模拟物理按键

方法1：

//物理按键模拟
Instrumentation inst = new Instrumentation();
inst.sendKeyDownUpSync(KeyEvent.KEYCODE_BACK);

注意：不能再UI进程使用，否则报错"java.lang.RuntimeException: This method can not be called from the main application thread"

方法2：

try {
    Runtime runtime = Runtime.getRuntime();
    runtime.exec("input keyevent " + KeyEvent.KEYCODE_BACK);
} catch (IOException e) {
    e.printStackTrace();
}