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/