Merge pull request #400 from qingtian1993/master

#90 #43 lab4

app/src/main/java/edu/hzuapps/androidworks/homeworks/com1314080901225/Com1314080901225Activity.java

@@ -2,21 +2,101 @@
 
 import android.os.Bundle;
 import android.app.Activity;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Matrix;
+import android.graphics.Paint;
 import android.view.Menu;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.View.OnTouchListener;
+import android.widget.ImageView;
+import android.widget.Toast;
 
 public class Com1314080901225Activity extends Activity {
+	private ImageView iv;
+	private int startX, startY, endX, endY;
+	Bitmap bitSrc, bitCopy;
+	Paint paint;
+	Canvas canvas;
 
 	@Override
 	protected void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 		setContentView(R.layout.activity_com1314080901225);
+		iv = (ImageView) findViewById(R.id.iv);
+		Bitmap bitmap=copyBitmap();
+		iv.setImageBitmap(bitmap);
+		iv.setOnTouchListener(new OnTouchListener() {
+
+			@Override
+			public boolean onTouch(View v, MotionEvent event) {
+				// TODO Auto-generated method stub
+				switch (event.getAction()) {
+				// 手指按下
+				case MotionEvent.ACTION_DOWN:
+					// 获取按下的xy
+					startX = (int) event.getX();
+					startY = (int) event.getY();
+					break;
+
+				// 手指滑动
+				case MotionEvent.ACTION_MOVE:
+					endX = (int) event.getX();
+					endY = (int) event.getY();
+					canvas.drawLine(startX, startY, endX, endY, paint);
+					iv.setImageBitmap(bitCopy);
+
+					// 改变画笔再次的落点
+					startX = endX;
+					startY = endY;
+					break;
+
+				// 手指离开
+				case MotionEvent.ACTION_UP:
+
+					break;
+
+				}
+				return true;
+			}
+		});
 	}
 
-	@Override
-	public boolean onCreateOptionsMenu(Menu menu) {
-		// Inflate the menu; this adds items to the action bar if it is present.
-		getMenuInflater().inflate(R.menu.com1314080901225, menu);
-		return true;
+	// 创建可编辑副本
+	public Bitmap copyBitmap() {
+		bitSrc = BitmapFactory.decodeResource(getResources(), R.drawable.bg);
+		bitCopy = Bitmap.createBitmap(bitSrc.getWidth(), bitSrc.getHeight(),
+				bitSrc.getConfig());
+		paint = new Paint();
+		canvas = new Canvas(bitCopy);
+		canvas.drawBitmap(bitSrc, new Matrix(), paint);
+		return bitCopy;
 	}
 
+	// 红色画笔
+	public void red(View v) {
+		paint.setColor(Color.RED);
+		Toast.makeText(getApplicationContext(), "你选择了红色", 0).show();
+	}
+
+	// 黑色画笔
+	public void black(View v) {
+		paint.setColor(Color.BLACK);
+		Toast.makeText(getApplicationContext(), "你选择了黑色", 0).show();
+	}
+
+	// 画笔加粗
+	public void brush(View v) {
+		paint.setStrokeWidth(9);
+		Toast.makeText(getApplicationContext(), "画笔变粗了", 0).show();
+	}
+
+	//保存图片到sd卡
+	public void save(View v){
+		//保存图片到sd卡
+		//Toast.makeText(getApplicationContext(), "保存图片", 0).show();
+	}
 }

app/src/main/res/layout/activity_com1314080901225.xml

@@ -1,18 +1,57 @@
-<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:paddingBottom="@dimen/activity_vertical_margin"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
-    tools:context=".Com1314080901225Activity" >
+    tools:context=".Com1314080901225Activity" 
+    android:orientation="vertical"
+    >
 
     <ImageView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
+        android:id="@+id/iv"
+        android:layout_width="300dp"
+        android:layout_height="300dp"
 		android:layout_centerInParent="true"
-		android:src="@drawable/c"     
+		android:src="@drawable/bg"     
         />
+
+    <LinearLayout 
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal"
+        android:layout_gravity="center"
+        >
+        <Button 
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="红色"
+          	android:onClick="red"
+
+            />
+          <Button 
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:onClick="black"
+            android:text="黑色"
+            />
+            <Button 
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:onClick="brush"
+            android:text="加粗"
+            />
+              <Button 
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:onClick="save"
+            android:text="保存"
+            />
+
+
+
+    </LinearLayout>
 
-</RelativeLayout>
+</LinearLayout>