渐显启动界面.md

package com.leigo.textswitcherdemo;import android.app.Activity;import android.content.Intent;import android.content.SharedPreferences;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.preference.PreferenceManager;import android.view.View;import android.view.animation.Animation;import android.view.animation.AnimationUtils;import android.widget.ImageView;import android.widget.TextView;import com.loopj.android.http.AsyncHttpClient;import com.loopj.android.http.JsonHttpResponseHandler;import com.nostra13.universalimageloader.core.ImageLoader;import com.nostra13.universalimageloader.core.assist.FailReason;import com.nostra13.universalimageloader.core.listener.ImageLoadingListener;import com.nostra13.universalimageloader.core.listener.SimpleImageLoadingListener;import org.apache.http.Header;import org.json.JSONException;import org.json.JSONObject;/** * Created by Administrator on 2015/3/16. */public class SplashActivity extends Activity {    public Animation splashAnim;    ImageView mImageView;    TextView mText;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_splash);        mImageView = (ImageView) findViewById(R.id.splash);        mText = (TextView) findViewById(R.id.text);        splashAnim = AnimationUtils.loadAnimation(this, R.anim.splash);        splashAnim.setAnimationListener(new Animation.AnimationListener() {            @Override            public void onAnimationStart(Animation animation) {            }            @Override            public void onAnimationEnd(Animation animation) {                Intent intent = new Intent(SplashActivity.this, MainActivity.class);                startActivity(intent);                finish();            }            @Override            public void onAnimationRepeat(Animation animation) {            }        });        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this);        if (!sp.contains("preferences_splash_text")) {            mText.setText(R.string.splash_text);            mImageView.setImageResource(R.drawable.splash);            mImageView.startAnimation(splashAnim);            AsyncHttpClient client = new AsyncHttpClient();            client.get("http://news-at.zhihu.com/api/4/start-image/1080*1776", new JsonHttpResponseHandler() {                @Override                public void onStart() {                    super.onStart();                }                @Override                public void onSuccess(int statusCode, Header[] headers, JSONObject response) {                    super.onSuccess(statusCode, headers, response);                    try {                        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(SplashActivity.this);                        SharedPreferences.Editor editor = sp.edit();                        editor.putString("preferences_splash_text", response.getString("text"));                        editor.putString("preferences_splash_image", response.getString("img"));                        editor.apply();                        ImageLoader.getInstance().loadImage(response.getString("img"), new SimpleImageLoadingListener() {                            @Override                            public void onLoadingStarted(String imageUri, View view) {                            }                            @Override                            public void onLoadingFailed(String imageUri, View view, FailReason failReason) {                            }                            @Override                            public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {                                FileUtils.storeImage(SplashActivity.this, loadedImage);                            }                            @Override                            public void onLoadingCancelled(String imageUri, View view) {                            }                        });                    } catch (JSONException e) {                        e.printStackTrace();                    }                }                @Override                public void onFailure(int statusCode, Header[] headers, String responseString, Throwable throwable) {                    super.onFailure(statusCode, headers, responseString, throwable);                }                @Override                public void onRetry(int retryNo) {                    super.onRetry(retryNo);                }            });        } else {            String text = sp.getString("preferences_splash_text", getString(R.string.splash_text));            mText.setText(text);            Bitmap bitmap = BitmapFactory.decodeFile(FileUtils.getOutputMediaFile(this).getAbsolutePath());            mImageView.setImageBitmap(bitmap);            mImageView.startAnimation(splashAnim);        }    }}

<?xml version="1.0" encoding="utf-8"?><RelativeLayout  android:layout_width="match_parent" android:layout_height="match_parent" xmlns:android="http://schemas.android.com/apk/res/android">    <ImageView  android:id="@+id/splash" android:layout_width="match_parent" android:layout_height="match_parent" android:scaleType="centerCrop" />    <ImageView  android:layout_width="match_parent" android:layout_height="200.0dip" android:src="@drawable/mask" android:layout_alignParentBottom="true" />    <ImageView  android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="50.0dip" android:src="@drawable/splash_logo" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" />    <TextView  android:textSize="@dimen/text_size_12" android:textColor="#ffffffff" android:id="@+id/text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="10.0dip" android:text="@string/splash_text" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:alpha="0.5" /></RelativeLayout>

<?xml version="1.0" encoding="utf-8"?><set  android:shareInterpolator="false" android:zAdjustment="top" android:fillBefore="true" android:fillAfter="true" android:fillEnabled="true" xmlns:android="http://schemas.android.com/apk/res/android">    <scale  android:duration="2500" android:pivotX="50.0%p" android:pivotY="50.0%p" android:fromXScale="1.0" android:toXScale="1.1" android:fromYScale="1.0" android:toYScale="1.1" />    <alpha  android:duration="500" android:startOffset="2000" android:fromAlpha="1.0" android:toAlpha="0.0" /></set>

package com.leigo.textswitcherdemo;import android.content.Context;import android.graphics.Bitmap;import android.os.Environment;import android.util.Log;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;/** * Created by Administrator on 2015/3/19. */public class FileUtils {    private static final String TAG = FileUtils.class.getSimpleName();    public static void storeImage(Context context, Bitmap image) {        File pictureFile = getOutputMediaFile(context);        if (pictureFile == null) {            Log.d(TAG,                    "Error creating media file, check storage permissions: ");// e.getMessage());            return;        }        try {            FileOutputStream fos = new FileOutputStream(pictureFile);            image.compress(Bitmap.CompressFormat.JPEG, 100, fos);            fos.flush();            fos.close();        } catch (FileNotFoundException e) {            Log.d(TAG, "File not found: " + e.getMessage());        } catch (IOException e) {            Log.d(TAG, "Error accessing file: " + e.getMessage());        }    }    /** * Create a File for saving an image or video */    public static File getOutputMediaFile(Context context) {        // To be safe, you should check that the SDCard is mounted        // using Environment.getExternalStorageState() before doing this.        File mediaStorageDir = new File(Environment.getExternalStorageDirectory() + "/Android/data/" + context.getApplicationInfo().packageName + "/files/" + "splash");        // This location works best if you want the created images to be shared        // between applications and persist after your app has been uninstalled.        // Create the storage directory if it does not exist        if (!mediaStorageDir.exists()) {            if (!mediaStorageDir.mkdirs()) {                return null;            }        }        // Create a media file name        File mediaFile = new File(mediaStorageDir.getPath() + File.separator + "splash.jpg");        return mediaFile;    }}

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