Android 无法在StartActivityForResult方法内输入字符串值

我正在传递位置以开始结果方法的活动。place是一个字符串，声明为stringplace

Intent intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/*");
intent.putExtra("location",place);
startActivityForResult(intent, RESULT_TRUE);

在result的start activity中，我尝试使用这两种方法检索它的值，但都不起作用

final String place = data.getStringExtra("location");
final String place = data.getExtras().getString("location");

这就是这个方法的样子

 public  void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == RESULT_TRUE && resultCode == RESULT_OK) {
            Uri url = data.getData();
            final String place = data.getStringExtra("location");
            StorageReference filepath = mstorage.child("photos").child(url.getLastPathSegment());
            filepath.putFile(url).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                @O

activityresult上的公共void（int-requestCode、int-resultCode、Intent-data）{
super.onActivityResult（请求代码、结果代码、数据）；
if（requestCode==RESULT\u TRUE&&resultCode==RESULT\u OK）{
Uri url=data.getData（）；
最终字符串位置=data.getStringExtra（“位置”）；
StorageReference文件路径=mstorage.child（“照片”）.child（url.getLastPathSegment（））；
filepath.putFile（url）.addOnSuccessListener（新的OnSuccessListener（）{
@O

您可以在该

活动中声明一个
全局变量
，并指定要传递给
onActivityResult（）的特定值。
如果您全局声明该值，则可以轻松访问该值，如下所示：

String PLACE;
...
....

        Intent intent = new Intent(Intent.ACTION_PICK);
        intent.setType("image/*");
        PLACE = place;
        //intent.putExtra("location",place);
        startActivityForResult(intent, RESULT_TRUE);

在这种情况下，每次单击按钮的位置值将不同：

public class MyActivity extends AppCompatActivity {

String PLACE;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.xx);



    Btn1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(Intent.ACTION_PICK);
            intent.setType("image/*");
            PLACE = place;
            //intent.putExtra("location",place);
            startActivityForResult(intent, RESULT_TRUE);
        }
    });

    Btn2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(Intent.ACTION_PICK);
            intent.setType("image/*");
            PLACE = place;
            //intent.putExtra("location",place);
            startActivityForResult(intent, RESULT_TRUE);
        }
    });

    Btn3.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
           Intent intent = new Intent(Intent.ACTION_PICK);
            intent.setType("image/*");
            PLACE = place;
            //intent.putExtra("location",place);
            startActivityForResult(intent, RESULT_TRUE);
        }
    });


}

}
您正在尝试获取
最终字符串place=data.getStringExtra（“位置”）；
但数据不包含名为“location”的键，因为没有人设置它

它只在你打开画廊时设置，而不是反过来设置

Intent intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/*");
intent.putExtra("location",place);
startActivityForResult(intent, RESULT_TRUE);

顺便说一句，您已经知道位置值是活动本身，为什么不使用它！
您似乎还没有正确理解该概念！这可能有助于您理解startActivityForResult。然后在解释后查看下面的答案

通过使用
startActivityForResult（Intent-Intent，int-requestCode）
您可以启动另一个活动，然后在
onActivityResult（）
方法中从该活动接收结果。因此
onActivityResult（）
是从您启动另一个活动的地方开始的

示例

 public class MainActivity extends Activity {

        // Use a unique request code for each use case 
        private static final int REQUEST_CODE_EXAMPLE = 0x9988; 

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            // Create an Intent to start AnotherActivity
            final Intent intent = new Intent(this, AnotherActivity.class);

            // Start AnotherActivity with the request code
            startActivityForResult(intent, REQUEST_CODE_EXAMPLE);
        }

        //-------- When a result is returned from another Activity onActivityResult is called.--------- //
        @Override
        public void onActivityResult(int requestCode, int resultCode, Intent data) {
            super.onActivityResult(requestCode, resultCode, data);

            // First we need to check if the requestCode matches the one we used.
            if(requestCode == REQUEST_CODE_EXAMPLE) {

                // The resultCode is set by the AnotherActivity
                // By convention RESULT_OK means that what ever
                // AnotherActivity did was successful
                if(resultCode == Activity.RESULT_OK) {
                    // Get the result from the returned Intent
                    final String result = data.getStringExtra(AnotherActivity.EXTRA_DATA);

