startActivityForResult的用法和demo

有时候我们需要把A activity提交数据给B activity处理，然后把结果返回给A

这种方式在很多种情况需要用到，比如我应用的程序需要有拍照上传的功能。

一种解决方案是 我的应用程序 〉调用系统相机〉拍照〉关闭系统相机〉返回拍照后的照片到我的应用程序





启动一个ForResult的意图：

Intent intent = new Intent(MainAcitvity.this,

RequestActivity.class);

//发送意图标示为REQUSET=1

startActivityForResult(intent, REQUSET);

B Activity处理数据：

Intent intent=new Intent();

intent.putExtra(KEY_USER_ID, et01.getText().toString());

intent.putExtra(KEY_USER_PASSWORD, et02.getText().toString());

setResult(RESULT_OK, intent);

finish();

那么startActivityForResult如何使用呢：

Java代码


package com.cn.activityresult.demo;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainAcitvity extends Activity {

private Button btn01;
private TextView tv01;
public static final int REQUSET = 1;

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
//requestCode标示请求的标示 resultCode表示有数据
if (requestCode == MainAcitvity.REQUSET && resultCode == RESULT_OK) {
String str = "账号"
+ data.getStringExtra(RequestActivity.KEY_USER_ID) + "\n"
+ "密码"
+ data.getStringExtra(RequestActivity.KEY_USER_PASSWORD);
tv01.setText(str);
}
Toast.makeText(
this,
"requestCode=" + requestCode + ":" + "resultCode=" + resultCode,
Toast.LENGTH_LONG).show();
}

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn01 = (Button) findViewById(R.id.btn01);
tv01 = (TextView) findViewById(R.id.tv01);
btn01.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(MainAcitvity.this,
RequestActivity.class);
//发送意图标示为REQUSET=1
startActivityForResult(intent, REQUSET);
}
});

}
}

Java代码


import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class RequestActivity extends Activity {

private Button btn01;
private EditText et01;
private EditText et02;
public static final String KEY_USER_ID="KEY_USER_ID";
public static final String KEY_USER_PASSWORD="KEY_USER_PASSWORD";

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.request_activity);
btn01=(Button)findViewById(R.id.btn01);
et01=(EditText)findViewById(R.id.et01);
et02=(EditText)findViewById(R.id.et02);

btn01.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent=new Intent();
intent.putExtra(KEY_USER_ID, et01.getText().toString());
intent.putExtra(KEY_USER_PASSWORD, et02.getText().toString());
setResult(RESULT_OK, intent);
finish();
}
});
}
}

ActivityForResultDemo.zip (47.9 KB)
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