[android]startActivityForResult步骤简介

Activity1跳转到Activity2，用startActivity()；如果由Activity1跳转到Activity2，需要再由Activity2回到Activity1呢？

可能有人说：那我在Activity2中再次使用startActivity()不就可以了，是的，但是startActivityForResult()能够直接完成这项工作

Activity startActivityForResult(Intent intent,int requestCode)步骤：---requestCode--0--用此来做个标记，要求大于等于0

1）在源Activity中使用startActivityForResult()方法启动目标Activity

2）在目标Activity中使用setResult()方法设置返回值，并调用finish()方法结束目标Activity

3）在源Activity中重写onActivityResult()方法，获得从目标Activity中返回的值

源Activity代码：

public class MainActivity extends Activity {	private Button button;	private void setupView() {		button = (Button) findViewById(R.id.button);		button.setText("启动TargetActivity");	}		public void doClick(View v){		//启动目标Activity		Intent intent = new Intent(this,TargetActivity.class);		intent.putExtra("name", "zhangsan");//		startActivity(intent);		startActivityForResult(intent, 0);	}	/** Called when the activity is first created. */	@Override	public void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);		setupView();	}		@Override	protected void onActivityResult(int requestCode, int resultCode, Intent data) {		// TODO Auto-generated method stub//		super.onActivityResult(requestCode, resultCode, data);		switch (resultCode) {		case RESULT_CANCELED:			Toast.makeText(this, "未正确返回结果.", Toast.LENGTH_LONG).show();			break;		case RESULT_OK:			int age = data.getIntExtra("age", -1);			if(age!=-1){				Toast.makeText(this, "返回的年龄是：" + age, Toast.LENGTH_LONG).show();			}			break;		}	}}

目标Activity代码：

public class TargetActivity extends Activity {	private Button button;	private String name;	private void setupView(){		button = (Button)findViewById(R.id.button);		button.setText("返回");	}		public void doClick(View v){		//判断姓名，根据姓名获取对应的年龄		int age = -1;		if("zhangsan".equals(name)){			age = 19;		}else if("lisi".equals(name)){			age = 20;		}else if("wangwu".equals(name)){			age = 30;		}else{			age = 18;		}				//创建intent对象，设置年龄为附加参数		Intent intent = new Intent();		intent.putExtra("age", age);				//设置返回值，将intent对象作为数据返回到源Activity		setResult(RESULT_OK, intent);		finish();	}		@Override	protected void onCreate(Bundle savedInstanceState) {		// TODO Auto-generated method stub		super.onCreate(savedInstanceState);		setContentView(R.layout.main);		setupView();//初始化界面				//获取源Activity传递过来的姓名信息		name = getIntent().getStringExtra("name");		//如果未正确获得姓名，则返回RESULT_CALCELED		if(name==null){			setResult(RESULT_CANCELED);			finish();		}	}}

1楼the_fire昨天 23:07

真是个勤快人呀，加油，加油

Re: guomeijuan916昨天 23:35

回复the_firen额，好滴好滴....嘻嘻