java - 如何在android中的Activity之间传递集合

Question

我正在尝试做什么::

• 我正在尝试将集合从一个 Activity 传递到另一个 Activity ，并在日志中显示收到的集合
• 我知道这可以使用 Intent 来实现，所以我正在使用它们

我不能做什么::

• 如何在Screen1.java中接收hashmap并将其显示在日志中

<小时/>

MainActivity.java

public class MainActivity extends Activity implements OnClickListener{

    HashMap<String, String> objColl;
    Button btn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        objColl=new HashMap<String, String>();
        objColl.put("1", "USA");
        objColl.put("2", "Canada");
        objColl.put("3", "Africa");
        objColl.put("4", "England");

        btn=(Button) findViewById(R.id.button1);

        btn.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub

        switch(v.getId())
        {
        case R.id.button1:
            Intent intent=new Intent(MainActivity.this,Screen1.class);
            intent.putExtra("key1", objColl);
            startActivity(intent);
            break;
        }   
    }
}

Screen1.java

public class Screen1 extends Activity {

    HashMap<String, String> objColl;
    TextView txtVw;
    String res;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        txtVw=(TextView) findViewById(R.id.textView1);
    }

    @Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();

    }
}

<小时/>

日志::

Answer 1

发件人 Activity :

HashMap<String, String> hashMap= ....
Intent intent = new Intent(SourceActivity.this, DestinationActivity.class);
intent.putExtra("hashMap", hashMap);
startActivity(intent);

接收者 Activity :

Intent intent = getIntent();    
HashMap<String, String> hashMap = (HashMap<String, String>) intent.getSerializableExtra("hashMap");