02-06Android学习进度报告六

今天学习了关于Android开发中常用的两个知识，即对话框和悬浮框。

首先我学习了对话框的基本使用流程

Step 1：创建AlertDialog.Builder对象；

Step 2：调用setIcon()设置图标，setTitle()或setCustomTitle()设置标题；

Step 3：设置对话框的内容：setMessage()还有其他方法来指定显示的内容；

Step 4：调用setPositive/Negative/NeutralButton()设置：确定，取消，中立按钮；

Step 5：调用create()方法创建这个对象，再调用show()方法将对话框显示出来；

实例代码如下：

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button btn_dialog_one;

    private Button btn_dialog_two;

    private Button btn_dialog_three;

    private Button btn_dialog_four;

    private Context mContext;

    private boolean[] checkItems;

    private AlertDialog alert = null;

    private AlertDialog.Builder builder = null;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        mContext = MainActivity.this;

        bindView();

    }

    private void bindView() {

        btn_dialog_one = (Button) findViewById(R.id.btn_dialog_one);

        btn_dialog_two = (Button) findViewById(R.id.btn_dialog_two);

        btn_dialog_three = (Button) findViewById(R.id.btn_dialog_three);

        btn_dialog_four = (Button) findViewById(R.id.btn_dialog_four);

        btn_dialog_one.setOnClickListener(this);

        btn_dialog_two.setOnClickListener(this);

        btn_dialog_three.setOnClickListener(this);

        btn_dialog_four.setOnClickListener(this);

    }

    @Override

    public void onClick(View v) {

        switch (v.getId()) {

            //普通对话框

            case R.id.btn_dialog_one:

                alert = null;

                builder = new AlertDialog.Builder(mContext);

                alert = builder.setIcon(R.mipmap.ic_icon_fish)

                        .setTitle("系统提示：")

                        .setMessage("这是一个最普通的AlertDialog,\n带有三个按钮，分别是取消，中立和确定")

                        .setNegativeButton("取消", new DialogInterface.OnClickListener() {

                            @Override

                            public void onClick(DialogInterface dialog, int which) {

                                Toast.makeText(mContext, "你点击了取消按钮~", Toast.LENGTH_SHORT).show();

                            }

                        })

                        .setPositiveButton("确定", new DialogInterface.OnClickListener() {

                            @Override

                            public void onClick(DialogInterface dialog, int which) {

                                Toast.makeText(mContext, "你点击了确定按钮~", Toast.LENGTH_SHORT).show();

                            }

                        })

                        .setNeutralButton("中立", new DialogInterface.OnClickListener() {

                            @Override

                            public void onClick(DialogInterface dialog, int which) {

                                Toast.makeText(mContext, "你点击了中立按钮~", Toast.LENGTH_SHORT).show();

                            }

                        }).create();             //创建AlertDialog对象

                alert.show();                    //显示对话框

                break;

            //普通列表对话框

            case R.id.btn_dialog_two:

                final String[] lesson = new String[]{"语文", "数学", "英语", "化学", "生物", "物理", "体育"};

                alert = null;

                builder = new AlertDialog.Builder(mContext);

                alert = builder.setIcon(R.mipmap.ic_icon_fish)

                        .setTitle("选择你喜欢的课程")

                        .setItems(lesson, new DialogInterface.OnClickListener() {

                            @Override

                            public void onClick(DialogInterface dialog, int which) {

                                Toast.makeText(getApplicationContext(), "你选择了" + lesson[which], Toast.LENGTH_SHORT).show();

                            }

                        }).create();

                alert.show();

                break;

            //单选列表对话框

            case R.id.btn_dialog_three:

                final String[] fruits = new String[]{"苹果", "雪梨", "香蕉", "葡萄", "西瓜"};

                alert = null;

                builder = new AlertDialog.Builder(mContext);

                alert = builder.setIcon(R.mipmap.ic_icon_fish)

                        .setTitle("选择你喜欢的水果，只能选一个哦~")

