首先创建工程
按照提示填入
我使用的是2.3版本，所以Min SDK Version填10
修改/res/layout/下main.xml文件
加入按钮
对应的程序文件如下：
View Code < Button android:layout_height ="wrap_content" android:layout_width ="wrap_content" android:text ="@string/showurl" android:id ="@+id/submit_to_net" ></ Button >
这样就在页面上绘制了一个按钮，然后给按钮添加事件，就是点击后做什么
我的类信息是ActivityUse，这个类继承自Activity
文件中程序如下：
View Code public void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.main); submit_data_tonewactivity(); } private void submit_data_tonewactivity() { Button button_start_browser = (Button) findViewById(R.id.submit_to_net); button_start_browser.setOnClickListener( new OnClickListener() { public void onClick(View v) { Uri myUri = Uri.parse( " http://www.baidu.com " ); Intent openBrowseIntent = new Intent(Intent.ACTION_VIEW, myUri); startActivity(openBrowseIntent); } }); }
看这几句
Uri myUri = Uri.parse("");
Intent openBrowseIntent = new Intent(Intent.ACTION_VIEW, myUri); startActivity(openBrowseIntent);Intent是用于多个Activity之间进行跳转的，Activity可以理解成web开发中的form.
程序调用浏览器，显示网址。
第二个例子，跳转页面并提交数据
用刚才建好的工程
复制一个main.xml并且更名为welcome.xml
配置界面如下，并且在main.xml中加入文本框和登陆按钮
welcome.xml中设置如下，需要对应修改配置属性 并在main.xml中加入如下设置
View Code <? 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:text ="请输入..." android:layout_height ="wrap_content" android:layout_width ="match_parent" android:id ="@+id/logintext" ></ EditText > < Button android:layout_height ="wrap_content" android:layout_width ="wrap_content" android:text ="@string/exit" android:id ="@+id/btnexit" ></ Button > </ LinearLayout >
View Code < EditText android:text ="请输入..." android:layout_height ="wrap_content" android:layout_width ="match_parent" android:id ="@+id/name" ></ EditText > < TextView android:text ="TextView" android:id ="@+id/result" android:layout_width ="fill_parent" android:layout_height ="wrap_content" ></ TextView > < LinearLayout android:layout_height ="wrap_content" android:layout_width ="match_parent" android:id ="@+id/linearLayout1" > < Button android:layout_height ="wrap_content" android:layout_width ="wrap_content" android:text ="@string/showurl" android:id ="@+id/submit_to_net" ></ Button > < Button android:layout_height ="wrap_content" android:layout_width ="wrap_content" android:text ="@string/show_login_name" android:id ="@+id/show_login" ></ Button > < Button android:layout_height ="wrap_content" android:layout_width ="wrap_content" android:text ="@string/show_loginname" android:id ="@+id/submit_to_showloginname" ></ Button > </ LinearLayout >
Activity，需要在AndroidManifest.xml中添加设置
View Code < activity android:name =".Welcome" android:label ="welcome" ></ activity >
Welcome.java类
View Code public class Welcome extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super .onCreate(savedInstanceState); setContentView(R.layout.welcome); Bundle myBundleForGetName = this .getIntent().getExtras(); String name = myBundleForGetName.getString( " key_name " ); final EditText resultName = (EditText) findViewById(R.id.logintext); resultName.setText( " 欢迎你 " + name); click_button(); } private void click_button() { final Button btnExit = (Button) findViewById(R.id.btnexit); btnExit.setOnClickListener(btnexit_listener); } // 返回到main页 private Button.OnClickListener btnexit_listener = new Button.OnClickListener() { public void onClick(View v) { Intent main = new Intent(); main.setClass(Welcome. this , ActivityUse. class ); startActivity(main); } };}
