Question

我是编程的初学者。我正在尝试创建Meme生成器应用程序。我已经到了一个点，我在GridView中显示一组图像，用户可以点击一个图像，它将把它们带到一个新的活动，用户可以在其中输入顶部和底部文本。

根据我的代码，我将非常感谢您的帮助。

A）我正在尝试在位图中转换相对布局（两个TextView和一个ImageView）。代码是否正确？
- B）当用户点击“创建”按钮时，我想将从相对布局创建的位图发送到FullImage.java活动。是个您认为代码是否正确？
- C）当用户点击“创建”按钮时，目前我的“Binder Transaction＆＃34;失败”。我认为这是因为我正在通过图片。我试图理解并使用如何传递URI但不是
成功的。我试图在SO和其他博客上找到片段，但是不成功。你有可能给我详细的代码吗？（如初学者，我要感恩！）

DetailsActivity.java

package com.jobaka.www.jobaka;

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;

/**
 * Created by Psp on 2016-03-03.
 */
public class DetailsActivity extends AppCompatActivity {

    EditText etTop, etBottom;
    TextView tvTop, tvBottom;
    Button bCreate;

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

        Intent intent = getIntent();
        int id = intent.getIntExtra("id", -1);
        if(id != -1){
            Bitmap bitmap = BitmapFactory.decodeResource(getResources(), id);
            ImageView imageView = (ImageView) findViewById(R.id.image);
            imageView.setImageBitmap(bitmap);
        }else{

        }

        //imageUri = Uri.parse(extras.getString("imageUri"));

        etTop = (EditText) findViewById(R.id.etTop);
        tvTop = (TextView) findViewById(R.id.tvTop);
        etTop.addTextChangedListener(new TextWatcher() {
            public void afterTextChanged(Editable s) {
                tvTop.setText(s.toString());
            }

            public void beforeTextChanged(CharSequence s, int start,int count, int after) {}

            public void onTextChanged(CharSequence s, int start,int before, int count) {}
        });

        etBottom = (EditText) findViewById(R.id.etBottom);
        tvBottom = (TextView) findViewById(R.id.tvBottom);
        etBottom.addTextChangedListener(new TextWatcher() {
            public void afterTextChanged(Editable sb) {
                tvBottom.setText(sb.toString());
            }

            public void beforeTextChanged(CharSequence sb, int start,int count, int after) {}

            public void onTextChanged(CharSequence sb, int start,int before, int count) {}
        });

        bCreate = (Button) findViewById(R.id.bCreate);
        bCreate.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                RelativeLayout v = (RelativeLayout)findViewById(R.id.iFrame);
                Bitmap bitmap = Bitmap.createBitmap(v.getWidth(), v.getHeight(),
                        Bitmap.Config.ARGB_8888);
                Canvas canvas = new Canvas(bitmap);
                view.draw(canvas);

                Intent sendImage = new Intent(DetailsActivity.this, FullImage.class);
                sendImage.putExtra("pic", bitmap);
                startActivity(sendImage);
            }
        });




    }


}

FullImage.java

package com.jobaka.www.jobaka;

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.ImageView;

public class FullImage extends AppCompatActivity {

    ImageView finalimage;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_full_image);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        Intent startingIntent = getIntent();
        String whatYouSent = startingIntent.getStringExtra("pic");
        Bitmap bitmap = BitmapFactory.decodeFile("pic");
        finalimage = (ImageView) findViewById(R.id.ivFull);
        finalimage.setImageBitmap(bitmap);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });
    }

}

Answer 1

在FullImageActivity中，执行此操作以检索位图

   Intent intent = getIntent();
   Bitmap bitmap = (Bitmap) intent.getParcelableExtra("pic");

这是因为android中的位图类实现了parcelable。 http://developer.android.com/reference/android/graphics/Bitmap.html

使用URI将图像通过意图传递到另一个活动

1 个答案: