标签：alt name res xtend tac ide 通过 efault void
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。这样的数据交流就要用到回调函数onActivityResult()。
public class MainActivity extends Activity {
public final int REQUESTCODE_FROM_MAIN_TO_OTHER = 1;
public final int REQUESTCODE_FROM_MAIN_TO_PEPELU = 2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn_start_other = (Button) findViewById(R.id.btn_start_other);
btn_start_other.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setClass(MainActivity.this, OtherActivity.class);
// 如果REQUESTCODE_MAIN> =0,当Activity结束时requestCode将归还在onActivityResult()中。
//以便确定返回的数据是从哪个Activity中返回
startActivityForResult(intent, REQUESTCODE_FROM_MAIN_TO_OTHER);
}
});
Button btn_start_pepelu = (Button) findViewById(R.id.btn_start_pepelu);
btn_start_pepelu.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setClass(MainActivity.this, PepeluActivity.class);
startActivityForResult(intent, REQUESTCODE_FROM_MAIN_TO_PEPELU);
}
});
}
/**
* requestCode和startActivityForResult中的requestCode相对应
* resultCode和Intent是由子Activity通过其setResult()方法返回
*/
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case REQUESTCODE_FROM_MAIN_TO_OTHER:
if (resultCode == Activity.RESULT_OK) {
Toast.makeText(this, data.getStringExtra("name"), Toast.LENGTH_LONG).show();
Log.i("onactivityresultdemo", data.getStringExtra("name"));
} else {
Log.i("onactivityresultdemo", "i blabalabal");
}
break;
case REQUESTCODE_FROM_MAIN_TO_PEPELU:
if (resultCode == Activity.RESULT_CANCELED) {
Toast.makeText(this, data.getStringExtra("name"), Toast.LENGTH_LONG).show();
Log.i("onactivityresultdemo", data.getStringExtra("name"));
} else {
Log.i("onactivityresultdemo", "i blabalabal");
}
break;
default:
break;
}
}
}
在OtherActivity中设置返回码和返回数据:
public class OtherActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_other);
Button btn = (Button) findViewById(R.id.btn_other);
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.putExtra("name", "cc");
// 设置返回码和返回携带的数据
setResult(Activity.RESULT_OK, intent);
}
});
}
}
在PepeluActivity中设置返回码和返回数据:
public class PepeluActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pepelu);
Button btn_pepelu=(Button) findViewById(R.id.btn_pepelu);
btn_pepelu.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent();
intent.putExtra("name", "pepelu");
setResult(Activity.RESULT_CANCELED,intent);
}
});
}
}
标签：alt name res xtend tac ide 通过 efault void
原文地址：https://www.cnblogs.com/blogwangwang/p/10496385.html