View Code private void submit_data_tonewactivity() { final EditText inName = (EditText) findViewById(R.id.name); final TextView result = (TextView) findViewById(R.id.result); Button button_start_browser = (Button) findViewById(R.id.submit_to_net); Button button_login = (Button) findViewById(R.id.show_login); Button button_showLoginName = (Button) findViewById(R.id.submit_to_showloginname); button_start_browser.setOnClickListener( new OnClickListener() { public void onClick(View v) { Uri myUri = Uri.parse( " http://www.baidu.com " ); Intent openBrowseIntent = new Intent(Intent.ACTION_VIEW, myUri); startActivity(openBrowseIntent); } }); button_login.setOnClickListener( new OnClickListener() { public void onClick(View v) { // 接受数据 Intent openWelcomeActivityIntent = new Intent(); Bundle myBundelForName = new Bundle(); myBundelForName.putString( " key_name " , inName.getText() .toString()); openWelcomeActivityIntent.putExtras(myBundelForName); openWelcomeActivityIntent.setClass(ActivityUse. this , Welcome. class ); startActivity(openWelcomeActivityIntent); } }); button_showLoginName.setOnClickListener( new OnClickListener() { public void onClick(View v) { result.setText(inName.getText() + " 欢迎您进入...... " ); } }); }
注意这几句
// 接受数据
Intent openWelcomeActivityIntent = new Intent(); Bundle myBundelForName = new Bundle(); myBundelForName.putString("key_name", inName.getText() .toString()); openWelcomeActivityIntent.putExtras(myBundelForName); openWelcomeActivityIntent.setClass(ActivityUse.this, Welcome.class); startActivity(openWelcomeActivityIntent);新用到了Bundle，这个是在对个Activity之间传递数据用的，这个例子中将信息放入的方法是putExtras
在接受端，即Welcome.java中
Bundle myBundleForGetName = this.getIntent().getExtras(); String name = myBundleForGetName.getString("key_name"); final EditText resultName = (EditText) findViewById(R.id.logintext); resultName.setText("欢迎你" + name);
接收数据并显示，同样的方法可以传递多个值
页面样例如下：
输入111，点击登陆
跳转后的页面如下：
点击退出可以返回原页面
第三个例子，跳转页面并且得到返回值
还是用刚才的工程
加入login.xml，和Login.java文件
并在AndroidManifest.xml指定
View Code < application android:icon ="@drawable/icon" android:label ="@string/app_name" > < activity android:name =".ActivityUse" android:label ="@string/app_name" > < intent-filter > < action android:name ="android.intent.action.MAIN" /> < category android:name ="android.intent.category.LAUNCHER" /> </ intent-filter > </ activity > < activity android:name =".Welcome" android:label ="welcome" ></ activity > < activity android:name =".Login" android:label ="login" ></ activity > </ application >
添加的登陆页面效果
使用的是TableLayout
login.xml中信息
View Code <? 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" > < TableLayout android:layout_height ="wrap_content" android:layout_width ="match_parent" android:id ="@+id/tableLayout1" > < TableRow android:layout_height ="wrap_content" android:layout_width ="match_parent" android:id ="@+id/tableRow1" > < TextView android:text ="用户名" android:id ="@+id/txtName" android:layout_width ="wrap_content" android:layout_height ="wrap_content" ></ TextView > < EditText android:text ="" android:id ="@+id/tname" android:layout_width ="200px" android:layout_height ="wrap_content" ></ EditText > </ TableRow > < TableRow android:layout_height ="wrap_content" android:layout_width ="match_parent" android:id ="@+id/tableRow1" > < TextView android:text ="密 码" android:id ="@+id/txtPass" android:layout_width ="wrap_content" android:layout_height ="wrap_content" ></ TextView > < EditText android:text ="" android:id ="@+id/tpass" android:layout_width ="200px" android:layout_height ="wrap_content" ></ EditText > </ TableRow > </ TableLayout > < LinearLayout android:layout_height ="wrap_content" android:layout_width ="match_parent" android:id ="@+id/linearLayout1" > < Button android:text ="登陆" android:id ="@+id/btnLogin" android:layout_width ="115px" android:layout_height ="wrap_content" ></ Button > < Button android:text ="取消" android:id ="@+id/btnExit" android:layout_width ="115px" android:layout_height ="wrap_content" ></ Button > </ LinearLayout > </ LinearLayout >
