文章出处：http://blog.csdn.net/shift_wwx/article/details/11481797

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前言：这一阵子碰到android的input命令，但是在网上搜了半天，并没有很详细的解释，所以，我就自己做个总结，方便以后查找。

input命令对于开发的工程来说很是方便的，连接上串口，就可以通过命令做自己想做的事情，避免了在平台上的一些复杂的操作。

input命令定义在frameworks\base\cmds\input\src\com\android\commands\input目录下。

source code如下：

package com.android.commands.input;import android.hardware.input.InputManager;import android.os.SystemClock;import android.util.Log;import android.view.InputDevice;import android.view.KeyCharacterMap;import android.view.KeyEvent;import android.view.MotionEvent;/** * Command that sends key events to the device, either by their keycode, or by * desired character output. */public class Input {    private static final String TAG = "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];        try {            if (command.equals("text")) {                if (args.length == 2) {                    sendText(args[1]);                    return;                }            } else if (command.equals("keyevent")) {                if (args.length == 2) {                    int keyCode = KeyEvent.keyCodeFromString(args[1]);                    if (keyCode == KeyEvent.KEYCODE_UNKNOWN) {                        keyCode = KeyEvent.keyCodeFromString("KEYCODE_" + args[1]);                    }                    sendKeyEvent(keyCode);                    return;                }            } else if (command.equals("tap")) {                if (args.length == 3) {                    sendTap(InputDevice.SOURCE_TOUCHSCREEN, Float.parseFloat(args[1]), Float.parseFloat(args[2]));                    return;                }            } else if (command.equals("swipe")) {                if (args.length == 5) {                    sendSwipe(InputDevice.SOURCE_TOUCHSCREEN, Float.parseFloat(args[1]), Float.parseFloat(args[2]),                            Float.parseFloat(args[3]), Float.parseFloat(args[4]));                    return;                }            } else if (command.equals("touchscreen") || command.equals("touchpad")) {                // determine input source                int inputSource = InputDevice.SOURCE_TOUCHSCREEN;                if (command.equals("touchpad")) {                    inputSource = InputDevice.SOURCE_TOUCHPAD;                }                // determine subcommand                if (args.length > 1) {                    String subcommand = args[1];                    if (subcommand.equals("tap")) {                        if (args.length == 4) {                            sendTap(inputSource, Float.parseFloat(args[2]),                                    Float.parseFloat(args[3]));                            return;                        }                    } else if (subcommand.equals("swipe")) {                        if (args.length == 6) {                            sendSwipe(inputSource, Float.parseFloat(args[2]),                                    Float.parseFloat(args[3]), Float.parseFloat(args[4]),                                    Float.parseFloat(args[5]));                            return;                        }                    }                }            } else if (command.equals("trackball")) {                // determine subcommand                if (args.length > 1) {                    String subcommand = args[1];                    if (subcommand.equals("press")) {                        sendTap(InputDevice.SOURCE_TRACKBALL, 0.0f, 0.0f);                        return;                    } else if (subcommand.equals("roll")) {                        if (args.length == 4) {                            sendMove(InputDevice.SOURCE_TRACKBALL, Float.parseFloat(args[2]),                                    Float.parseFloat(args[3]));                            return;                        }                    }                }            } else {                System.err.println("Error: Unknown command: " + command);                showUsage();                return;            }        } catch (NumberFormatException ex) {        }        System.err.println("Error: Invalid arguments for command: " + command);        showUsage();    }

这里贴的不是完整的code，如果敢兴趣就可以查看研究。

在串口终端输入input命令就会出现input命令的相关用法，

usage: input ...       input text        input keyevent        input [touchscreen|touchpad] tap         input [touchscreen|touchpad] swipe           input trackball press       input trackball roll  

显示的这部分实现同样在input.java中：

private void showUsage() {    System.err.println("usage: input ...");    System.err.println("       input text ");    System.err.println("       input keyevent ");    System.err.println("       input [touchscreen|touchpad] tap  ");    System.err.println("       input [touchscreen|touchpad] swipe    ");    System.err.println("       input trackball press");    System.err.println("       input trackball roll  ");}

我们这里以input text为例子总结一下：

从上面run的函数中可以得知，针对text是这样处理的：

if (command.equals("text")) {   if (args.length == 2) {       sendText(args[1]);       return;   }}

会调用sendText这个函数：

    private void sendText(String text) {        StringBuffer buff = new StringBuffer(text);        boolean escapeFlag = false;        for (int i=0; i

    private void injectKeyEvent(KeyEvent event) {        Log.i(TAG, "injectKeyEvent: " + event);        InputManager.getInstance().injectInputEvent(event,                InputManager.INJECT_INPUT_EVENT_MODE_WAIT_FOR_FINISH);    }

    public boolean injectInputEvent(InputEvent event, int mode) {        if (event == null) {            throw new IllegalArgumentException("event must not be null");        }        if (mode != INJECT_INPUT_EVENT_MODE_ASYNC                && mode != INJECT_INPUT_EVENT_MODE_WAIT_FOR_FINISH                && mode != INJECT_INPUT_EVENT_MODE_WAIT_FOR_RESULT) {            throw new IllegalArgumentException("mode is invalid");        }        try {            return mIm.injectInputEvent(event, mode);        } catch (RemoteException ex) {            return false;        }    }