在不同Activity之间传递数据的四种常用方法

package mobile.android.transmit.data;public class TransmitDataActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);Button button1=(Button)findViewById(R.id.button1);Button button2=(Button)findViewById(R.id.button2);Button button3=(Button)findViewById(R.id.button3);Button button4=(Button)findViewById(R.id.button4);button1.setOnClickListener(new ButtonListenner());button2.setOnClickListener(new ButtonListenner());button3.setOnClickListener(new ButtonListenner());button4.setOnClickListener(new ButtonListenner());}class ButtonListenner implements OnClickListener{@SuppressLint("NewApi")@Overridepublic void onClick(View view) {Intent intent=null;switch (view.getId()) {case R.id.button1:intent=new Intent(TransmitDataActivity.this,MyActivity1.class);//保存String类型的值intent.putExtra("intent_string", "通过Intent传递的字符串");//保存integer类型的值intent.putExtra("intent_integer", 300);Data data=new Data();data.id=1000;data.name="Android";//保存可序列化的对象intent.putExtra("intent_object", data);//显示用于接收数据的ActivitystartActivity(intent);break;case R.id.button2:intent=new Intent();intent.setClass(TransmitDataActivity.this, MyActivity2.class);//下面的代码为MyActivity2中放入三个静态变量赋值MyActivity2.id=3000;MyActivity2.name="保时捷";MyActivity2.data=new Data();MyActivity2.data.id=5555;MyActivity2.name="Android";startActivity(intent);break;case R.id.button3:intent=new Intent(TransmitDataActivity.this,MyActivity3.class);//获取剪贴板对象（ClipboardManager）ClipboardManager clipboard=(ClipboardManager) getSystemService(Context.CLIPBOARD_SERVICE);//创建Data对象Data clipboardData=new Data();//设置Data对象中字段的值clipboardData.id=6666;clipboardData.name="通过Clipboard传递的数据";//创建字节数组输出流对象，用于将Data对象转换为字节流ByteArrayOutputStream baos=new ByteArrayOutputStream();//用于保存Data对象生成Base64格式的字符串String base64Str="";try {ObjectOutputStream oos=new ObjectOutputStream(baos);//将Data对象写入对象输出流oos.writeObject(clipboardData);//将字节流进行Base64编码base64Str=Base64.encodeToString(baos.toByteArray(), Base64.DEFAULT);oos.close();} catch (IOException e) {e.printStackTrace();}//获取存储文本数据的剪贴板数据对象（ClipData）ClipData clipData=ClipData.newPlainText("data", base64Str);//设置主剪贴板clipboard.setPrimaryClip(clipData);//显示Myactivity3窗口startActivity(intent);break;case R.id.button4://获取MyApp对象MyApp myApp=(MyApp) getApplicationContext();myApp.country="美国";myApp.data.id=1234;myApp.data.name="飞碟";intent=new Intent(TransmitDataActivity.this,MyActivity4.class);startActivity(intent);break;default:break;}}}}

package mobile.android.transmit.data;import java.io.Serializable;public class Data implements Serializable{public int id;public String name;}

public class MyActivity1 extends Activity{@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.myactivity);TextView textView=(TextView)findViewById(R.id.textview);//获得String类型的值String intentString=getIntent().getStringExtra("intent_string");//获得Integer类型的值int intentInteger=getIntent().getExtras().getInt("intent_integer");//获得Data类型的值Data data=(Data) getIntent().getExtras().get("intent_object");StringBuffer sb=new StringBuffer();sb.append("Intent_string:");sb.append(intentString);sb.append("/n");sb.append("intent_integer:");sb.append(intentInteger);sb.append("/n");sb.append("data.id:");sb.append(data.id);sb.append("/n");sb.append("data.name:");sb.append(data.name);sb.append("/n");//在屏幕上输出传递过来的值textView.setText(sb.toString());}}

package mobile.android.transmit.data;public class MyActivity2 extends Activity{public static String name;public static int id;public static Data data;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.myactivity);TextView textView=(TextView)findViewById(R.id.textview);StringBuffer sb=new StringBuffer();sb.append("name:");sb.append(name);sb.append("/n");sb.append("id:");sb.append(id);sb.append("/n");sb.append("data.id:");sb.append(data.id);sb.append("/n");sb.append("data.name:");sb.append(data.name);sb.append("/n");textView.setText(sb.toString());}}

package mobile.android.transmit.data;public class MyActivity3 extends Activity{@SuppressLint("NewApi")@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.myactivity);TextView textView=(TextView)findViewById(R.id.textview);//获取剪贴板对象ClipboardManager clipboardManager=(ClipboardManager) getSystemService(Context.CLIPBOARD_SERVICE);//从剪贴板中获取Base64编码字符串String base64Str=clipboardManager.getPrimaryClip().getItemAt(0).getText().toString();//将Base64编码字符串编码成字节数组byte[] buffer=Base64.decode(base64Str, Base64.DEFAULT);ByteArrayInputStream bais=new ByteArrayInputStream(buffer);try {ObjectInputStream ois=new ObjectInputStream(bais);//将字节流还原成Data对象Data data=(Data) ois.readObject();//将Base64编码原文和Data对象字段值显示在TextView控件中textView.setText(base64Str+"/n/ndata.id:"+data.id+"/ndata.name:"+data.name);} catch (Exception e) {e.printStackTrace();} }}

package mobile.android.transmit.data;import android.app.Activity;import android.os.Bundle;import android.widget.TextView;public class MyActivity4 extends Activity{@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.myactivity);TextView textView=(TextView) findViewById(R.id.textview);MyApp myApp=(MyApp) getApplicationContext();textView.setText("MyApp.country:"+myApp.country+"/nMyApp.data.id:"+myApp.data.id+"/nMyApp.data.name:"+myApp.data.name);}}