Android example source code file (Input.java)

This example Android source code file (Input.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, deadojbectexception, input, keycharactermap, keyevent, os, remoteexception, sendkeyevent, stringbuffer, ui, utilities, utils, view

The Input.java Android example source code

/*
 * Copyright (C) 2007 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.commands.input;

import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.SystemClock;
import android.util.Log;
import android.view.IWindowManager;
import android.view.KeyCharacterMap;
import android.view.KeyEvent;

/**
 * Command that sends key events to the device, either by their keycode, or by
 * desired character output.
 */

public class Input {

    /**
     * Command-line entry point.
     *
     * @param args The command-line arguments
     */
    public static void main(String[] args) {
        (new Input()).run(args);
    }

    private void run(String[] args) {
        if (args.length < 1) {
            showUsage();
            return;
        }

        String command = args[0];

        if (command.equals("text")) {
            sendText(args[1]);
        } else if (command.equals("keyevent")) {
            sendKeyEvent(args[1]);
        } else if (command.equals("motionevent")) {
            System.err.println("Error: motionevent not yet supported.");
            return;
        }
        else {
            System.err.println("Error: Unknown command: " + command);
            showUsage();
            return;
        }
    }

    /**
     * Convert the characters of string text into key event's and send to
     * device.
     *
     * @param text is a string of characters you want to input to the device.
     */

    private void sendText(String text) {

        StringBuffer buff = new StringBuffer(text);

        boolean escapeFlag = false;
        for (int i=0; i<buff.length(); i++) {
            if (escapeFlag) {
                escapeFlag = false;
                if (buff.charAt(i) == 's') {
                    buff.setCharAt(i, ' ');
                    buff.deleteCharAt(--i);
                }
            } 
            if (buff.charAt(i) == '%') {
                escapeFlag = true;
            }
        }

        char[] chars = buff.toString().toCharArray();

        KeyCharacterMap mKeyCharacterMap = KeyCharacterMap.
            load(KeyCharacterMap.BUILT_IN_KEYBOARD);

        KeyEvent[] events = mKeyCharacterMap.getEvents(chars);

        for(int i = 0; i < events.length; i++) {
            KeyEvent event = events[i];
            Log.i("SendKeyEvent", Integer.toString(event.getKeyCode()));
            try {
                (IWindowManager.Stub
                    .asInterface(ServiceManager.getService("window")))
                    .injectKeyEvent(event, true);
            } catch (RemoteException e) {
                Log.i("Input", "DeadOjbectException");
            }
        }
    }

    /**
     * Send a single key event.
     *
     * @param event is a string representing the keycode of the key event you
     * want to execute.
     */
    private void sendKeyEvent(String event) {
        int eventCode = Integer.parseInt(event);
        long now = SystemClock.uptimeMillis();
        Log.i("SendKeyEvent", event);
        try {
            KeyEvent down = new KeyEvent(now, now, KeyEvent.ACTION_DOWN, eventCode, 0);
            KeyEvent up = new KeyEvent(now, now, KeyEvent.ACTION_UP, eventCode, 0);
            (IWindowManager.Stub
                .asInterface(ServiceManager.getService("window")))
                .injectKeyEvent(down, true);
            (IWindowManager.Stub
                .asInterface(ServiceManager.getService("window")))
                .injectKeyEvent(up, true);
        } catch (RemoteException e) {
            Log.i("Input", "DeadOjbectException");
        }
    }

    private void sendMotionEvent(long downTime, int action, float x, float y, 
            float pressure, float size) {
    }

    private void showUsage() {
        System.err.println("usage: input [text|keyevent]");
        System.err.println("       input text <string>");
        System.err.println("       input keyevent <event_code>");
    }
}