Button blue = (Button) findViewById(R.id.blueButton);
        Button green = (Button) findViewById(R.id.greenButton);
        Button red = (Button) findViewById(R.id.redButton);
        Button alertBtn = (Button) findViewById(R.id.alertDialogButton);
        Button progressBtn = (Button) findViewById(R.id
 
.progressDialogButton);

        //設定觸發事件

        View.OnClickListener myOnClickListener = new View.OnClickListener(){
        public void onClick(View v){
            switch (v.getId()) {
            //更改導航欄顏色
            case R.id.blueButton:
                Log.d(TAG, "blue btn is clicked");
                getWindow().setNavigationBarColor
 
(getResources().getColor(R.color.blue));break;
            case R.id.redButton:
                Log.d(TAG, "red btn is clicked");
                getWindow().setNavigationBarColor(getResources().getColor(R.color.red));break;
            case R.id.greenButton:
                Log.d(TAG, "green btn is clicked"
 
);
2                getWindow().setNavigationBarColor(getResources().getColor(R.color.green));break;
            case R.id.alertDialogButton:
                //彈出提示框
                Log.d(TAG, "alertBtn is clicked");
                AlertDialog.Builder alertDialog = new AlertDialog.Builder(MainActivity.this);

            }
        }
    };
        blue.setOnClickListener(myOnClickListener);
        green.setOnClickListener(myOnClickListener);
        red.setOnClickListener(myOnClickListener);
        alertBtn.setOnClickListener(myOnClickListener);