我很困惑，不知道如何使用startActivityResults和setResults从以前的活动中获取数据。我有一节观景课和一节活动课。
基本上，在我的视图类中，我有这个对话框，它将实际启动名为colorActivity类的活动类。当用户选择Yes时，它也会将所选圆圈的名称传递给ColorActivity类。在colorActivity类中，允许用户输入特定圆的颜色代码，我想将颜色代码传递回view类。我在使用startActivityForresult和setResult方法将值从活动传递回视图时遇到问题。再加上，之后如何利用获取的数据？
我的代码如下
我的视图类中的ontouchevent代码：
@Override
public boolean onTouchEvent(MotionEvent event) {
x = event.getX();
y = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
for (int i = 0; i < circles.size(); i++) {
if (circles.get(i).contains(x, y)) {
circleID = i;
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
AlertDialog.Builder builder = new Builder(
getContext());
final EditText text = new EditText(getContext());
builder.setTitle("Adding colors to circles").setMessage(
"Proceed to Enter color");
builder.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface di,
int i) {
Intent intent = new Intent(
getContext(),
colorActivity.class);
intent.putExtra("circlename", circleNameList.get(circleID));
startActivityForResults(intent, 1); // error incurred here : The method startActivityForResult(Intent, int) is undefined for the type new DialogInterface.OnClickListener(){}
}
});
builder.setNegativeButton("No",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface di,
int i) {
}
});
builder.create().show();
}
}, 3000);
break;
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 1) { // Please, use a final int instead of hardcoded
// int value
if (resultCode == RESULT_OK) {
ccode = (String) data.getExtras().getString("colorcode");
}
}
}
public static String getColorCode() {
return ccode;
}
在ColorActivity中：
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.add_ecolor);
circlenametextview = (TextView)findViewById(R.id.circlenametextview);
String circlename = super.getIntent().getStringExtra("circlename");
circlenametextview.setText(circlename);//get the circle name
savebutton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Intent intent = new Intent(colorActivity.this, ?????);//how to return back to the view class?
colorcode = colorEditText.getText().toString();// I am able to get value right up till this point
Intent resultIntent = new Intent();
resultIntent.putExtra("colorcode", colorcode );
setResult(Activity.RESULT_OK, resultIntent);
finish();
}// onclick
});
}
最佳答案
在更正其他代码以便运行程序之后，您可以通过以下方式从activitycolorActivity中检索参数：
步骤1：从colorActivity返回一些值
Intent resultIntent = new Intent();
resultIntent.putExtra("NAME OF THE PARAMETER", valueOfParameter);
...
setResult(Activity.RESULT_OK, resultIntent);
finish();
步骤2：从主活动收集数据
覆盖
@onActivityResult(...)。@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 1) { // Please, use a final int instead of hardcoded int value
if (resultCode == RESULT_OK) {
String value = (String) data.getExtras().getString("NAME OF THE PARAMETER");
工具书类
http://developer.android.com/training/basics/intents/result.html
How to manage `startActivityForResult` on Android?
http://steveliles.github.io/returning_a_result_from_an_android_activity.html