透过编码方式实现软件的布局...- 视频刻录的简略实现

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▪透过编码方式实现软件的布局通过编码方式实现软件的布局程序运行结果图示：需要注意的是： 1)一个控件只能有一个父元素，如果多次添加 09-02 11:01:34.785: E/AndroidRuntime(23954): java.lang.RuntimeException: Unable to start activit.........

▪ 视频刻录的简略实现视频刻录的简单实现本代码可能在不用的平台上会存在一些问题。。但是主要方法还是一样的 1、main.xml <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/.........

▪ makefile编纂差异 makefile编写差异由于zlib动态库在linux下引用的问题引出了对于简练的makefile的学习。之前通过看网络上的一些文章自己也算简单了解如何编写一个makefile，可总是不那么美观，今天经过辉哥的.........

[1]透过编码方式实现软件的布局

来源: 互联网发布时间: 2014-02-18

通过编码方式实现软件的布局

程序运行结果图示：

需要注意的是：

1)一个控件只能有一个父元素，如果多次添加
09-02 11:01:34.785: E/AndroidRuntime(23954):
java.lang.RuntimeException: Unable to start activity ComponentInfo{cn.itcast.codeui/cn.itcast.codeui.MainActivity}: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.

1、把新建项目时的main.xml文件删除

2、MainActivity

package com.njupt.codeui;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		LayoutParams params = new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT); 
		LayoutParams params1 = new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT);
		LayoutParams params2 = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
		
		LinearLayout linearLayout = new LinearLayout(this);
		linearLayout.setOrientation(LinearLayout.VERTICAL);
		
		TextView tv = new TextView(this);
		tv.setText("请输入你的老婆的姓名");
		linearLayout.addView(tv,params1);
		
		EditText et = new EditText(this);
		et.setText("章泽天");
		linearLayout.addView(et,params1);
		
		Button bt = new Button(this);
		bt.setText("确定");
		linearLayout.addView(bt,params2);
		
		setContentView(linearLayout,params);
		
	}

	@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;
	}

}

[2] 视频刻录的简略实现

来源: 互联网发布时间: 2014-02-18

视频刻录的简单实现

本代码可能在不用的平台上会存在一些问题。。

但是主要方法还是一样的

1、main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
     >

    <SurfaceView android:id="@+id/surfaceview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
         />
    
    <LinearLayout android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        >
        
        <Button android:id="@+id/bt_start"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="开始"
        android:onClick="start"
        android:layout_marginRight="10dp"/>
        <Button android:id="@+id/bt_stop"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="停止"
        android:onClick="stop"
        android:enabled="false"
        android:layout_marginRight="10dp"/>
    </LinearLayout>

</RelativeLayout>

2、MainActivity

package com.njupt.vediorecorder;

import java.io.File;

import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.view.Menu;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {

	private SurfaceView surfaceview;
	private MediaRecorder mr;
    private Button bt_start;
    private Button bt_stop;
    
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		surfaceview = (SurfaceView) findViewById(R.id.surfaceview);
		bt_start = (Button) findViewById(R.id.bt_start);
		bt_stop = (Button) findViewById(R.id.bt_stop);
		
		SurfaceHolder holder = surfaceview.getHolder();
		holder.setFixedSize(176, 144);
		holder.setKeepScreenOn(true);
		holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

	}

	public void start(View v) {

		try {
			mr = new MediaRecorder();
			mr.reset();
			mr.setAudioSource(MediaRecorder.AudioSource.MIC);
			mr.setVideoSource(MediaRecorder.VideoSource.CAMERA);
			mr.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
			mr.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
			mr.setVideoEncoder(MediaRecorder.VideoEncoder.H264);

			File file = new File(Environment.getExternalStorageDirectory(),
					System.currentTimeMillis() + ".3gp");
			mr.setOutputFile(file.getAbsolutePath());

			mr.setPreviewDisplay(surfaceview.getHolder().getSurface());
			mr.prepare();
			
			bt_start.setEnabled(false);
			bt_stop.setEnabled(true);
			mr.start();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public void stop(View v){
		mr.stop();
		
		bt_start.setEnabled(true);
		bt_stop.setEnabled(false);
		mr.release();
	}
	@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;
	}

