我有3个活动，A，B和C.活动流程从A到C，然后再次返回图像和从C到A的值。所有返回的值和图像都将加载到listView A。
listView是可点击的，一旦点击，它将intent到B进行某些版本。但现在的问题是当我在B中编辑文本值并返回到A时，editText值仍然保持不变。
这里有什么问题？有人可以帮忙吗？
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
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) { //receive value from B
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.add(Text);
listV.setAdapter(adapter);
adapter.notifyDataSetChanged();
break;
}
listV.setOnItemClickListener(new AdapterView.OnItemClickListener() { // listview intent to B
public void onItemClick(AdapterView<?> listView, View view,
int position, long id) {
if(name.equals("Project")) {
Intent intent = new Intent(B.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: // activity start from here by clicking icon
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 Claims");
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);
}
被修改
删除k值并在startActivityForResult中使用startActvity代替Activity A后，我的问题仍未解决，因为它创建了新的listView而不是编辑旧的。
答案 0 :(得分：1)
要处理来自ActivityB的回调，您应该使用startActivityForResult()代替startActivity()开始活动
更改您的代码：
if(name.equals("Project")) {
Intent intent = new Intent(this.ActivityA, B.class);
intent.putExtra("k",k);
intent.putExtra("bitmap",true);
intent.putExtra("name",name);
intent.putExtra("result",result);
startActivityForResult(intent, 0); // here "0" because you choose "0" as requestcode in your onActivityResult() method
}