在Android 12中使用Futures和AppSearch，需要在项目中添加如下依赖：

dependencies {
    implementation("androidx.concurrent:concurrent-futures:1.1.0")
    implementation("androidx.appsearch:appsearch:1.0.0-beta01")
}

使用Futures的示例代码如下：

import androidx.concurrent.futures.CallbackToFutureAdapter;
import androidx.concurrent.futures.Futures;

import com.google.common.util.concurrent.ListenableFuture;

public class MainActivity extends AppCompatActivity {

    private ExecutorService mExecutor = Executors.newSingleThreadExecutor();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ListenableFuture futureResult = CallbackToFutureAdapter.getFuture(completer -> {
            mExecutor.submit(() -> {
                // do some background processing, and return the result when complete
                String result = "Hello World!";
                completer.set(result);
            });

            // clean up task if it is cancelled before started
            return () -> {
                // do some cleanup, if necessary
            };
        });

        Futures.addCallback(futureResult, new FutureCallback() {
            @Override
            public void onSuccess(@NullableDecl String result) {
                Log.d("FutureResult", result);
            }

            @Override
            public void onFailure(Throwable t) {

            }
        }, mExecutor);
    }
}

使用AppSearch的示例代码如下：

import android.app.assist.AssistContent;
import android.os.Bundle;
import android.util.Log;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appsearch.AppSearchBatchResult;
import androidx.appsearch.AppSearchClient;
import androidx.appsearch.exceptions.AppSearchException;

import java.util.List;

public class MainActivity extends AppCompatActivity {

    private AppSearchClient mAppSearchClient;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mAppSearchClient = AppSearchClient.create(this);

        List phoneList = Phone.getPhones();

        // Inserting all phones into AppSearch index
        mAppSearchClient.put(phoneList).whenComplete((appSearchBatch