = data.getStringExtra("c");
as = Long.parseLong(result);
Log.d("FIRST", "result:" + result);
Text = " " + name + " " + "RM" + result + "";
m_listItems.clear();
if (m_listItems.size() == 0)
m_listItems.add(Text);
else
m_listItems.set(mClickedPosition, Text);
setMyAdapter();
break;
【讨论】：
感谢您的回答，但返回值仍在更新旧列表，而不是创建新列表 @John 嗯，如果你想要一个新的列表来解决问题，那么文本至少会改变吗？你这样做的方式将很难改变比文本更多的东西。 我只更改了文本...我也想添加新列表 我迷路了，它基本上是一个新列表，一切都被清除了 我想我已经修复了一分钟我正在做一个大编辑以上是关于如何在 listView 中更新和添加新列表？的主要内容，如果未能解决你的问题，请参考以下文章
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