Login.java中信息
View Code public class Login extends Activity { /* * (non-Javadoc) * * @see android.app.Activity#onCreate(android.os.Bundle) */ @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super .onCreate(savedInstanceState); setContentView(R.layout.login); Button btnLogin = (Button) findViewById(R.id.btnLogin); Button btnExit = (Button) findViewById(R.id.btnExit); // 取值 final EditText etName = (EditText) this .findViewById(R.id.tname); final EditText etPass = (EditText) this .findViewById(R.id.tpass); btnLogin.setOnClickListener( new OnClickListener() { public void onClick(View v) { Intent backIntent = new Intent(); Bundle stringBundle = new Bundle(); stringBundle.putString( " loginName " , etName.getText().toString()); stringBundle.putString( " logPass " , etPass.getText().toString()); backIntent.putExtras(stringBundle); setResult(RESULT_OK, backIntent); finish(); } }); btnExit.setOnClickListener( new OnClickListener() { public void onClick(View v) { Intent backIntent = new Intent(); setResult(RESULT_CANCELED, backIntent); finish(); } }); }}
修改main.xml，增加 同时修改ActivityUse.java，并且加入get_returnvalue();函数 接受返回值通过重写
View Code < LinearLayout android:orientation ="vertical" android:layout_height ="wrap_content" android:layout_width ="match_parent" android:id ="@+id/linearLayout2" > < TextView android:text ="返回的内容显示" android:id ="@+id/textViewReturn" android:layout_width ="fill_parent" android:layout_height ="48px" ></ TextView > < Button android:layout_height ="wrap_content" android:layout_width ="wrap_content" android:text ="@string/get_returnvalue" android:id ="@+id/btnReturn" ></ Button > </ LinearLayout >
View Code private void get_returnvalue() { Button btnReturn = (Button) findViewById(R.id.btnReturn); tv = (TextView) this .findViewById(R.id.textViewReturn); btnReturn.setOnClickListener( new OnClickListener() { public void onClick(View v) { Intent toNextInt = new Intent(); toNextInt.setClass(ActivityUse. this , Login. class ); startActivityForResult(toNextInt, REQUESR_ASK); } }); } /* * 通过重载这个方法，得到返回的结果 requestCode 开启请求Intent时对应的请求码 resultCode 返回的结果验证码 data * 返回的Intent * * @see android.app.Activity#onActivityResult(int, int, * android.content.Intent) */ @Override protected void onActivityResult( int requestCode, int resultCode, Intent data) { // TODO Auto-generated method stub super .onActivityResult(requestCode, resultCode, data); if (requestCode == REQUESR_ASK) { if (resultCode == RESULT_CANCELED) { setTitle( " cancel...... " ); } else if (resultCode == RESULT_OK) { showBundle = data.getExtras(); // 得到返回的包 name = showBundle.getString( " loginName " ); pass = showBundle.getString( " logPass " ); tv.setText( " 您的用户名是 " + name + " 您的密码是 " + pass); } } }
需要在ActivityUse中加入，这个是设置请求，REQUESR_ASK可以设定任何值
Intent toNextInt = new Intent();
toNextInt.setClass(ActivityUse.this, Login.class); startActivityForResult(toNextInt, REQUESR_ASK);@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)在login.java端可以取值并返回
Intent backIntent = new Intent();
Bundle stringBundle = new Bundle(); stringBundle.putString("loginName", etName.getText().toString()); stringBundle.putString("logPass", etPass.getText().toString()); backIntent.putExtras(stringBundle); setResult(RESULT_OK, backIntent);Run一下看下结果
点击“得到返回的数据”按钮
输入信息并点击登陆
返回的结果为刚才输入的结果。