onActivityResult在android中的用法
举例说我想要做的一个事情是，在一个主界面(主Activity)上能连接往许多不同子功能模块(子Activity上去)，当子模块的事情做完之后就回到主界面，或许还同时返回一些子模块完成的数据交给主Activity处理。这个时候就要用到回调函数onActivityResult()。
现在贴上一个关于onActivityResult的用法的小例子的代码：
onActivityResult.java
主要的Activity，一会会先执行此Activity，然后调用B Activity，并向其发送数据，通过回调函数来获取B传回来的值。
public class onActivityResult extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
StartA();
}
public void StartA()
{
Button buttonA = (Button)findViewById(R.id.button1);
buttonA.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
// onActivityResult.this.setContentView(R.layout.second);
// onActivityResult.this.StartB();
Intent intent = new Intent(onActivityResult.this,ClassB.class);
String passString = "Hello,this is A";
intent.putExtra("ToB", passString);
startActivityForResult(intent, 0);
}
});
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (resultCode) { //resultCode为回传的标记，我在B中回传的是RESULT_OK
case RESULT_OK:
Bundle b=data.getExtras(); //data为B中回传的Intent
String str=b.getString("FromB");//str即为回传的值
TextView view = (TextView)findViewById(R.id.textA);
view.setText(str);
break;
default:
break;
}
}
/*public void StartB()
{
Button buttonB = (Button)findViewById(R.id.button2);
buttonB.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
onActivityResult.this.setContentView(R.layout.main);
onActivityResult.this.StartA();
}
});
}*/
}
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ClassB.java
public class ClassB extends Activity{
private Intent intent;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
intent = getIntent();
String result = intent.getStringExtra("ToB");
Button button = (Button)findViewById(R.id.button2);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(ClassB.this,onActivityResult.class);
String passString = "Hello,this is B";
intent.putExtra("FromB", passString);
setResult(RESULT_OK, intent);
finish();
}
});
TextView textView = (TextView)findViewById(R.id.textB);
textView.setText(result);
}
}
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