正在开发一个我拥有的Android应用程序

我有两个类(class)A和类(class)B。

在A类中,我尝试了如下代码段,

如何从Activity调用另一个Activity中的方法。

public class FirstActivity extends Activity {

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main2);
    }

    public void method() {
        // some code
    }
}

public class SecondActivity extends Activity {

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
         setContentView(R.layout.main2);

        FirstActivity fact = new FIrstActivity();

        fact.method();
    }
}

最佳答案

startActivityForResult模式更适合您要实现的目标:http://developer.android.com/reference/android/app/Activity.html#StartingActivities

尝试下面的代码

public class MainActivity extends Activity {

    Button button1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView1=(TextView)findViewById(R.id.textView1);
        button1=(Button)findViewById(R.id.button1);
        button1.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View arg0) {
                Intent intent=new Intent(MainActivity.this,SecondActivity.class);
                startActivityForResult(intent, 2);// Activity is started with requestCode 2
            }
        });
    }
 // Call Back method  to get the Message form other Activity
    @Override
       protected void onActivityResult(int requestCode, int resultCode, Intent data)
       {
                 super.onActivityResult(requestCode, resultCode, data);
                  // check if the request code is same as what is passed  here it is 2
                   if(requestCode==2)
                         {
                          //do the things u wanted
                         }
     }

}

SecondActivity.class
public class SecondActivity extends Activity {

    Button button1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);

            button1=(Button)findViewById(R.id.button1);
            button1.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View arg0) {
                    String message="hello ";
                    Intent intent=new Intent();
                    intent.putExtra("MESSAGE",message);
                    setResult(2,intent);
                    finish();//finishing activity
                }
            });
    }

}

让我知道是否有帮助...

关于android - 如何从Activity调用另一个Activity中的方法,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/19666572/

10-12 00:31
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