                        .setSingleChoiceItems(fruits, 0, new DialogInterface.OnClickListener() {

                            @Override

                            public void onClick(DialogInterface dialog, int which) {

                                Toast.makeText(getApplicationContext(), "你选择了" + fruits[which], Toast.LENGTH_SHORT).show();

                            }

                        }).create();

                alert.show();

                break;

            //多选列表对话框

            case R.id.btn_dialog_four:

                final String[] menu = new String[]{"水煮豆腐", "萝卜牛腩", "酱油鸡", "胡椒猪肚鸡"};

                //定义一个用来记录个列表项状态的boolean数组

                checkItems = new boolean[]{false, false, false, false};

                alert = null;

                builder = new AlertDialog.Builder(mContext);

                alert = builder.setIcon(R.mipmap.ic_icon_fish)

                        .setMultiChoiceItems(menu, checkItems, new DialogInterface.OnMultiChoiceClickListener() {

                            @Override

                            public void onClick(DialogInterface dialog, int which, boolean isChecked) {

                                checkItems[which] = isChecked;

                            }

                        })

                        .setPositiveButton("确定", new DialogInterface.OnClickListener() {

                            @Override

                            public void onClick(DialogInterface dialog, int which) {

                                String result = "";

                                for (int i = 0; i < checkItems.length; i++) {

                                    if (checkItems[i])

                                        result += menu[i] + " ";

                                }

                                Toast.makeText(getApplicationContext(), "客官你点了:" + result, Toast.LENGTH_SHORT).show();

                            }

                        })

                        .create();

                alert.show();

                break;

        }

    }

}

悬浮框的使用的集中常见的方法如下：

public PopupWindow (Context context)
public PopupWindow(View contentView, int width, int height)
public PopupWindow(View contentView)
public PopupWindow(View contentView, int width, int height, boolean focusable)

实例代码如下：

public class MainActivity extends AppCompatActivity {

    private Button btn_show;

    private Context mContext;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        mContext = MainActivity.this;

        btn_show = (Button) findViewById(R.id.btn_show);

        btn_show.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                initPopWindow(v);

            }

        });

    }

    private void initPopWindow(View v) {

        View view = LayoutInflater.from(mContext).inflate(R.layout.item_popup, null, false);

        Button btn_xixi = (Button) view.findViewById(R.id.btn_xixi);

        Button btn_hehe = (Button) view.findViewById(R.id.btn_hehe);

        //1.构造一个PopupWindow，参数依次是加载的View，宽高

        final PopupWindow popWindow = new PopupWindow(view,

                ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, true);

        popWindow.setAnimationStyle(R.anim.anim_pop);  //设置加载动画

        //这些为了点击非PopupWindow区域，PopupWindow会消失的，如果没有下面的

        //代码的话，你会发现，当你把PopupWindow显示出来了，无论你按多少次后退键

        //PopupWindow并不会关闭，而且退不出程序，加上下述代码可以解决这个问题

        popWindow.setTouchable(true);

        popWindow.setTouchInterceptor(new View.OnTouchListener() {

            @Override

            public boolean onTouch(View v, MotionEvent event) {

                return false;

                // 这里如果返回true的话，touch事件将被拦截

                // 拦截后 PopupWindow的onTouchEvent不被调用，这样点击外部区域无法dismiss

            }

        });

        popWindow.setBackgroundDrawable(new ColorDrawable(0x00000000));    //要为popWindow设置一个背景才有效

        //设置popupWindow显示的位置，参数依次是参照View，x轴的偏移量，y轴的偏移量

        popWindow.showAsDropDown(v, 50, 0);

        //设置popupWindow里的按钮的事件

        btn_xixi.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                Toast.makeText(MainActivity.this, "你点击了嘻嘻~", Toast.LENGTH_SHORT).show();

            }

        });

        btn_hehe.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                Toast.makeText(MainActivity.this, "你点击了呵呵~", Toast.LENGTH_SHORT).show();

                popWindow.dismiss();

            }

        });

    }

}

这就是今日学习的知识与内容。

巴特西

02-06Android学习进度报告六

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