                    // Use the data - in this case, display it in a Toast.
                    Toast.makeText(this, "Result: " + result, Toast.LENGTH_LONG).show();
                } else {
                    // AnotherActivity was not successful. No data to retrieve.
                }
            }
        }
    }

AnotherActivity
您正在将该值放入要启动的
活动的意图中。因此，您只能在该新活动中获取该值。如果您希望在当前活动中获取该值，则只需维护一个全局变量，然后单击按钮即可相应地更新其值。
尝试以下操作：-

片段：-

View v;
public static String Place;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    v = inflater.inflate(R.layout.yourLayout, container, false);
    return v;
}

@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

//Initialize your buttons

 btn1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Place=yourPlace;
            Intent intent = new Intent(Intent.ACTION_PICK);
            intent.setType("image/*");
            startActivityForResult(intent, your_Request_code);
        }
    });

 btn2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Place=yourPlace;
            Intent intent = new Intent(Intent.ACTION_PICK);
            intent.setType("image/*");
            startActivityForResult(intent, your_Request_code);
        }
    });

 btn3.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Place=yourPlace;
            Intent intent = new Intent(Intent.ACTION_PICK);
            intent.setType("image/*");
            startActivityForResult(intent, your_Request_code);
        }
    });

}

在活动中：-

String str_place;

@Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == REQUEST_CODE_EXAMPLE) {
            if(resultCode == Activity.RESULT_OK) {          
               str_place=yourFragment.Place;
               //Do your stuff here and use this place object where you want
            } else {

            }
        }
    }

希望这对您有所帮助：-）：-）
放置是对象还是字符串？放置是字符串在ActivityResult中获取的意图数据是不同的当您在同一活动中有位置时，为什么要传递该位置。通过使用startActivityForResult（intent-intent，int-requestCode）您可以启动另一个活动，然后在onActivityResult（）中接收该活动的结果方法。您需要它还是需要将数据发送到另一个活动？buttonA有位置1 buttonB有位置2 buttonC有位置3我想为每个按钮的结果调用活动，并且必须传递位置值这不起作用，因为每个按钮的位置值不同buttonA的位置值是image1，place VabuttonB的lue是image2。我从这些按钮调用onActvitystartMethod，因此我想根据单击的按钮向onActivity方法发送不同的位置值。我从您的代码中得到的是，您试图从应用程序中打开gallery，并使用“位置”键将数据传递给它对吗？选择图像时，将设置结果（图像位置和其他所需数据）调用OnActivityResult方法将在同一活动中调用！哦，我明白了，谢谢。我将删除onActivity开始方法..明天将尝试此方法并更新您。太晚了..谢谢&很好night@user7327850如果您正在使用片段，请在其父级的活动类中使用此
gatherResults
，而不是在片段中
 public  void gatherResults(View view){
        // Perform action on click
        switch(view.getId()) {
            case R.id.button_id_one:
                //DO what you want for specific id button_id_one

                break;
            case R.id.button_id_two:
                //DO what you want specific id button_id_two
                break;
        }
    }

View v;
public static String Place;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    v = inflater.inflate(R.layout.yourLayout, container, false);
    return v;
}

@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

//Initialize your buttons

 btn1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Place=yourPlace;
            Intent intent = new Intent(Intent.ACTION_PICK);
            intent.setType("image/*");
            startActivityForResult(intent, your_Request_code);
        }
    });

 btn2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Place=yourPlace;
            Intent intent = new Intent(Intent.ACTION_PICK);
            intent.setType("image/*");
            startActivityForResult(intent, your_Request_code);
        }
    });

 btn3.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Place=yourPlace;
            Intent intent = new Intent(Intent.ACTION_PICK);
            intent.setType("image/*");
            startActivityForResult(intent, your_Request_code);
        }
    });

}

String str_place;

@Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == REQUEST_CODE_EXAMPLE) {
            if(resultCode == Activity.RESULT_OK) {          
               str_place=yourFragment.Place;
               //Do your stuff here and use this place object where you want
            } else {

            }
        }
    }