1Activity實(shí)現(xiàn)頁面跳轉(zhuǎn)

Activity實(shí)現(xiàn)頁面跳轉(zhuǎn)一、Intent簡介2Intent是一個(gè)將要執(zhí)行的動作的抽象的描述，解決Android應(yīng)用的各項(xiàng)組件之間的通訊，Intent負(fù)責(zé)對應(yīng)用中一次操作的動作、動作涉及數(shù)據(jù)、附加數(shù)據(jù)進(jìn)行描述，Android則根據(jù)此Intent的描述，負(fù)責(zé)找到對應(yīng)的組件，將Intent傳遞給調(diào)用的組件，并完成組件的調(diào)用。intent主要用來啟動activity或者service(并攜帶需要傳遞的參數(shù)信息)。二、案例3二、案例4<EditText

android:id="@+id/username"

android:hint="請輸入用戶名"

android:layout_width="match_parent"

android:layout_height="wrap_content"/>

<EditText

android:id="@+id/pwd"

android:hint="請輸入密碼"

android:inputType="textPassword"

android:layout_width="match_parent"

android:layout_height="wrap_content"/>

<Button

android:id="@+id/login"

android:text="登錄"

android:layout_width="match_parent"

android:layout_height="wrap_content"/>二、案例5<LinearLayoutxmlns:android="/apk/res/android"

android:orientation="vertical"android:layout_width="match_parent"

android:layout_height="match_parent"

android:gravity="center">

<TextView

android:text="主頁面"

android:textSize="30dp"

android:layout_width="wrap_content"

android:layout_height="wrap_content"/>

</LinearLayout>二、案例6publicclassLoginActivityextendsActivity{

privateButtonlogin;

privateEditTextusername,pwd;

protectedvoidonCreate(BundlesavedInstanceState){

super.onCreate(savedInstanceState);

setContentView(R.layout.login);

initView();

}

privatevoidinitView(){

login=findViewById(R.id.login);

username=findViewById(R.id.username);

pwd=findViewById(R.id.pwd);

login.setOnClickListener(newView.OnClickListener(){

publicvoidonClick(Viewview){

二、案例7

if(username.getText().toString().equals("admin")&&

pwd.getText().toString().equals("123456")){

Intentintent=newIntent(getApplicationContext(),

MainActivity.class);

startActivity(intent);

}else{

Toast.makeText(getApplicationContext(),"用戶名或密碼錯(cuò)誤",

Toast.LENGTH_SHORT).show();

}

}

});

}

}二、案例8publicclassMainActivityextendsAppCompatActivity{

@Override

protectedvoidonCreate(BundlesavedInstanceState){

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

}

}MainActivity代碼二、案例9TitleBar代碼publicclassTitleBarextendsLinearLayout{

publicTitleBar(Contextcontext,AttributeSetattrs){

super(context,attrs);

LayoutInflater.from(getContext()).inflate(R.layout.title_bar,this);

}

}二、案例10修改AndroidManifest.xml的application標(biāo)簽代碼<activityandroid:name=".LoginActivity">

<intent-filter>

<actionandroid:name="ent.action.MAIN"/>

<categoryandro