Add activity to show the result of tests.

    <application>

        <uses-library android:name="android.test.runner" />

        <activity android:name="com.android.mtp.TestResultActivity"

                  android:screenOrientation="locked"

                  android:launchMode="singleInstance">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

    <instrumentation android:name="android.test.InstrumentationTestRunner"

    <instrumentation android:name="com.android.mtp.TestResultInstrumentation"

        android:targetPackage="com.android.mtp"

        android:label="Tests for MtpDocumentsProvider" />

/*

 * Copyright (C) 2015 The Android Open Source Project

 *

 * 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 com.android.mtp;

import android.app.Activity;

import android.content.Context;

import android.content.Intent;

import android.os.Bundle;

import android.util.Log;

import android.view.ViewGroup.LayoutParams;

import android.widget.LinearLayout;

import android.widget.TextView;

/**

 * Activity that shows the test results instead of adb while using USB port to connect MTP device.

 */

public class TestResultActivity extends Activity {

    private final static String TAG = "MtpDocumentsProviderTest";

    private TextView mTextView;

    static void show(Context context, String message) {

        Log.d(TAG, message);

        final Intent intent = new Intent(context, TestResultActivity.class);

        intent.putExtra("message", message);

        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

        context.startActivity(intent);

    }

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        final LinearLayout linearLayout = new LinearLayout(this);

        linearLayout.setOrientation(LinearLayout.VERTICAL);

        setContentView(linearLayout);

        mTextView = new TextView(this);

        mTextView.setText(getIntent().getStringExtra("message") + "\n");

        linearLayout.addView(

                mTextView, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

    }

    @Override

    protected void onNewIntent(Intent intent) {

        super.onNewIntent(intent);

        mTextView.setText(mTextView.getText() + intent.getStringExtra("message") + "\n");

    }

}

package com.android.mtp;

import android.os.Bundle;

import android.test.InstrumentationTestRunner;

import junit.framework.AssertionFailedError;

import junit.framework.Test;

import junit.framework.TestListener;

public class TestResultInstrumentation extends InstrumentationTestRunner implements TestListener {

    private boolean mHasError = false;

    @Override

    public void onCreate(Bundle arguments) {

        super.onCreate(arguments);

        addTestListener(this);

    }

    @Override

    public void addError(Test test, Throwable t) {

        mHasError = true;

        show("ERROR", test, t);

    }

    @Override

    public void addFailure(Test test, AssertionFailedError t) {

        mHasError = true;

        show("FAIL", test, t);

    }

    @Override

    public void endTest(Test test) {

        if (!mHasError) {

            show("PASS", test, null);

        }

    }

    @Override

    public void startTest(Test test) {

        mHasError = false;

    }

    private void show(String tag, Test test, Throwable t) {

        TestResultActivity.show(

                getContext(),

                String.format("[%s] %s %s", tag, test.toString(), t != null ? t.getMessage() : ""));

    }

}