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android介面回撥詳解、簡單例子+複雜例子

package test.ban.com.callback;/**
 * Created by apple on 16/8/30.
 */

import android.annotation.SuppressLint;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

/**
 * 作者:ban on 16/8/30 16:10
 */
public class MainActivity extends Activity implements ImageStateInterface {
    private Button button;
    private TextView mTextView;

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

        /**
         * 例項化控制元件
         */
        //實現方式一 (推薦)
        onLincoln();
        //實現方式二
        //onLincolnTwo();

    }

    /**
     * 實現方式一  這個需要  implements ImageStateInterface 介面
     */
    private void onLincoln() {
        button = (Button) findViewById(R.id.button);
        mTextView = (TextView) findViewById(R.id.tv);
        button.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {

                DownloadImageUtil downloadImageUtil = new DownloadImageUtil();
                /**
                 呼叫StartDownLoad方法,目的是將MainActivity註冊到介面那裡,
                 使介面知道,需要呼叫的是哪個類中的實現該介面的方法。
                 */
                downloadImageUtil.StartDownLoad(MainActivity.this,
                        getApplicationContext());
            }
        });

    }

    @Override
    public void onImageStart() {
        Log.d("lincoln", "onImageStart");
        button.setText("onImageStart");
        mTextView.setText("onImageStart");

    }

    @Override
    public void onImageSuccess(final Bitmap bitmap) {
        Log.d("lincoln", "onImageSuccess");
        runOnUiThread(new Runnable() {

            @SuppressLint("NewApi")
            @Override
            public void run() {
                button.setText("onImageSuccess");
                mTextView.setText("onImageSuccess");
                button.setBackground(new BitmapDrawable(bitmap));
            }
        });
    }

    @Override
    public void onImageFailed() {

    }

    @Override
    public void OnEnd() {
        Toast.makeText(MainActivity.this, "完成啦!!", Toast.LENGTH_SHORT).show();
    }
    /**---------------------實現方式一 結束------------------------*/


    /**
     * --------------------------實現方式二-----------------------------
     */

    private void onLincolnTwo() {
        button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {

                DownloadImageUtil.StartDownLoad(imageInterface,
                        MainActivity.this);
            }
        });

    }

    ImageStateInterface imageInterface = new ImageStateInterface() {

        @Override
        public void onImageStart() {
            Log.d("lincoln", "onImageStart");
            button.setText("onImageStart");
        }

        @Override
        public void onImageSuccess(final Bitmap bitmap) {
            Log.d("lincoln", "onImageSuccess");
            runOnUiThread(new Runnable() {

                @SuppressLint("NewApi")
                @Override
                public void run() {
                    button.setText("onImageSuccess");

                    button.setBackground(new BitmapDrawable(bitmap));
                }
            });
        }

        @Override
        public void onImageFailed() {

        }

        @Override
        public void OnEnd() {
            Toast.makeText(MainActivity.this, "哈哈!!", Toast.LENGTH_SHORT).show();
        }
    };
    /**-----------------------------------------------------------------------------*/

}

原始碼地址:http://download.csdn.net/detail/u010566681/9617131