在不同Activity之间传递数据的四种常用方法
在Android中传递数据的方法非常多，本次介绍4中比较常用的数据传递方法：
1.通过Intent传递数据
2.通过静态变量（static）传递数据
3.通过剪贴板（Clipboard）传递数据
4.通过全局对象传递数据
在TransmitDataActivity.java中
packagemobile.android.transmit.data;
publicclassTransmitDataActivityextendsActivity{
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Buttonbutton1=(Button)findViewById(R.id.button1);
Buttonbutton2=(Button)findViewById(R.id.button2);
Buttonbutton3=(Button)findViewById(R.id.button3);
Buttonbutton4=(Button)findViewById(R.id.button4);
button1.setOnClickListener(newButtonListenner());
button2.setOnClickListener(newButtonListenner());
button3.setOnClickListener(newButtonListenner());
button4.setOnClickListener(newButtonListenner());
}
classButtonListennerimplementsOnClickListener{
@SuppressLint("NewApi")
@Override
publicvoidonClick(Viewview){
Intentintent=null;
switch(view.getId()){
caseR.id.button1:
intent=newIntent(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);
Datadata=newData();
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Activity
startActivity(intent);
break;
caseR.id.button2:
intent=newIntent();
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=newData();
MyActivity2.data.id=5555;
MyActivity2.name="Android";
startActivity(intent);
break;
caseR.id.button3:
intent=newIntent(TransmitDataActivity.this,MyActivity3.class);
//获取剪贴板对象（ClipboardManager）
ClipboardManagerclipboard=(ClipboardManager)getSystemService(Context.CLIPBOARD_SERVICE);
//创建Data对象
DataclipboardData=newData();
//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
ByteArrayOutputStreambaos=newByteArrayOutputStream();
//用于保存Data对象生成Base64格式的字符串
Stringbase64Str="";
try{
ObjectOutputStreamoos=newObjectOutputStream(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(IOExceptione){
e.printStackTrace();
}
//获取存储文本数据的剪贴板数据对象（ClipData）
ClipDataclipData=ClipData.newPlainText("data",base64Str);
//设置主剪贴板
clipboard.setPrimaryClip(clipData);
//显示Myactivity3窗口
startActivity(intent);
break;
caseR.id.button4:
//获取MyApp对象
MyAppmyApp=(MyApp)getApplicationContext();
myApp.country="美国";
myApp.data.id=1234;
myApp.data.name="飞碟";
intent=newIntent(TransmitDataActivity.this,MyActivity4.class);
startActivity(intent);
break;
default:
break;
}
}
}
}
Data类：这个类是可序列化的，也就是实现了java.io.Serializable接口的类。
packagemobile.android.transmit.data;
importjava.io.Serializable;
publicclassDataimplementsSerializable{
publicintid;
publicStringname;
}
在Myactivity1.java中：packagemobile.android.transmit.data;
publicclassMyActivity1extendsActivity{
@Override
protectedvoidonCreate(BundlesavedInstanceState){
//TODOAuto-generatedmethodstub
super.onCreate(savedInstanceState);
setContentView(R.layout.myactivity);
TextViewtextView=(TextView)findViewById(R.id.textview);
//获得String类型的值
StringintentString=getIntent().getStringExtra("intent_string");
//获得Integer类型的值
intintentInteger=getIntent().getExtras().getInt("intent_integer");
//获得Data类型的值
Datadata=(Data)getIntent().getExtras().get("intent_object");
StringBuffersb=newStringBuffer();
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());
}
}
在Myactivity2.java中：
packagemobile.android.transmit.data;
publicclassMyActivity2extendsActivity{
publicstaticStringname;
publicstaticintid;
publicstaticDatadata;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
//TODOAuto-generatedmethodstub
super.onCreate(savedInstanceState);
setContentView(R.layout.myactivity);
TextViewtextView=(TextView)findViewById(R.id.textview);
StringBuffersb=newStringBuffer();
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());
}
}
在Myactivity3中：
packagemobile.android.transmit.data;
publicclassMyActivity3extendsActivity{
@SuppressLint("NewApi")
@Override
protectedvoidonCreate(BundlesavedInstanceState){
//TODOAuto-generatedmethodstub
super.onCreate(savedInstanceState);
setContentView(R.layout.myactivity);
TextViewtextView=(TextView)findViewById(R.id.textview);
//获取剪贴板对象
ClipboardManagerclipboardManager=(ClipboardManager)getSystemService(Context.CLIPBOARD_SERVICE);
//从剪贴板中获取Base64编码字符串
Stringbase64Str=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);
ByteArrayInputStreambais=newByteArrayInputStream(buffer);
try{
ObjectInputStreamois=newObjectInputStream(bais);
//将字节流还原成Data对象
Datadata=(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(Exceptione){
e.printStackTrace();
}
}
}
在Myactivity4.java中：
packagemobile.android.transmit.data;
importandroid.app.Activity;
importandroid.os.Bundle;
importandroid.widget.TextView;
publicclassMyActivity4extendsActivity{
@Override
protectedvoidonCreate(BundlesavedInstanceState){
//TODOAuto-generatedmethodstub
super.onCreate(savedInstanceState);
setContentView(R.layout.myactivity);
TextViewtextView=(TextView)findViewById(R.id.textview);
MyAppmyApp=(MyApp)getApplicationContext();
textView.setText("MyApp.country:"+myApp.country+"\nMyApp.data.id:"+myApp.data.id+"\nMyApp.data.name:"+myApp.data.name);
}
}
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