[APP] enhance android ui (#441)

apps/android_rpc/README.md

@@ -10,7 +10,7 @@ You will need JDK, [Android NDK](https://developer.android.com/ndk) and an Andro
 
 Before you build the Android application, please refer to [TVM4J Installation Guide](https://github.com/dmlc/tvm/blob/master/jvm/README.md) and install tvm4j-core to your local maven repository. You can find tvm4j dependency declare in `app/build.gradle`. Modify it if it is necessary.
 
-```json
+```
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
     androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {

apps/android_rpc/app/src/main/java/ml/dmlc/tvm/tvmrpc/MainActivity.java

@@ -78,9 +78,11 @@ public class MainActivity extends AppCompatActivity {
       @Override
       public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
         if (isChecked) {
+          enableInputView(false);
           connectProxy();
         } else {
           disconnect();
+          enableInputView(true);
         }
       }
     });
@@ -108,4 +110,13 @@ public class MainActivity extends AppCompatActivity {
     tvmServerWorker.disconnect();
     System.err.println("Disconnected.");
   }
+
+  private void enableInputView(boolean enable) {
+    EditText edProxyAddress = findViewById(R.id.input_address);
+    EditText edProxyPort = findViewById(R.id.input_port);
+    EditText edAppKey = findViewById(R.id.input_key);
+    edProxyAddress.setEnabled(enable);
+    edProxyPort.setEnabled(enable);
+    edAppKey.setEnabled(enable);
+  }
 }

apps/android_rpc/dev_tools/sign_apk.sh

@@ -4,3 +4,4 @@ APK_DIR=$CURR_DIR/../app/build/outputs/apk
 UNSIGNED_APK=$APK_DIR/app-release-unsigned.apk
 SIGNED_APK=$APK_DIR/tvmrpc-release.apk
 jarsigner -verbose -keystore $CURR_DIR/tvmrpc.keystore -signedjar $SIGNED_APK $UNSIGNED_APK 'tvmrpc'
+echo $SIGNED_APK