FragmentDialogSupport.java

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The file containing the source code shown below is located in the corresponding directory in <sdk>/samples/android-<version>/...

/*
 * Copyright (C) 2011 The Android开源工程
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.supportv4.app;

import com.example.android.supportv4.R;

import android.support.v4.app.DialogFragment;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

public class FragmentDialogSupport extends FragmentActivity {
    int mStackLevel = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_dialog);

        View tv = findViewById(R.id.text);
        ((TextView)tv).setText("Example of displaying dialogs with a DialogFragment.  "
                + "Press the show button below to see the first dialog; pressing "
                + "successive show buttons will display other dialog styles as a "
                + "stack, with dismissing or back going to the previous dialog.");

        // Watch for button clicks.
        Button button = (Button)findViewById(R.id.show);
        button.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                showDialog();
            }
        });

        if (savedInstanceState != null) {
            mStackLevel = savedInstanceState.getInt("level");
        }
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt("level", mStackLevel);
    }

    void showDialog() {
        mStackLevel++;

        // DialogFragment.show() will take care of adding the fragment
        // in a transaction.  We also want to remove any currently showing
        // dialog, so make our own transaction and take care of that here.
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        Fragment prev = getSupportFragmentManager().findFragmentByTag("dialog");
        if (prev != null) {
            ft.remove(prev);
        }
        ft.addToBackStack(null);

        // Create and show the dialog.
        DialogFragment newFragment = MyDialogFragment.newInstance(mStackLevel);
        newFragment.show(ft, "dialog");
    }

    static String getNameForNum(int num) {
        switch ((num-1)%6) {
            case 1: return "STYLE_NO_TITLE";
            case 2: return "STYLE_NO_FRAME";
            case 3: return "STYLE_NO_INPUT (this window can't receive input, so "
                    + "you will need to press the bottom show button)";
            case 4: return "STYLE_NORMAL with dark fullscreen theme";
            case 5: return "STYLE_NORMAL with light theme";
            case 6: return "STYLE_NO_TITLE with light theme";
            case 7: return "STYLE_NO_FRAME with light theme";
            case 8: return "STYLE_NORMAL with light fullscreen theme";
        }
        return "STYLE_NORMAL";
    }

    public static class MyDialogFragment extends DialogFragment {
        int mNum;

        /**
         * Create a new instance of MyDialogFragment, providing "num"
         * as an argument.
         */
        static MyDialogFragment newInstance(int num) {
            MyDialogFragment f = new MyDialogFragment();

            // Supply num input as an argument.
            Bundle args = new Bundle();
            args.putInt("num", num);
            f.setArguments(args);

            return f;
        }

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            mNum = getArguments().getInt("num");

            // Pick a style based on the num.
            int style = DialogFragment.STYLE_NORMAL, theme = 0;
            switch ((mNum-1)%6) {
                case 1: style = DialogFragment.STYLE_NO_TITLE; break;
                case 2: style = DialogFragment.STYLE_NO_FRAME; break;
                case 3: style = DialogFragment.STYLE_NO_INPUT; break;
                case 4: style = DialogFragment.STYLE_NORMAL; break;
                case 5: style = DialogFragment.STYLE_NO_TITLE; break;
                case 6: style = DialogFragment.STYLE_NO_FRAME; break;
                case 7: style = DialogFragment.STYLE_NORMAL; break;
            }
            switch ((mNum-1)%6) {
                case 2: theme = android.R.style.Theme_Panel; break;
                case 4: theme = android.R.style.Theme; break;
                case 5: theme = android.R.style.Theme_Light; break;
                case 6: theme = android.R.style.Theme_Light_Panel; break;
                case 7: theme = android.R.style.Theme_Light; break;
            }
            setStyle(style, theme);
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View v = inflater.inflate(R.layout.fragment_dialog, container, false);
            View tv = v.findViewById(R.id.text);
            ((TextView)tv).setText("Dialog #" + mNum + ": using style "
                    + getNameForNum(mNum));

            // Watch for button clicks.
            Button button = (Button)v.findViewById(R.id.show);
            button.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {
                    // When button is clicked, call up to owning activity.
                    ((FragmentDialogSupport)getActivity()).showDialog();
                }
            });

            return v;
        }
    }
}