}

3、AndroidManifest.xml

注册权限

 <uses-permission android:name="android.permission.RECORD_AUDIO"/>//媒体刻录
    <uses-permission android:name="android.permission.CAMERA"/>//拍照
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>//以下两个是读写SD卡
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

横屏显示

 android:screenOrientation="landscape"

[3] makefile编纂差异

来源: 互联网发布时间: 2014-02-18

makefile编写差异

由于zlib动态库在linux下引用的问题引出了对于简练的makefile的学习。之前通过看网络上的一些文章自己也算简单了解如何编写一个makefile，可总是不那么美观，今天经过辉哥的指点，对于makefile做了调整，看下两者之间的差别吧。如果有更好的方法，欢迎指点。

第一次文件如下：

CPP=filehead.cpp xmailuncompress.cpp zlibstrage.cpp compressfactory.cpp md5.cpp
OBJ =  md5.o compressfactory.o filehead.o xmailuncompress.o zlibstrage.o

.PHONY:ALL
ALL: libcompress.a libcompress.so  onlyUncompress mytest

HEAD =  -I./include/

mytest: main.cpp
    g++ main.cpp -g -L. -lcompress   -L./so/ -llogger ${HEAD} -I. -o $@
    rm -f *.o   
    
onlyUncompress:unCompress.cpp
    g++ unCompress.cpp -g -L. -lcompress  -L./so/ -llogger ${HEAD} -I. -o $@

libcompress.a:$(OBJ)
    ar -rc libcompress.a $(OBJ) 
    
libcompress.so:$(CPP)
    g++ -g -fPIC -shared -Wl,-rpath ./so/ -L./so -lz -llogger ${CPP} -o $@  ${HEAD}
    cp libcompress.so ./so/

compressfactory.o:compressfactory.cpp
    g++ -c compressfactory.cpp ${HEAD}

filehead.o:filehead.cpp
    g++  -c filehead.cpp ${HEAD}

xmailuncompress.o:xmailuncompress.cpp
    g++  -c xmailuncompress.cpp ${HEAD}

zlibstrage.o:zlibstrage.cpp
    g++  -c zlibstrage.cpp -L./so -lz ${HEAD}
md5.o:md5.cpp
    g++  -c md5.cpp ${HEAD}

install:
    cp libcompress.so ../libcomp/so/
    cp ./so/*.so ../libcomp/so/
    cp *.h       ../libcomp/include/
    cp ./include/* ../libcomp/include/
    
    cp *.h       ../dfs_api/include/compress/
    cp libcompress.so ../dfs_api/lib/

clean:
    rm -f *.o
    rm -f libcompress.a
    rm -f mytest
    rm -f onlyUncompress
    rm -f libcompress.so

经过修改后的makefile如下：

CPP=main.cpp filehead.cpp xmailuncompress.cpp zlibstrage.cpp compressfactory.cpp md5.cpp

FLAG= -c -g -fPIC -shared

OBJ=filehead.o xmailuncompress.o zlibstrage.o compressfactory.o md5.o

.PHONY:ALL
all:libcompress.a libcompress.so  onlyUncompress mytest

HEAD= -I./include/ -I.

LIB= -L./ -llogger -lz

mytest: main.o
    g++ $< -g -L. -lcompress  ${LIB}  ${HEAD} -I. -o $@
    rm -f *.o   
    
onlyUncompress:unCompress.cpp
    g++ unCompress.cpp -g -L. -lcompress  ${LIB} ${HEAD} -I. -o $@

libcompress.a:$(OBJ)
    ar -rc libcompress.a $(OBJ) 
    
libcompress.so:$(OBJ)
    g++ -g -fPIC -shared -Wl,-rpath ${LIB} $(OBJ) -o $@  ${HEAD}

.cpp.o:
    g++ $(HEAD) $(FLAG) -o $@ $< 

install:
    cp libcompress.so ../libcomp/so/
    cp *.so ../libcomp/so/
    cp *.h       ../libcomp/include/
    cp ./include/* ../libcomp/include/
    
    cp *.h       ../dfs_api/include/compress/
    cp libcompress.so ../dfs_api/lib/

clean:
    rm -f *.o
    rm -f libcompress.a
    rm -f mytest
    rm -f onlyUncompress
    rm -f libcompress.so

两者对比来看是不是后者清晰简练不少

顺带的了解了两个小的知识点：

在makefile中$>代表引用“：”后的内容，，，$@引用“：”前的内容