startActivityForResult Demo

本文介绍如何使用startActivityForResult在两个Android Activity之间进行数据传递。通过示例代码展示了如何从一个Activity启动另一个Activity并接收返回的数据。

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startActivityForResult(Itent intent, int requestCode)用来唤起一个Activity。利用这个方法,前一个Activity1便会有一个等待次Activity2的返回,返回时响应onActivityResult(int requestCode, int resultCode, Intent data)方法。
Demo如下:
第一个activity
package com.kevin.intent;

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 Main extends Activity implements OnClickListener{
private Button btn_transfer;
private EditText et_name;
private int requestCode = 1;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn_transfer = (Button) findViewById(R.id.button1);
et_name = (EditText) findViewById(R.id.editText1);
btn_transfer.setOnClickListener(this);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
System.out.println("requestCode--->" + requestCode);
// resultCode是第二个Activity返回过来的值
switch (resultCode) {
case RESULT_OK:
// 获取Bundle对象
Bundle returnedBundle = data.getExtras();
String returnedName = returnedBundle.getString("name");
et_name.setText(returnedName);
break;

default:
break;
}
}

@Override
public void onClick(View v) {
// 取得et_name的值
String name = et_name.getText().toString();
Bundle bundle = new Bundle();
bundle.putString("name", name);
Intent intent = new Intent();
intent.setClass(this, Activity_1.class);
intent.putExtras(bundle);
// 启动Activity_1
startActivityForResult(intent, requestCode);
}

}

跳转后的activity
package com.kevin.intent;

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;

public class Activity_1 extends Activity implements OnClickListener{
private Button btn_return;
private TextView textView;
private Intent intent;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity1);
intent = this.getIntent();
Bundle bundle = intent.getExtras();
String name = bundle.getString("name");
System.out.println("name --- >" + name);
textView = (TextView) findViewById(R.id.tv_receivedname);

textView.setText("传过来的name值为: " + name);

btn_return = (Button) findViewById(R.id.btn_return);
btn_return.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// 点击返回按钮后,设置返回值
setResult(RESULT_OK, intent);
this.finish();
}
}
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