package com.example.crystalball;

import android.support.v4.app.Fragment;

import android.annotation.SuppressLint;

import android.app.Activity;

import android.app.AlertDialog;

import android.content.DialogInterface;

import android.content.DialogInterface.OnClickListener;

import android.content.Intent;

import android.media.AudioManager;

import android.media.SoundPool;

import android.os.Bundle;

import android.util.Log;

import android.view.Gravity;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.ViewGroup;

import android.view.animation.Animation;

import android.view.animation.AnimationUtils;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends Activity {

    private static final String Tag = "MainActivity";

    Button mButton;

    TextView mTextView;

    ImageView mImageView;

    Animation mAnimation;

    Animation mFadein;

    SoundPool mSoundPool;

    int click;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.fragment_main);

        Log.v(Tag, "onCreate()");

        mButton = (Button) findViewById(R.id.button1);

        mTextView = (TextView) findViewById(R.id.textView1);

        mImageView = (ImageView) findViewById(R.id.imageView1);

        mAnimation = AnimationUtils.loadAnimation(this, R.anim.zoomin);

        mFadein = AnimationUtils.loadAnimation(this, R.anim.fadein);

        mSoundPool = new SoundPool(1, AudioManager.STREAM_MUSIC, 0);

        click = mSoundPool.load(this, R.raw.click, 1);

        mButton.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                // TODO Auto-generated method stub

                String answer = "Hello World";

                mTextView.setText(answer);

                mTextView.startAnimation(mFadein);

                mImageView.startAnimation(mAnimation);

                playSound();

                toast("跳转成功");

                startAnotherActivity();

            }

        });

    }

    //通过intent跳转到另一个activity

    private void startAnotherActivity() {

        Intent intent = new Intent(this, SecondActivity.class);

        startActivity(intent);

    }

    private void showDialog() {

        AlertDialog.Builder mBuilder = new AlertDialog.Builder(this);

        mBuilder.setTitle("提示");

        mBuilder.setMessage("确认关闭？");

        mBuilder.setPositiveButton("确认", new OnClickListener() {

            @Override

            public void onClick(DialogInterface dialog, int which) {

                // TODO Auto-generated method stub

                dialog.dismiss();

                MainActivity.this.finish();

            }

        });

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

            @Override

            public void onClick(DialogInterface dialog, int which) {

                // TODO Auto-generated method stub

                dialog.dismiss();

            }

        });

        mBuilder.create().show();

    }

    @Override

    protected void onStart() {

        // TODO Auto-generated method stub

        super.onStart();

        Log.v(Tag, "onStart()");

    }

    @Override

    protected void onRestart() {

        // TODO Auto-generated method stub

        super.onRestart();

        Log.v(Tag, "onRestart()");

    }

    @Override

    protected void onResume() {

        // TODO Auto-generated method stub

        super.onResume();

        Log.v(Tag, "onResume()");

    }

    @Override

    protected void onPause() {

        // TODO Auto-generated method stub

        super.onPause();

        Log.v(Tag, "onPause()");

    }

    @Override

    protected void onStop() {

        // TODO Auto-generated method stub

        super.onStop();

        Log.v(Tag, "onStop()");

    }

    @Override

    protected void onDestroy() {

        // TODO Auto-generated method stub

        super.onDestroy();

        Log.v(Tag, "onDestroy()");

    }

    //按下退出键时

    @Override

    public void onBackPressed() {

        showDialog();

    }

    //播放声音

    private void playSound() {

        mSoundPool.play(click, 1, 1, 0, 0, 1);

    }

    //toast提示

    private void toast(String content) {

        Toast mToast = Toast.makeText(this, content, Toast.LENGTH_SHORT);

        mToast.setGravity(Gravity.CENTER, 0, 0);

        mToast.show();

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }

    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        // Handle action bar item clicks here. The action bar will

        // automatically handle clicks on the Home/Up button, so long

        // as you specify a parent activity in AndroidManifest.xml.

        int id = item.getItemId();

        if (id == R.id.action_settings) {

            return true;

        }

        return super.onOptionsItemSelected(item);

    }

    /**

     * A placeholder fragment containing a simple view.

     */

    public static class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {

        }

        @Override

        public View onCreateView(LayoutInflater inflater, ViewGroup container,

                Bundle savedInstanceState) {

            View rootView = inflater.inflate(R.layout.fragment_main, container,

                    false);

            return rootView;

        }

    }

}

 <?xml version="1.0" encoding="utf-8"?>

 <!-- alpha: 渐变透明度动画效果 -->

 <alpha

     android:fromAlpha="0"

     android:toAlpha="1"

     android:duration="2000"

     xmlns:android="http://schemas.android.com/apk/res/android">

 </alpha>

 <?xml version="1.0" encoding="utf-8"?>

 <!-- scale:     渐变尺寸伸缩动画效果 -->

 <scale

     android:fromXScale="0"

     android:toXScale="1"

     android:fromYScale="0"

     android:toYScale="1"

     android:pivotX="50%"

     android:pivotY="50%"

     android:duration="1000"

     xmlns:android="http://schemas.android.com/apk/res/android">

 </scale>