android input 命令小结

文章出处:http://blog.csdn.net/shift_wwx

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 <string>
       input keyevent <key code number or name>
       input [touchscreen|touchpad] tap <x> <y>
       input [touchscreen|touchpad] swipe <x1> <y1> <x2> <y2>
       input trackball press
       input trackball roll <dx> <dy>

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 <string>");
    System.err.println("       input keyevent <key code number or name>");
    System.err.println("       input [touchscreen|touchpad] tap <x> <y>");
    System.err.println("       input [touchscreen|touchpad] swipe <x1> <y1> <x2> <y2>");
    System.err.println("       input trackball press");
    System.err.println("       input trackball roll <dx> <dy>");
}


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<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 kcm = KeyCharacterMap.load(KeyCharacterMap.VIRTUAL_KEYBOARD);
        KeyEvent[] events = kcm.getEvents(chars);
        for(int i = 0; i < events.length; i++) {
            injectKeyEvent(events[i]);
        }
    }

最终会调用injectKeyEvent函数:

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

这里的 InputManger显然从import中可以得知是:

import android.hardware.input.InputManager;

去framework/base/core/java/android.hardware.input中去查找这个文件,并得知injectInputEvent函数:

    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;
        }
    }

return mIm.injectInputEvent(event, mode);是需要调用service中的接口,然后回去调用native的接口,一直到底层。

具体实现过程,以后会补充上~~

这样,就可以在编辑框中通过input命令输入text,而不需要一个一个去点击。

顺便说一下小技巧:

1. input text text之后,文本框上会出现text字符串,但是实际上想输入test,只需要input keyevent KEYCODE_DEL或者input keyevent 67就可以退格了。

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