一.Activity跳转
1.选择Empty Views Activity创建项目
2.创建OtherActivity
3.修改activity_main.xml
android:id="@+id/btnJumpOther" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="跳转到other页面" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.508" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> 4.修改activity_other.xml android:text="Other页面" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/Other" app:layout_constraintTop_toTopOf="parent" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent"/> 5.页面跳转实现 public class MainActivity extends AppCompatActivity { private Button btnJumpOther; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btnJumpOther=findViewById(R.id.btnJumpOther); btnJumpOther.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Intent intent=new Intent(MainActivity.this,OtherActivity.class); startActivity(intent); } }); } } 二.Activity带参跳转 带参跳转则需要使用 Intent 的 putExtra(键,值)方法来放入参数，然后在OtherActivity中使用 getIntent().get类型Extra(键)来取得值 MAinActivity按钮的点击事件 只比前面多了一行代码 intent.putExtra("key", "我是参数"); public class MainActivity extends AppCompatActivity { private Button btnJumpOther; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btnJumpOther=findViewById(R.id.btnJumpOther); btnJumpOther.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Intent intent=new Intent(MainActivity.this,OtherActivity.class); intent.putExtra("key","我是参数"); startActivity(intent); } }); } } OtherActivity中的代码 public class OtherActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_other); TextView Other=findViewById(R.id.Other); Intent intent = getIntent(); String value = intent.getStringExtra("key"); Other.setText(value); } } 三.Activity带参返回 activity_main.xml android:id="@+id/btnJumpMain" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="跳转到other页面" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.508" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> android:text="Hello World" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/receiver" app:layout_constraintTop_toTopOf="parent" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintHorizontal_bias="0.498" app:layout_constraintVertical_bias="0.427"/> activity_other.xml android:id="@+id/btnJumpMain" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="跳转到Main页面" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.508" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> android:text="TextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/receiver" app:layout_constraintTop_toTopOf="parent" android:layout_marginBottom="25dp" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintVertical_bias="0.444" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintHorizontal_bias="0.498"/> MainActivity中的代码 public class MainActivity extends AppCompatActivity { // 定义请求码，不同界面的跳转请求码要求不同，为了识别是哪个控件传递数据 public final static int sendUser = 1; private TextView receiver; private Button btnJumpOther; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btnJumpOther=findViewById(R.id.btnJumpMain); receiver=findViewById(R.id.receiver); btnJumpOther.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Intent intent=new Intent(MainActivity.this,OtherActivity.class); intent.putExtra("key","接收到数据了，现在通知OtherActivity"); // 启动意图(意图，请求码(int)) 请求码最好使用 final static定义 方便识别 startActivityForResult(intent,sendUser); } }); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); // 如果请求码为 sendUser 返回码 为 RESULT_OK RESULT_OK为系统自定义的int值为 -1 if(requestCode==sendUser&&resultCode==RESULT_OK){ // 在TextView中设置返回信息 receiver.setText(data.getStringExtra("key")); } } } OtherActivity中的代码 public class OtherActivity extends AppCompatActivity { private Intent intent; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_other); TextView Other=findViewById(R.id.receiver); intent = getIntent(); String value = intent.getStringExtra("key"); Other.setText(value); Button btnJumpMain = findViewById(R.id.btnJumpMain); btnJumpMain.setOnClickListener(new View.OnClickListener() {