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startActivityForResult的用法和demo

2024-07-13 02:43:10   219人阅读

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：

 

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);              }          });        }  }

 

 

 

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)下载次数: 142


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