1、經過顯式意圖來實現Activity間的跳轉java
顯式意圖是指在建立Intent對象時就指定接受者組件android
/** * 下面是經過顯式意圖進行跳轉,即明確寫出要跳轉到SecondActivity.class組件中去 */ Intent intent =new Intent(this,SecondActivity.class); intent.putExtra("account",account); intent.putExtra("password",password); startActivity(intent);
注意:建立Activity時要在manifests裏進行靜態註冊,示例以下:app
<activity android:name=".SecondActivity"> </activity>
以後再要跳轉到的界面接受Intent傳遞的內容ide
//經過getIntent獲取MainActivity傳來的intent Intent intent = getIntent(); String account = intent.getStringExtra("account"); String password = intent.getStringExtra("password");
點擊登陸按鈕this
2、經過隱式意圖來實現Activity間的跳轉spa
隱式意圖就是經過intent過濾器來進行匹配跳轉3d
/** * 下面是通隱式意圖進行跳轉,要在manifests裏添加意圖過濾 */ Intent intent = new Intent(); intent.setAction("com.example.activitydemo.LoginInfo"); intent.addCategory(Intent.CATEGORY_DEFAULT); intent.putExtra("account",account); intent.putExtra("password",password); startActivity(intent);
進行註冊的同時添加intent過濾code
<activity android:name=".SecondActivity"> <intent-filter> <action android:name="com.example.activitydemo.LoginInfo"/> <category android:name="android.intent.category.DEFAULT"/> </intent-filter> </activity>
點擊登陸xml
3、原碼對象
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.activitydemo"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".SecondActivity"> <intent-filter> <action android:name="com.example.activitydemo.LoginInfo"/> <category android:name="android.intent.category.DEFAULT"/> </intent-filter> </activity> </application> </manifest>
MainActivity.java
package com.example.activitydemo; import androidx.appcompat.app.AppCompatActivity; import android.content.Intent; import android.os.Bundle; import android.text.TextUtils; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; public class MainActivity extends AppCompatActivity { private static final String TAG = "MainActivity"; private EditText mAccount; private EditText mPassword; private Button mLogin; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); initListener(); } private void initListener() { mLogin.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //登陸按鈕被點擊了 Log.d(TAG,"Login Click。。。"); handlerLogin(); } }); } private void handlerLogin() { //.trim()用於去空格 String account = mAccount.getText().toString().trim(); if (TextUtils.isEmpty(account)) { Toast.makeText(this,"輸入的帳號爲空",Toast.LENGTH_SHORT).show(); return; } String password = mPassword.getText().toString().trim(); if (TextUtils.isEmpty(password)) { Toast.makeText(this,"輸入的密碼爲空",Toast.LENGTH_SHORT).show();; } //先要建立一個意圖對象,而後經過StartActivity()來實現跳轉 /** * 下面是經過顯式意圖進行跳轉,即明確寫出要跳轉到SecondActivity.class組件中去 */ // Intent intent =new Intent(this,SecondActivity.class); // intent.putExtra("account",account); // intent.putExtra("password",password); // startActivity(intent); /** * 下面是通隱式意圖進行跳轉,要在manifests裏添加意圖過濾 */ Intent intent = new Intent(); intent.setAction("com.example.activitydemo.LoginInfo"); intent.addCategory(Intent.CATEGORY_DEFAULT); intent.putExtra("account",account); intent.putExtra("password",password); startActivity(intent); } private void initView() { mAccount = (EditText) this.findViewById(R.id.account); mPassword = (EditText) this.findViewById(R.id.password); mLogin = (Button) this.findViewById(R.id.login); } }
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity"> <TextView android:layout_width="wrap_content" android:text="登陸" android:textSize="30sp" android:layout_gravity="center" android:layout_height="wrap_content"> </TextView> <TextView android:layout_width="wrap_content" android:text="帳號:" android:textSize="25sp" android:layout_height="wrap_content"> </TextView> <EditText android:id="@+id/account" android:layout_width="match_parent" android:layout_height="wrap_content"> </EditText> <TextView android:layout_width="wrap_content" android:text="密碼:" android:textSize="25sp" android:layout_height="wrap_content"> </TextView> <EditText android:id="@+id/password" android:layout_width="match_parent" android:inputType="textPassword" android:layout_height="wrap_content"> </EditText> <Button android:id="@+id/login" android:layout_width="match_parent" android:text="登陸" android:layout_height="wrap_content"> </Button> </LinearLayout>
SecondActivity.java
package com.example.activitydemo; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.widget.TextView; import androidx.annotation.Nullable; public class SecondActivity extends Activity { @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_second); TextView info =(TextView) this.findViewById(R.id.info); //經過getIntent獲取MainActivity傳來的intent Intent intent = getIntent(); String account = intent.getStringExtra("account"); String password = intent.getStringExtra("password"); info.setText("您的帳號爲:"+account+"您的密碼爲:"+password); } }
activity_second_.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:layout_width="match_parent" android:text="登陸信息以下:" android:layout_marginTop="20dp" android:textSize="20sp" android:layout_height="wrap_content"> </TextView> <TextView android:id="@+id/info" android:layout_width="match_parent" android:textSize="25sp" android:text="" android:layout_height="wrap_content"> </TextView> </LinearLayout>