java - 将字符串或变量从对话框传递到 Android Activity

Question

我想从对话框中隐式传递两个字符串或变量以供另一个 Activity 使用，同时打开该 Activity 。

对话框

String city = addresses.get(0).getLocality();
String category = "Hazard";

            AlertDialog.Builder prompt = new  
             AlertDialog.Builder(MapsActivity.this);
            prompt.setCancelable(false)
                    .setPositiveButton("Mineralization", new 
             DialogInterface.OnClickListener() {

                    .setPositivetiveButton("Geohazard", new 
                           DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, 
                                int which) {

                                    startActivity(new  
                        Intent(getApplicationContext(),MapsActivity.class));

                        //i want to pass the String city and category here
                                }
                            }
                    )





            AlertDialog alert = prompt.create();
            alert.setTitle("Please select an option");
            alert.show();

            TextView myTextView = (TextView) findViewById(R.id.PSString);
            myTextView.setText(city);

新 Activity

package com.example.boneyflesh.homepage;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class GeohazardResults extends AppCompatActivity {

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

我该怎么做？我应该在 onClickListener 上写什么以及在新 Activity 上做什么才能获取字符串？

Answer 1

不要在 onClick 方法中执行类似的操作

startActivity(new Intent(getApplicationContext(),MapsActivity.class));

您可以通过 Intent 将两个字符串传递给 onClick 方法内的 MapsActivity ，如下所示

Intent lIntent = new Intent(getApplicationContext(), MapsActivity.class);
lIntent.putExtra("city", city);
lIntent.putExtra("category", category);
startActivity(lIntent);

并在MapsActivity中检索这些值，如下所示

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_geohazard_results);
    String city = getIntent().getStringExtra("city");
    String category = getIntent().getStringExtra("category");
}