Android开发之跳转界面

1、通过显示意图跳转界面

第一个Activity(通过Intent携带数据跳转到另一个Activity)

package com.example.activitypractice;import androidx.appcompat.app.AppCompatActivity;import android.content.Context;
 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 Button mLogin;private EditText mAccount;private EditText mPassword;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();mLogin.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Log.d(TAG,"responded to login click");handlerListener();}});}/*** 相应监听事件*/private void handlerListener() {/*** 获取EditText中的值，并将其通过intent传递给SecondActivity，从而实现通信。* 显式意图跳转*/String account = mAccount.getText().toString().trim();if (TextUtils.isEmpty(account)){Toast.makeText(this,"账号用户名不能为空",Toast.LENGTH_SHORT).show();return;}String password = mPassword.getText().toString().trim();if (TextUtils.isEmpty(password)){Toast.makeText(this,"账号密码不能为空",Toast.LENGTH_LONG).show();return;}Intent intent = new Intent();intent.setClass(this,SecondActivity.class);intent.putExtra("account",account);intent.putExtra("password",password);startActivity(intent);}/***初始化组件*/private void initView() {mAccount = findViewById(R.id.main_account);mPassword = findViewById(R.id.main_password);mLogin = findViewById(R.id.main_login);}
 }
 

第二个Activity（格式请自行通过layout布局）

package com.example.activitypractice;import androidx.appcompat.app.AppCompatActivity;import android.content.Intent;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.TextView;/*** 从MainActivity 通过显式意图跳转到SecondActivity*/
 public class SecondActivity extends AppCompatActivity {private TextView mAccount;private TextView mPassword;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_second);init();Intent intent = this.getIntent();if (mAccount != null ){mAccount.setText(intent.getStringExtra("account"));}if (mPassword !=null ){mPassword.setText(intent.getStringExtra("password"));}}private void init() {mAccount = findViewById(R.id.second_account);mPassword = findViewById(R.id.second_password);}
 }
 

结果如下：

2、通过隐式意图跳转界面

第一个Activity

public class MainActivity extends AppCompatActivity {private static final String TAG = "MainActivity";private Button mLogin;private EditText mAccount;private EditText mPassword;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();mLogin.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Log.d(TAG,"responded to login click");handlerListener();}});}/*** 相应监听事件*/private void handlerListener() {/*** 通过隐式意图跳转到ThirdActivity*/Intent intent = new Intent();intent.setAction("LoginInfo");startActivity(intent);}private void initView() {mAccount = findViewById(R.id.main_account);mPassword = findViewById(R.id.main_password);mLogin = findViewById(R.id.main_login);}
 }
 

第二个Activity

public class ThirdActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_third);}
 }
 

需要为第三个Activity在AndroidManifest.xml中添加过滤(ThirdActivity中的Intent-fliter)

3、Intent和Intent过滤器

Intent是一个消息传递对象，主要的基本用例包括三类。

Intent类型

仅为学习过程中的记录，方便自己以后查阅，也希望能帮助到每一位查阅者。其它Intent详情均可参考Android Developer中的详细介绍。
参考文献地址：https://developer.android.google.cn/guide/components/intents-filters?hl=zh-cn