diff options
Diffstat (limited to 'examples/android/helloworld/app/src/main/java/io/grpc/helloworldexample/cpp/HelloworldActivity.java')
-rw-r--r-- | examples/android/helloworld/app/src/main/java/io/grpc/helloworldexample/cpp/HelloworldActivity.java | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/examples/android/helloworld/app/src/main/java/io/grpc/helloworldexample/cpp/HelloworldActivity.java b/examples/android/helloworld/app/src/main/java/io/grpc/helloworldexample/cpp/HelloworldActivity.java new file mode 100644 index 0000000000..ae5c88b208 --- /dev/null +++ b/examples/android/helloworld/app/src/main/java/io/grpc/helloworldexample/cpp/HelloworldActivity.java @@ -0,0 +1,167 @@ +/* + * Copyright 2018, gRPC Authors All rights reserved. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package io.grpc.helloworldexample.cpp; + +import android.content.Context; +import android.os.AsyncTask; +import android.os.Bundle; +import android.support.v7.app.AppCompatActivity; +import android.text.TextUtils; +import android.text.method.ScrollingMovementMethod; +import android.view.View; +import android.view.inputmethod.InputMethodManager; +import android.widget.Button; +import android.widget.EditText; +import android.widget.TextView; +import android.widget.Toast; +import java.lang.ref.WeakReference; + +public class HelloworldActivity extends AppCompatActivity { + + static { + System.loadLibrary("grpc-helloworld"); + } + + private Button sendButton; + private Button serverButton; + private EditText hostEdit; + private EditText portEdit; + private EditText messageEdit; + private EditText serverPortEdit; + private TextView resultText; + private GrpcTask grpcTask; + private RunServerTask runServerTask; + + @Override + protected void onCreate(Bundle savedInstanceState) { + super.onCreate(savedInstanceState); + setContentView(R.layout.activity_helloworld); + sendButton = (Button) findViewById(R.id.send_button); + serverButton = (Button) findViewById(R.id.server_button); + hostEdit = (EditText) findViewById(R.id.host_edit_text); + portEdit = (EditText) findViewById(R.id.port_edit_text); + messageEdit = (EditText) findViewById(R.id.message_edit_text); + serverPortEdit = (EditText) findViewById(R.id.server_port_edit_text); + resultText = (TextView) findViewById(R.id.grpc_response_text); + resultText.setMovementMethod(new ScrollingMovementMethod()); + } + + @Override + protected void onPause() { + super.onPause(); + if (runServerTask != null) { + runServerTask.cancel(true); + runServerTask = null; + serverButton.setText("Start gRPC Server"); + } + if (grpcTask != null) { + grpcTask.cancel(true); + grpcTask = null; + } + } + + public void sendMessage(View view) { + ((InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE)) + .hideSoftInputFromWindow(hostEdit.getWindowToken(), 0); + sendButton.setEnabled(false); + resultText.setText(""); + grpcTask = new GrpcTask(this); + grpcTask.executeOnExecutor( + AsyncTask.THREAD_POOL_EXECUTOR, + hostEdit.getText().toString(), + messageEdit.getText().toString(), + portEdit.getText().toString()); + } + + public void startOrStopServer(View view) { + if (runServerTask != null) { + runServerTask.cancel(true); + runServerTask = null; + serverButton.setText("Start gRPC Server"); + Toast.makeText(this, "Server stopped", Toast.LENGTH_SHORT).show(); + } else { + runServerTask = new RunServerTask(this); + String portStr = serverPortEdit.getText().toString(); + int port = TextUtils.isEmpty(portStr) ? 50051 : Integer.valueOf(portStr); + runServerTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, port); + serverButton.setText("Stop gRPC Server"); + Toast.makeText(this, "Server started on port " + port, Toast.LENGTH_SHORT).show(); + } + } + + private static class RunServerTask extends AsyncTask<Integer, Void, Void> { + private final WeakReference<HelloworldActivity> activityReference; + + private RunServerTask(HelloworldActivity activity) { + this.activityReference = new WeakReference<HelloworldActivity>(activity); + } + + @Override + protected Void doInBackground(Integer... params) { + int port = params[0]; + HelloworldActivity activity = activityReference.get(); + if (activity != null) { + activity.startServer(port); + } + return null; + } + } + + private static class GrpcTask extends AsyncTask<String, Void, String> { + private final WeakReference<HelloworldActivity> activityReference; + + private GrpcTask(HelloworldActivity activity) { + this.activityReference = new WeakReference<HelloworldActivity>(activity); + } + + @Override + protected String doInBackground(String... params) { + String host = params[0]; + String message = params[1]; + String portStr = params[2]; + int port = TextUtils.isEmpty(portStr) ? 50051 : Integer.valueOf(portStr); + return sayHello(host, port, message); + } + + @Override + protected void onPostExecute(String result) { + HelloworldActivity activity = activityReference.get(); + if (activity == null || isCancelled()) { + return; + } + TextView resultText = (TextView) activity.findViewById(R.id.grpc_response_text); + Button sendButton = (Button) activity.findViewById(R.id.send_button); + resultText.setText(result); + sendButton.setEnabled(true); + } + } + + /** + * Invoked by native code to stop server when RunServerTask has been canceled, either by user + * request or upon app moving to background. + */ + public boolean isRunServerTaskCancelled() { + if (runServerTask != null) { + return runServerTask.isCancelled(); + } + return false; + } + + public static native String sayHello(String host, int port, String message); + + public native void startServer(int port); +} |