// 跳轉到下一個頁面
                startActivity(new Intent(MainActivity.this, ActFinishActivity.class));

 
    @Override
    public void onClick(View view) {
 
        if (view.getId() == R.id.goBack){
            finish();
        }
    }

<activity            android:name=".MainActivity"            android:exported="true"            android:launchMode="singleTask"            >

   Intent intent = new Intent(MainActivity.this, ActFinishActivity.class);                // 棧中存在待跳轉的實例時，重新創(chuàng)建該活動的實例，并且清除原來實例上方所有的實例                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);                // 跳轉到下一個頁面                startActivity(intent);

 Intent intent = new Intent(MainActivity.this, ActFinishActivity.class);

 Intent intent2 = new Intent(); 
 intent2.setClass(MainActivity.this,ActFinishActivity.class);

 Intent intent3 = new Intent();
 ComponentName component = new     ComponentName(MainActivity.this,ActFinishActivity.class);
intent3.setComponent(component);

        <activity
            android:name=".ActFinishActivity"
            android:exported="true"
            >
            <intent-filter>
                <action android:name="android.intent.action.myselfActivity"/>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
 
        </activity>

switch (view.getId()){
 
            case R.id.jump_to_tel:
            {
                Intent intent = new Intent();
                intent.setAction(Intent.ACTION_DIAL);
                Uri uri = Uri.parse("tel:123456789");
                intent.setData(uri);
                startActivity(intent);
            }
                break;
            case R.id.jump_to_sms:
                Intent intent2 = new Intent();
                intent2.setAction(Intent.ACTION_SENDTO);
                // 123456789 為發(fā)送目標
                Uri uri2 = Uri.parse("sms:123456789");
                intent2.setData(uri2);
                startActivity(intent2);
                break;
            // 跳轉我自己的頁面
            case R.id.jump_to_my_self:
 
                Intent intent3 = new Intent();
                intent3.setAction("android.intent.action.myselfActivity");
                intent3.addCategory(Intent.CATEGORY_DEFAULT);
                startActivity(intent3);
                break;
 
            default:
                throw new IllegalStateException("Unexpected value: " + view.getId());
        }

Intent intent = new Intent(MainActivity.this,ActFinishActivity.class);
// 傳遞信息到下個界面 通過bundle 包裝數據
Bundle bundle = new Bundle();
bundle.putString("params","go on my lady");
intent.putExtras(bundle);
startActivity(intent);

//  獲取數據
Bundle bundle = getIntent().getExtras();
String value = bundle.getString("params");
tv.setText(value);
Log.e("Fibonacci", "onCreate: "+value);

package com.example.leonardoday1;
 
import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
 
import androidx.activity.result.ActivityResult;
import androidx.activity.result.ActivityResultCallback;
import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.appcompat.app.AppCompatActivity;
 
import java.net.URI;
 
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
 
    private static final String TAG = "Fibonacci";
    private ActivityResultLauncher<Intent> register;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.send_next_msg).setOnClickListener(this);
        TextView tv = findViewById(R.id.main_tv);
 
        register = registerForActivityResult(new ActivityResultContracts.StartActivityForResult(), new ActivityResultCallback<ActivityResult>() {
            @Override
            public void onActivityResult(ActivityResult result) {
                if (result != null){
                    Intent intent = result.getData();
                    if (intent != null && result.getResultCode() == Activity.RESULT_OK){
                        // 獲取返回的數據
                        Bundle bundle = intent.getExtras();
                        String string = bundle.getString("params");
                        tv.setText(string);
                        Log.e(TAG, "onActivityResult: " + string);
                    }
                }
            }
        });
    }
 
    @Override
    public void onClick(View view) {
 
        switch (view.getId()){
 
            case R.id.send_next_msg:
            {
                Intent intent = new Intent(MainActivity.this,ActFinishActivity.class);
                // 傳遞信息到下個界面 通過bundle 包裝數據
                Bundle bundle = new Bundle();
                bundle.putString("params","go on my lady");
                intent.putExtras(bundle);
                register.launch(intent);
            }
                break;
 
            default:
                throw new IllegalStateException("Unexpected value: " + view.getId());
        }
 
 
    }
}

// 反回信息給上個界面
Intent intent = getIntent();
Bundle bundle = new Bundle();
bundle.putString("params","i have receive your message");
intent.putExtras(bundle);
setResult(Activity.RESULT_OK,intent);
// 返回上個界面
finish();