Question

如何从fragment向activity传递对象

Answer 1

activity向fragment中传值
1。要传的值 放到Bundle对象里

2。通过创建传递封Fragment 将bundle对象 通过 setArguments（）传递到fragment

3.Fragment中 通过getArguments() 得到 bundle对象 就能得到里面的值

代码：

MainActivity:

[java] view plain copy print?
package com.qianfeng.activitytofragment;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

@SuppressLint("NewApi")
public class MainActivity extends Activity {

private EditText et1;
private FragmentManager manager;
private FragmentTransaction transaction;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

et1 = (EditText) findViewById(R.id.et1);

manager = getFragmentManager();
transaction = manager.beginTransaction();

transaction.add(R.id.contents, new Fragment1());
transaction.commit();

}

//点击按钮时 进行传值
public void onclickBtn(View v){
switch (v.getId()) {
case R.id.button1:
Fragment1 fragment1 = new Fragment1();
Bundle bundle = new Bundle();
String strValue = et1.getText().toString().trim();
bundle.putString("str", strValue);
fragment1.setArguments(bundle);
//如果transaction commit（）过 那么我们要重新得到transaction
transaction = manager.beginTransaction();
transaction.replace(R.id.contents, fragment1);
transaction.commit();
break;

default:
break;
}
}

}

Fragment :

[java] view plain copy print?
package com.qianfeng.activitytofragment;

import android.annotation.SuppressLint;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

@SuppressLint("NewApi")
public class Fragment1 extends Fragment{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view = inflater.inflate(R.layout.fragment_layout1, container, false);
TextView textView1 = (TextView) view.findViewById(R.id.textView1);
Bundle bundle = getArguments();//从activity传过来的Bundle
if(bundle!=null){
textView1.setText(bundle.getString("str"));
}

return view;
}
}