Android Activity之间跳转相互传值

Intent用法实例:

1.无参数Activity跳转

Intent it = new Intent(Activity.Main.this, Activity2.class);
startActivity(it);

2.向下一个Activity传递数据（使用Bundle和Intent.putExtras）

Intent it = new Intent(Activity.Main.this, Activity2.class);
Bundle bundle=new Bundle();
bundle.putString("name", "This is from MainActivity!");
it.putExtras(bundle); // it.putExtra(“test”, "shuju”);
startActivityForResult(intent, 0);

对于数据的获取可以采用：

Bundle bundle = getIntent().getExtras();
String name = bundle.getString("name");

AndroidManifest.xml配置文件:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="iaiai.test" android:versionCode="1" android:versionName="1.0">
  <uses-sdk android:minSdkVersion="8" />

  <application android:icon="@drawable/icon" android:label="@string/app_name">
    <activity android:name=".MyList" android:label="@string/contact_title">
      <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
      </intent-filter>
    </activity>
    <activity android:name=".TestWidget" android:label="@string/contact_title"></activity>
  </application>
  <uses-permission android:name="android.permission.READ_CONTACTS" />
  <!-- 在SD卡中创建文件与删除文件权限 -->
  <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
  <!-- 往SD卡中写入数据权限 -->
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
</manifest>

[color=red]*此文件要注意一个地方就是写的所有Activity类必须要在此配置文件中配置activity，如果不配置则跳转会报错。[/color]

main.xml布局文件:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical" android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <EditText android:id="@+id/et" android:layout_width="fill_parent"
    android:layout_height="wrap_content" />
  <Button android:id="@+id/bt" android:layout_width="fill_parent"
    android:layout_height="wrap_content" android:text="@string/btn_next"></Button>
</LinearLayout>

list_items.xml布局文件:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical" android:layout_width="fill_parent"
  android:layout_height="wrap_content" android:id="@+id/myListItem">
  <EditText android:id="@+id/et1" android:layout_width="fill_parent"
    android:layout_height="wrap_content" />
  <Button android:id="@+id/bt1" android:layout_width="fill_parent"
    android:layout_height="wrap_content" android:text="@string/btn_return"></Button>
</LinearLayout>

values/strings.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, TestListView!</string>
    <string name="app_name">TestListView</string>

    <string name="contact_title">Contact</string>

    <string name="btn_next">Next</string>
    <string name="btn_return">Prev</string>
</resources>

values-zh-rCN/strings.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, TestListView!</string>
    <string name="app_name">TestListView</string>

    <string name="contact_title">联系人</string>

    <string name="btn_next">下一步</string>
     <string name="btn_return">返回</string>
</resources>

MyList.java类:

package iaiai.test;

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 MyList extends Activity {

  private EditText editView;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    editView = (EditText) findViewById(R.id.et);

    Button bt = (Button) findViewById(R.id.bt);
    bt.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        Intent intent = new Intent(MyList.this, TestWidget.class);

        Bundle bundle = new Bundle();
        bundle.putString("text", editView.getText().toString());
        intent.putExtras(bundle);

        startActivityForResult(intent, 0);
        // finish(); //这句意思是关闭当前Activity，也就是说点返回键返回不到这个Activity了.
      }
    });
  }

  /**
   * 取到回传的值
   */
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (resultCode) { // resultCode为回传的标记，我在B中回传的是RESULT_OK
    case RESULT_OK:
      Bundle b = data.getExtras(); // data为B中回传的Intent
      editView.setText(b.getString("text"));// 回传的值
      break;
    default:
      break;
    }
  }

}

TestWidget.java类:

package iaiai.test;

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 TestWidget extends Activity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.list_items);

    Bundle bundle = getIntent().getExtras();

    final EditText editView = (EditText) findViewById(R.id.et1);
    editView.setText(bundle.getString("text"));

    Button bt = (Button) findViewById(R.id.bt1);
    bt.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        Intent intent = new Intent(TestWidget.this, MyList.class);

        Bundle bundle = new Bundle();
        bundle.putString("text", editView.getText().toString());
        intent.putExtras(bundle);

        setResult(RESULT_OK, intent);
        finish(); // 这句意思是关闭当前Activity，也就是说点返回键返回不到这个Activity了.
      }
    });
  }

}

以下是运行结果:

[img]http://dl.iteye.com/upload/attachment/491020/d2cf9b7f-6c9e-33cb-9eab-a1bf3fb2165d.jpg[/img]

[img]http://dl.iteye.com/upload/attachment/491022/db8498f3-dd18-33c6-9456-c76c0b99225d.jpg[/img]

[img]http://dl.iteye.com/upload/attachment/491024/0f85887b-ff8b-372a-95c4-7796bafc023c.jpg[/img]