1 public class MainActivity extends Activity {
2 private Button btn1=null;
3 @Override
4 protected void onCreate(Bundle savedInstanceState) {
5 super.onCreate(savedInstanceState);
6 setContentView(R.layout.activity_main);//加载布局文件
7 btn1=(Button)findViewById(R.id.button1);
8 btn1.setOnClickListener(new View.OnClickListener() {
9
10 @Override
11 public void onClick(View v) {
12 User user=new User("zhangsan", "bj", 23);
13 //将对象转换成字符串
14 String base64=null;
15 //序列化对象
16 ByteArrayOutputStream byteArrayOutputStream=new ByteArrayOutputStream();
17 try {
18 ObjectOutputStream objectOutputStream=new ObjectOutputStream(byteArrayOutputStream);
19 objectOutputStream.writeObject(user);
20 base64=Base64.encodeToString(byteArrayOutputStream.toByteArray(), Base64.DEFAULT);
21 objectOutputStream.close();
22
23 } catch (Exception e) {
24 // TODO: handle exception
25 }
26
27 //数据放入剪切板
28 android.content.ClipboardManager clipboardManager=(android.content.ClipboardManager)getSystemService(Context.CLIPBOARD_SERVICE);
29 clipboardManager.setText(base64);
30 Intent intent=new Intent(MainActivity.this,SecondActivity.class);
31 startActivity(intent);
32 }
33
34 });
35 }
36 }
转下个activity
public class SecondActivity extends Activity {
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.firstr);
textView =(TextView)findViewById(R.id.mss);
//获取剪切板的数据
ClipboardManager clipboardManager=(ClipboardManager)getSystemService(Context.CLIPBOARD_SERVICE);
String message=clipboardManager.getText().toString();
byte[] buffer=Base64.decode(message, Base64.DEFAULT);
ByteArrayInputStream byteArrayInputStream=new ByteArrayInputStream(buffer);
try{
ObjectInputStream objectInputStream=new ObjectInputStream(byteArrayInputStream);
User user=(User)objectInputStream.readObject();
textView.setText(user.toString());
}catch(Exception e){
e.printStackTrace();
}
}
}
2.通过全局变量传递数据
定义全局变量
1 public class AllApplication extends Application {
2 private String username;
3
4
5 public String getUsername() {
6 return username;
7 }
8
9
10 public void setUsername(String username) {
11 this.username = username;
12 }
13
14
15 @Override
16 public void onCreate() {
17 super.onCreate();
18 setUsername("zhangsanas");
19 }
20 }
在清单表中加入全局类名称
1 <application 2 android:name=".AllApplication" 3 android:allowBackup="true" 4 android:icon="@drawable/ic_launcher" 5 android:label="@string/app_name" 6 android:theme="@style/AppTheme" >
主activity
1 public class Main extends Activity {
2 private Button btn1=null;
3 private AllApplication all;
4 @Override
5 protected void onCreate(Bundle savedInstanceState) {
6 super.onCreate(savedInstanceState);
7 setContentView(R.layout.main);
8 btn1=(Button)findViewById(R.id.btn);
9 btn1.setOnClickListener(new View.OnClickListener() {
10
11 @Override
12 public void onClick(View v) {
13 all=(AllApplication)getApplication();
14 all.setUsername("wangwu");
15 Intent intent=new Intent(Main.this,Second.class);
16 startActivity(intent);
17
18 }
19 });
20 }
21 }
转向下个
1 public class Second extends Activity {
2 private AllApplication allApplication;
3 private TextView textView;
4 @Override
5 protected void onCreate(Bundle savedInstanceState) {
6 // TODO Auto-generated method stub
7 super.onCreate(savedInstanceState);
8 setContentView(R.layout.second);
9
10 textView=(TextView)findViewById(R.id.mess);
11 allApplication=(AllApplication)getApplication();
12 textView.setText(allApplication.getUsername());
13
14 }
15
16 }
带返回参数
1 public class Main extends Activity {
2 private Button btn1=null;
3 //定义一个请求的标志量
4 private static final int REQUEST_CODE=1;
5 private EditText one,two,result;
6 @Override
7 protected void onCreate(Bundle savedInstanceState) {
8 super.onCreate(savedInstanceState);
9 setContentView(R.layout.main);
10 one=(EditText)findViewById(R.id.one);
11 two=(EditText)findViewById(R.id.two);
12 result=(EditText)findViewById(R.id.result);
13
14 btn1=(Button)findViewById(R.id.btn);
15 btn1.setOnClickListener(new View.OnClickListener() {
16
17 @Override
18 public void onClick(View v) {
19 Intent intent=new Intent();
20 intent.setClass(Main.this, Second.class);
21 intent.putExtra("a", one.getText().toString());
22 intent.putExtra("b", two.getText().toString());
23 startActivityForResult(intent, REQUEST_CODE);
24
25 }
26 });
27 }
28 @Override
29 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
30 if(resultCode==2){
31 if(requestCode==REQUEST_CODE){
32 result.setText(data.getStringExtra("three"));
33 }
34 }
35 }
36 }
1 public class Second extends Activity {
2 private EditText editText;
3 private TextView teView;
4 private Button bt;
5 @Override
6 protected void onCreate(Bundle savedInstanceState) {
7 // TODO Auto-generated method stub
8 super.onCreate(savedInstanceState);
9 setContentView(R.layout.second);
10 bt=(Button)findViewById(R.id.rebtn);
11 teView=(TextView)findViewById(R.id.mess);
12 editText=(EditText)findViewById(R.id.three);
13 Intent intent=getIntent();
14 String a=intent.getStringExtra("a");
15 String b=intent.getStringExtra("b");
16 teView.setText(a+" + "+b+" = ?");
17 bt.setOnClickListener(new View.OnClickListener() {
18
19 @Override
20 public void onClick(View v) {
21 Intent in=new Intent();
22 in.putExtra("three",editText.getText().toString());
23 setResult(2, in);
24 finish();
25
26 }
27 });
28
29
30
31 }
32
33 }
时间： 2024-10-28 14:37:55