适配器类中的super.onActivityResult吗?安卓 [英] super.onActivityResult inside adapter class? Android
问题描述
我有非常复杂的项目，多个按钮/图像/文本的RecyclerView. 要访问每个按钮/图像，请在Adapter类中设置单击监听器.
I have RecyclerView with very complex item, multiple buttons/images/texts. To access each button/image I set my click Listeners inside my Adapter class.
但是现在我正在尝试添加功能来设置联系人铃声，但是我遇到了问题.
But now I am trying add function to set contact ringtone and I have a problem.
我正在这样调用onActivityResult方法:
I am calling the onActivityResult method like this:
Intent contactIntent = new Intent(Intent.ACTION_PICK);
contactIntent.setType(ContactsContract.Contacts.CONTENT_TYPE);
contactIntent.putExtra("ITEM_POSITION", position);
((Activity) context).startActivityForResult(contactIntent, CONTACT_CHOOSER_ACTIVITY_CODE );
，效果很好. 但这是问题所在:
and that works fine. But here is the problem:
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
....
...
...
}
}
我收到此错误:Cannot resolve method 'onActivityResult(int, int, android.content.Intent)'
有什么办法可以避免这种情况?还是可以在适配器类中使用此方法?如果没有，我该怎么办?
I get this error: Cannot resolve method 'onActivityResult(int, int, android.content.Intent)'
Is there any way to avoid this? or is it possible to have this method inside adapter class? If not what should I do?
推荐答案
您不能在任何Adapter类中使用它，这只是Activity中的一个方法，每个extends Activity都可以重写此方法的类，但是当然不是适配器.
You cannot have this in any Adapter class, this is only a method inside Activity, each class that extends Activity will be able to Override this method but certainly not an Adapter.
请参见 Java中的替代
对于onActivityResult，请参见 Activity#onActivityResult(int，int，Intent)
对于RecyclerView.Adapter之类的东西，您将要在适配器中定义一个接口，并在Activity中实现该接口.
For something like a RecyclerView.Adapter you are going to want to define an interface in your adapter and implement that interface in your Activity.
例如，以下是应用程序的代码，该应用程序将单击的项目的字符串及其位置发送到显示该项目的新活动:
For example here is code for an application that sends a String of the Item clicked and its position to a new Activity which displays it:
MainActivity:
MainActivity:
public class MainActivity extends AppCompatActivity implements MyAdapter.CallbackInterface {
private static final int MY_REQUEST = 1001;
private static final String [] ITEMS = {"Item 1", "Item 2", "Item 3" ,"Item 4", "Item 5", "Item 6"};
private MyAdapter myAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// ... Adapter setup, simple LinearLayoutManager and String [] used
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.rec_view);
myAdapter = new MyAdapter(this, ITEMS);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(myAdapter);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch(resultCode){
case RESULT_OK:
// ... Check for some data from the intent
if(requestCode == MY_REQUEST){
// .. lets toast again
int position = -1;
if(data != null){
position = data.getIntExtra("Position", 0);
}
if(position != -1) {
Toast.makeText(this, "Handled the result successfully at position " + position, Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(this, "Failed to get data from intent" , Toast.LENGTH_SHORT).show();
}
}
break;
case RESULT_CANCELED:
// ... Handle this situation
break;
}
}
/**
* Interface Method which communicates to the Acitivty here from the {@link MyAdapter}
* @param position - the position
* @param text - the text to pass back
*/
@Override
public void onHandleSelection(int position, String text) {
Toast.makeText(this, "Selected item in list "+ position + " with text "+ text, Toast.LENGTH_SHORT).show();
// ... Start a new Activity here and pass the values
Intent secondActivity = new Intent(MainActivity.this, DetailActivity.class);
secondActivity.putExtra("Text",text);
secondActivity.putExtra("Position", position);
startActivityForResult(secondActivity, MY_REQUEST);
}
}
MainActivity的xml:
xml for MainActivity:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.divshark.recyclerviewsimpledemo.MainActivity">
<android.support.v7.widget.RecyclerView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/rec_view" />
</RelativeLayout>
MyAdapter:
MyAdapter:
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyHolder>{
private CallbackInterface mCallback;
private String [] mMyItems;
private Context mContext;
public interface CallbackInterface{
/**
* Callback invoked when clicked
* @param position - the position
* @param text - the text to pass back
*/
void onHandleSelection(int position, String text);
}
public MyAdapter(Context context, String [] myItems){
mContext = context;
mMyItems = myItems;
// .. Attach the interface
try{
mCallback = (CallbackInterface) context;
}catch(ClassCastException ex){
//.. should log the error or throw and exception
Log.e("MyAdapter","Must implement the CallbackInterface in the Activity", ex);
}
}
@Override
public int getItemCount() {
return mMyItems.length;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public void onBindViewHolder(MyHolder holder, final int position) {
// Set the text for the View
holder.mTextView.setText(mMyItems[position]);
// Use your listener to pass back the data
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(mCallback != null){
mCallback.onHandleSelection(position, mMyItems[position]);
}
}
});
}
@Override
public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(mContext).inflate(R.layout.list_item, parent, false);
return new MyHolder(view);
}
static class MyHolder extends RecyclerView.ViewHolder{
TextView mTextView;
public MyHolder(View itemView) {
super(itemView);
mTextView = (TextView) itemView.findViewById(R.id.tv_list_item);
}
}
}
适配器的布局:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="?listPreferredItemHeight">
<TextView
android:id="@+id/tv_list_item"
android:textColor="@android:color/black"
tools:text="Some Text Holder"
android:layout_marginLeft="16dp"
android:textSize="18sp"
android:layout_centerVertical="true"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
和DetailActivity:
and the DetailActivity:
public class DetailActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.detail_activity);
TextView textView = (TextView) findViewById(R.id.tv_detail_text);
if(getIntent() != null && getIntent().getExtras() != null) {
Bundle extras = getIntent().getExtras();
String text = extras.getString("Text");
int position = extras.getInt("Position");
textView.setText(String.format("%s at position %d", text, position));
// .. For this purpose set result okay and use position as part of data when Activity finishes
// Which will in turn invoke the onActivityResult method in the calling activity
Intent resultIntent = new Intent();
resultIntent.putExtra("Position", position);
setResult(RESULT_OK, resultIntent);
}
}
}
详细信息活动的布局:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<TextView
android:id="@+id/tv_detail_text"
android:layout_gravity="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</FrameLayout>
祝你好运，编码愉快！
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